Module: Ragweed::Blocks

Extended by:
Rasm
Includes:
Rasm
Defined in:
lib/ragweed/blocks.rb

Constant Summary

Constants included from Rasm

Rasm::Addl, Rasm::Eax, Rasm::Ebp, Rasm::Ebx, Rasm::Ecx, Rasm::Edi, Rasm::Edx, Rasm::Esi, Rasm::Esp, Rasm::LIBPATH, Rasm::PATH, Rasm::Subl, Rasm::VERSION

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Rasm

eax, ebp, ebx, ecx, edi, edx, esi, esp, libpath, method_missing, path, require_all_libs_relative_to, require_utils, version

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Ragweed::Rasm

Class Method Details

.remote_trampoline(argc, opts = {}) ⇒ Object 



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# File 'lib/ragweed/blocks.rb', line 10

def remote_trampoline(argc, opts={})
  i = Ragweed::Rasm::Subprogram.new

  # drop directly to debugger
  i << Int(3) if opts[:debug]

  # psuedo-frame-pointer
  i.<< Push(esi)
  i.<< Mov(esi, esp)

  # get the thread arg
  i.<< Add(esi, 8)

  # load it
  i.<< Mov(esi, [esi])
  i.<< Push(ebx)
  i.<< Mov(ebx, [esi])
  i.<< Push(ecx)

  # harvest arguments out of the argument buffer
  (0...argc).each do |n|
    i.<< Mov(ecx, [esi+(4+(n*4))])
    i.<< Push(ecx)
  end

  i.<< Call(ebx)

  # stuff return value after args
  i.<< Mov([esi + (4+(argc*4))], eax)
  
  # epilogue
  i.<< Pop(ecx)
  i.<< Pop(ebx)
  i.<< Pop(esi)
  i.<< Ret() # i think this is an artifact of my IRB, TODO clean up
end

Instance Method Details

#event_pair_stub(opts = {}) ⇒ Object 



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# File 'lib/ragweed/blocks.rb', line 48

def event_pair_stub(opts={})
  i = Ragweed::Rasm::Subprogram.new

  i << Int(3) if opts[:debug]

  i.<< Push(ebp)
  i.<< Mov(ebp, esp)
  i.<< Sub(esp, 12)

  i.<< Push(esi)
  i.<< Mov(esi, [ebp+8])

  i.<< Push(eax)
  i.<< Push(ebx)
  i.<< Push(edx)
  
  # OpenProcess
  i.<< Mov(ebx, [esi]) # function ptr
  i.<< Mov(eax, [esi+24]) 
  i.<< Push(eax)
  i.<< Xor(eax, eax)
  i.<< Push(eax)
  i.<< Or(eax, 0x1F0FFF)
  i.<< Push(eax)
  i.<< Call(ebx)
  i.<< Mov([ebp-4], eax)
  
  # DuplicateHandle
  i.<< Mov(ebx, [esi+4]) # function ptr
  (1..2).each do |which|
    i.<< Push(2) # flags
    i.<< Push(0) # dunno
    i.<< Push(0) # dunno 
    i.<< Mov(edx, ebp)    # my LEA encoding is broken
    i.<< Sub(edx, 8+(4*(which-1))) 
    i.<< Lea(eax, [edx])
    i.<< Push(eax) # handle out-arg
    i.<< Xor(eax, eax)
    i.<< Not(eax)
    i.<< Push(eax) # target process
    i.<< Mov(ecx, esi)
    i.<< Add(ecx, (20 + (4 * which)))
    i.<< Push([ecx])
    i.<< Push([ebp-4]) # target process handle
    i.<< Call(ebx)
  end

  # ResetHandle
  i.<< Mov(ebx, [esi+8]) # function ptr
  (0..1).each do |which|
    i.<< Push([ebp-(8+(4*which))])
    i.<< Call(ebx)
  end

  # SignalHandle
  i.<< Mov(ebx, [esi+12]) # function ptr
  i.<< Push([ebp-8])
  i.<< Call(ebx)

  # WaitForSingleObject
  i.<< Mov(ebx, [esi+16])
  i.<< Xor(eax, eax)
  i.<< Not(eax)
  i.<< Push(eax)
  i.<< Push([ebp-12])
  i.<< Call(ebx)
 
  # All done!

  i.<< Pop(edx)
  i.<< Pop(ebx)
  i.<< Pop(eax)
  i.<< Pop(ecx)
  i.<< Pop(esi)
  i.<< Add(esp, 12)
  i.<< Pop(ebp)
  i.<< Ret()
end