88 lines
2.1 KiB
Ruby
88 lines
2.1 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'rex/encoder/alpha2/alpha_upper'
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class Metasploit3 < 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 Uppercase Encoder",
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'Description' => %q{
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Encodes payloads as alphanumeric uppercase 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::AlphanumUpper,
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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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if(datastore['AllowWin32SEH'] and datastore['AllowWin32SEH'].to_s =~ /^(t|y|1)/i)
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buf = 'VTX630WTX638VXH49HHHPVX5AAQQPVX5YYYYP5YYYD5KKYAPTTX638TDDNVDDX4Z4A63861816'
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reg = 'ECX'
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off = 0
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else
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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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else
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reg.upcase!
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end
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buf + Rex::Encoder::Alpha2::AlphaUpper::gen_decoder(reg, off)
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end
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#
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# Configure SEH getpc code on Windows
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#
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def init_platform(platform)
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if(platform.supports?(::Msf::Module::PlatformList.win32))
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datastore['AllowWin32SEH'] = true
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end
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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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return Rex::Encoder::Alpha2::AlphaUpper::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::AlphaUpper::add_terminator()
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end
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end
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