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