2005-05-21 18:27:24 +00:00
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require 'Msf/Core'
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2005-05-18 06:28:12 +00:00
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module Msf
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module Encoders
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module Generic
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module IA32
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class JmpCallAdditive < Msf::Encoder::XorAdditiveFeedback
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def initialize
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super(
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'Name' => 'Jump/Call XOR Additive Feedback',
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'Version' => '$Revision$',
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'Description' => 'Jump/Call XOR Additive Feedback',
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'Author' => 'skape',
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'Arch' => ARCH_IA32,
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'DecoderStub' =>
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"\xfc" + # cld
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"\xbbXORK" + # mov ebx, key
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"\xeb\x0c" + # jmp short 0x14
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"\x5e" + # pop esi
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"\x56" + # push esi
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"\x31\x1e" + # xor [esi], ebx
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"\xad" + # lodsd
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"\x01\xc3" + # add ebx, eax
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"\x85\xc0" + # test eax, eax
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"\x75\xf7" + # jnz 0xa
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"\xc3" + # ret
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"\xe8\xef\xff\xff\xff", # call 0x8
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'DecoderKeyOffset' => 2,
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'DecoderKeySize' => 4,
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'DecoderBlockSize' => 4)
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end
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end
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end end end end
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