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Flag: Tornado! Hurricane!

Created: Thursday, September 28 2006 21:54.47 CDT

Modified: Thursday, September 28 2006 22:01.39 CDT

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My GetProcAddress

Author: buguty

# Views: 1913

This func. could only find API's Address by name. -_-!!!

This is source:

typedef void(*MyFunc)(void*); //only use bu me *_^

MyFunc GetProcAddr(char* pFuncName,HMODULE hDll)
{
unsigned long hash;

pExploit RetVanlue;

_asm
{
mov esi,pFuncName
xor ebx,ebx
CmputeHash:
xor eax,eax
lodsb
cmp al,0x0a
jz CmputeHash
cmp al,ah
jz FindStart
ror ebx,7
add ebx,eax
jmp CmputeHash

FindStart:
mov hash,ebx

mov ebx,hDll ;base to eax
mov edi,[ebx+0x3c]
mov edi,[edi+ebx+0x78]
add edi,ebx ;edi==Addr of IMAGE_EXPORT_DIRECTORY

mov edx,[edi+0x20]
push esi
mov esi,dword ptr [edx+ebx]
add esi,ebx ;esi-->names

xor edx,edx ;counter...
dec edx
mov ecx,[edi+0x18] ;Number of Names of Funcs

push ebx

GetHash:
dec ecx
inc edx
xor ebx,ebx

GetHashLoop:
xor eax,eax
lodsb
cmp ah,al
jz FindByHash
ror ebx,7
add ebx,eax
jmp GetHashLoop

FindByHash:
mov eax,hash
cmp eax,ebx
jz HashFind
cmp ecx,0
jnz GetHash
jmp UnFindAndEnd

HashFind:
mov eax,[edi+0x24] ;Get AddressOfNameOrdinals's Address
pop ebx
add eax,ebx
movzx ax,word ptr [eax+edx*2]
mov edx,[edi+0x1c]
add edx,ebx
and eax,0x0ffff
mov eax,[edx+eax*4]
add eax,ebx
jmp FindAndEnd

UnFindAndEnd:
pop esi
xor eax,eax
FindAndEnd:
mov RetVanlue,eax
pop esi
}
return RetVanlue;
}

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