xp sp2/sp3 win7 测试过，其它没去测
// author: failed
#include <stdio.h>
int main()
{
LoadLibrary(_T("user32.dll"));
_asm{
nop
nop
nop
nop
nop
CLD ; clear flag DF
;store hash
push 0x1e380a6a ;hash of MessageBoxA
push 0x4fd18963 ;hash of ExitProcess
push 0x0c917432 ;hash of LoadLibraryA
mov esi,esp ; esi = addr of first function hash
lea edi,[esi-0xc] ; edi = addr to start saving function address
; make some stack space
xor ebx,ebx
mov bh, 0x04
sub esp, ebx
; push a pointer to "user32" onto stack
mov bx, 0x3233 ; rest of ebx is null
push ebx
push 0x72657375
push esp
xor edx,edx
; find base addr of kernel32.dll
mov ebx, fs:[edx + 0x30] ; ebx = PEB
mov ecx, [ebx + 0x0c] ; ecx = PEB_LDR_DATA
mov ecx, [ecx + 0x0c] ; ecx = [PEB_LDR_DATA + 0x0C] = LDR_MODULE InLoadOrder[0] (process)
mov ecx, [ecx] ; ecx = InLoadOrder[1] (ntdll)
mov ecx, [ecx] ; ecx = InLoadOrder[2] (kernel32)
mov ebp, [ecx + 0x18] ; ebp = [InLoadOrder[2] + 0x18] = kernel32 DllBase
find_lib_functions:
lodsd ; load next hash into al and increment esi
cmp eax, 0x1e380a6a ; hash of MessageBoxA - trigger
; LoadLibrary("user32")
jne find_functions
xchg eax, ebp ; save current hash
call [edi - 0x8] ; LoadLibraryA
xchg eax, ebp ; restore current hash, and update ebp
; with base address of user32.dll
find_functions:
pushad ; preserve registers
mov eax, [ebp + 0x3c] ; eax = start of PE header
mov ecx, [ebp + eax + 0x78] ; ecx = relative offset of export table
add ecx, ebp ; ecx = absolute addr of export table
mov ebx, [ecx + 0x20] ; ebx = relative offset of names table
add ebx, ebp ; ebx = absolute addr of names table
xor edi, edi ; edi will count through the functions
next_function_loop:
inc edi ; increment function counter
mov esi, [ebx + edi * 4] ; esi = relative offset of current function name
add esi, ebp ; esi = absolute addr of current function name
cdq ; dl will hold hash (we know eax is small)
hash_loop:
movsx eax, byte ptr[esi]
cmp al,ah
jz compare_hash
ror edx,7
add edx,eax
inc esi
jmp hash_loop
compare_hash:
cmp edx, [esp + 0x1c] ; compare to the requested hash (saved on stack from pushad)
jnz next_function_loop
mov ebx, [ecx + 0x24] ; ebx = relative offset of ordinals table
add ebx, ebp ; ebx = absolute addr of ordinals table
mov di, [ebx + 2 * edi] ; di = ordinal number of matched function
mov ebx, [ecx + 0x1c] ; ebx = relative offset of address table
add ebx, ebp ; ebx = absolute addr of address table
add ebp, [ebx + 4 * edi] ; add to ebp (base addr of module) the
; relative offset of matched function
xchg eax, ebp ; move func addr into eax
pop edi ; edi is last onto stack in pushad
stosd ; write function addr to [edi] and increment edi
push edi
popad ; restore registers
; loop until we reach end of last hash
cmp eax,0x1e380a6a
jne find_lib_functions
function_call:
xor ebx,ebx
push ebx // cut string
push 0x78787878 // push "xxxx"
mov eax,esp //load address of failwest
push ebx
push eax
push eax
push ebx
call [edi - 0x04] ; //call MessageboxA
push ebx
call [edi - 0x08] ; // call ExitProcess
nop
nop
nop
nop
}
return 0;
}
char shellcode[]=
"\xFC\x68\x6A\x0A\x38\x1E\x68\x63\x89\xD1\x4F\x68\x32\x74\x91\x0C"
"\x8B\xF4\x8D\x7E\xF4\x33\xDB\xB7\x04\x2B\xE3\x66\xBB\x33\x32\x53"
"\x68\x75\x73\x65\x72\x54\x33\xD2\x64\x8B\x5A\x30\x8B\x4B\x0C\x8B"
"\x49\x0C\x8B\x09\x8B\x09\x8B\x69\x18\xAD\x3D\x6A\x0A\x38\x1E\x75"
"\x05\x95\xFF\x57\xF8\x95\x60\x8B\x45\x3C\x8B\x4C\x05\x78\x03\xCD"
"\x8B\x59\x20\x03\xDD\x33\xFF\x47\x8B\x34\xBB\x03\xF5\x99\x0F\xBE"
"\x06\x3A\xC4\x74\x08\xC1\xCA\x07\x03\xD0\x46\xEB\xF1\x3B\x54\x24"
"\x1C\x75\xE4\x8B\x59\x24\x03\xDD\x66\x8B\x3C\x7B\x8B\x59\x1C\x03"
"\xDD\x03\x2C\xBB\x95\x5F\xAB\x57\x61\x3D\x6A\x0A\x38\x1E\x75\xA9"
"\x33\xDB\x53\x68\x78\x78\x78\x78\x8B\xC4\x53\x50\x50\x53\xFF\x57"
"\xFC\x53\xFF\x57\xF8" // 165 bytes msgbox shellcode for xp/win7
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