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AoB Scanning

 
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&Vage
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Joined: 25 Jul 2008
Posts: 1053
PostPosted: Thu Dec 18, 2008 10:16 am    Post subject: AoB Scanning Reply with quote
I made my own Signature scanner and it always seem to return an invalid address

Code:

DWORD Search(char* addr){
   int min = 0x00400000;
   int max = 0x7FFFFFFF;
   char *temp;
   int length = strlen(addr);

   for(; min <=max ; min++){
      temp = new char[length];
      memcpy((void*)temp,(void*)min, length);
      if(addr == temp){
            return (DWORD)min;
      }
   }
   return 0;
}


:S

Last edited by &Vage on Thu Dec 18, 2008 11:49 am; edited 2 times in total
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b6ooy
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PostPosted: Thu Dec 18, 2008 10:37 am    Post subject: Reply with quote
why zeromemory min of you are going to return it ?
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&Vage
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PostPosted: Thu Dec 18, 2008 10:50 am    Post subject: Reply with quote
b6ooy wrote:
why zeromemory min of you are going to return it ?


I wanted to take off some memory usage.
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Stylo
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PostPosted: Thu Dec 18, 2008 11:19 am    Post subject: Reply with quote
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O
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&Vage
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PostPosted: Thu Dec 18, 2008 11:21 am    Post subject: Reply with quote
1qaz wrote:
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O


Oh! Lol! Ok fixed Smile, still doesn't work :/
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Reak
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PostPosted: Thu Dec 18, 2008 11:21 am    Post subject: Re: AoB Scanning Reply with quote
_void_ wrote:
Code:
ZeroMemory((void*)min,sizeof(min));
ZeroMemory((void*)max,sizeof(max));
ZeroMemory((void*)temp,sizeof(temp));
return (DWORD)min;


Makes no sense to me :S.

Edit: nuuu I ish late Sad
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hcavolsdsadgadsg
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PostPosted: Thu Dec 18, 2008 11:26 am    Post subject: Reply with quote
ZeroMemory((void*)min,sizeof(min));
ZeroMemory((void*)max,sizeof(max));
ZeroMemory((void*)temp,sizeof(temp));

is going to do horrible things.

use &, not (void*)
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Stylo
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PostPosted: Thu Dec 18, 2008 12:09 pm    Post subject: Reply with quote
how about
Code:

if (strcmp(addr,temp) == 0) return (DWORD)min;

?
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smartz993
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PostPosted: Thu Dec 18, 2008 12:46 pm    Post subject: Reply with quote
1qaz wrote:
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O


(void*) will cast whatever follows it as a pointer.

1qaz wrote:
how about
Code:

if (strcmp(addr,temp) == 0) return (DWORD)min;

?


doesn't matter, i think he's using Borland C++ Builder.
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&Vage
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PostPosted: Thu Dec 18, 2008 12:57 pm    Post subject: Reply with quote
smartz993 wrote:
1qaz wrote:
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O


(void*) will cast whatever follows it as a pointer.

1qaz wrote:
how about
Code:

if (strcmp(addr,temp) == 0) return (DWORD)min;

?


doesn't matter, i think he's using Borland C++ Builder.


MSVC++, my C++ builder trial ran out, to lazy to make a new account :/
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Spawnfestis
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PostPosted: Thu Dec 18, 2008 1:12 pm    Post subject: Reply with quote
_void_ wrote:
smartz993 wrote:
1qaz wrote:
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O


(void*) will cast whatever follows it as a pointer.

1qaz wrote:
how about
Code:

if (strcmp(addr,temp) == 0) return (DWORD)min;

?


doesn't matter, i think he's using Borland C++ Builder.


MSVC++, my C++ builder trial ran out, to lazy to make a new account :/

MSVC++ is good.. Confused
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nog_lorp
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PostPosted: Thu Dec 18, 2008 1:17 pm    Post subject: Reply with quote
Several major mistakes.

A) You are doing a shallow compare of the pointers, not a deep compare of the values they contain. addr == temp is just checking if the two addresses are the same.
B) strlen is wrong in this case. char * does not necessarily mean c string. You may want AOBS with 0s midway. You should make the function take the array and a length.
C) Minor point, no reason to copy the bytes at min into temp.

Code:
DWORD Search(char* addr, int length) {
   char *min = 0x00400000;
   char *max = 0x7FFFFFFF;
   int i;

   for (; min <= max - length; min++) {
      for (i = 0; i < length; i++) {
         if(addr[i] != min[i])
            break;
      }
      
      if (i == length)
         return (DWORD)min;
   }
   return 0;
}


You may also want to use the true image base, GetModuleHandle(NULL), or the true code base,
Code:
   DWORD *min = (DWORD *)GetModuleHandle(NULL);
   DWORD *tmp = min + min[0x3c / 4]/4;
   tmp = min + tmp[0x2c / 4]/4;
   printf("%x", tmp);

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crayzbeef
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PostPosted: Mon Dec 22, 2008 8:22 pm    Post subject: Reply with quote
Spawnfestis wrote:
_void_ wrote:
smartz993 wrote:
1qaz wrote:
but didn't you cleaned min's memory b4 you returned it?
edit: btw what's the meaning of (void*) always wondered o_O


(void*) will cast whatever follows it as a pointer.

1qaz wrote:
how about
Code:

if (strcmp(addr,temp) == 0) return (DWORD)min;

?


doesn't matter, i think he's using Borland C++ Builder.


MSVC++, my C++ builder trial ran out, to lazy to make a new account :/

MSVC++ is good.. Confused


Yeah.. borland is shit.
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