68 lines
1.5 KiB
Ruby
68 lines
1.5 KiB
Ruby
require 'msf/core'
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require 'rex/encoder/alpha2/alpha_mixed'
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module Msf
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module Encoders
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module X86
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class AlphaMixed < Msf::Encoder::Alphanum
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Rank = LowRanking
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def initialize
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super(
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'Name' => "Alpha2 Alphanumeric Mixedcase Encoder",
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'Version' => '$Revision$',
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'Description' => %q{
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Encodes payloads as alphanumeric mixedcase text. This encoder uses
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SkyLined's Alpha2 encoding suite.
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},
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'Author' => [ 'pusscat', 'skylined' ],
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'Arch' => ARCH_X86,
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'License' => BSD_LICENSE,
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'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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'Decoder' =>
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{
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'BlockSize' => 1,
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})
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end
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#
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# Returns the decoder stub that is adjusted for the size of the buffer
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# being encoded.
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#
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def decoder_stub(state)
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reg = datastore['BufferRegister']
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off = (datastore['BufferOffset'] || 0).to_i
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buf = ''
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# We need to create a GetEIP stub for the exploit
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if (not reg)
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res = Rex::Arch::X86.geteip_fpu(state.badchars)
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if (not res)
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raise RuntimeError, "Unable to generate geteip code"
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end
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buf, reg, off = res
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end
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buf + Rex::Encoder::Alpha2::AlphaMixed::gen_decoder(reg, off)
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end
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#
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# Encodes a one byte block with the current index of the length of the
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# payload.
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#
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def encode_block(state, block)
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Rex::Encoder::Alpha2::AlphaMixed::encode_byte(block.unpack('C')[0], state.badchars)
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end
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#
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# Tack on our terminator
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#
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def encode_end(state)
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state.encoded += Rex::Encoder::Alpha2::AlphaMixed::add_terminator()
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end
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end
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end end end
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