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drlunar
How do I cheat?

Reputation: 0

Joined: 21 May 2011
Posts: 5

Posted: Mon Jul 16, 2012 10:01 pm Post subject: AOB Scanning

I'm using kitterz Find Pattern method, this is what I've got :

Functions.h

Code:

#include <Windows.h>
///////////////////////////////////////////////////////////////////////////////////////////////
//Memory Functions
//////////////////////////////////////////////////////////////////////////////////////////////
void WriteMemory( unsigned long ulAddress, unsigned char ucAmount, ...)
{
DWORD dwOldProtect;
VirtualProtect((void*)ulAddress, ucAmount, PAGE_EXECUTE_READWRITE, &dwOldProtect);

va_list* va = new va_list;
va_start(*va, ucAmount);

for (unsigned char ByteToWrite = va_arg(*va, unsigned char), ucIndex = 0; ucIndex < ucAmount; ucIndex++, ByteToWrite = va_arg(*va, unsigned char))
{
*(unsigned char*)(ulAddress + ucIndex) = ByteToWrite;
}

va_end(*va);
delete va;

VirtualProtect((void*)ulAddress, ucAmount, dwOldProtect, &dwOldProtect);
}
////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////
//AoB Scan
//////////////////////////////////////////////////////////////////////////////////////////////
bool Check(const BYTE* pData, const BYTE* bMask, const char* szMask)
{
for(; *szMask; ++szMask, ++pData, ++bMask)
if(*szMask != 'x' && *pData != *bMask )
return false;

return (*szMask) == NULL;
}

DWORD FindPattern(BYTE *bMask, char* szMask, DWORD dwOffset)
{
DWORD dwAddress = 0x00400000;
DWORD dwLen = 0x7FFFFFFF;
__try
{
for(DWORD i=0; i < dwLen; i++)
if( Check ((BYTE*)( dwAddress + i ), bMask, szMask) )
return (DWORD)(dwAddress + i + dwOffset);
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
MessageBox(NULL, "Find Pattern Error", "Error", MB_OK);
}

return 0x00400000;
}
//////////////////////////////////////////////////////////////////////////////////////////////

This is how I'm using it :

Form1.cpp [ Snippet ]

Code:

unsigned char TestBytes[] = {0x53, 0x5F, 0x56, 0x6C, 0x61, 0x64, 0x69, 0x6D, 0x69, 0x72, 0x5F, 0x41, 0x5F, 0x4E, 0x6F, 0x72, 0x6D, 0x61, 0x6C, 0x2E, 0x78, 0x6D, 0x6C};

unsigned long TestAddress()
{
return FindPattern((unsigned char*)TestBytes, "xxxxxxxxxxxxxxxxxxxxxxx", 0);
}

unsigned long Test = (unsigned long)TestAddress();

void Form1::button1_Click(System::Object^ sender, System::EventArgs^ e) {
if (this->button1->Text == "Set Modification")
{
this->button1->Text = "Remove Modification";
WriteMemory(Test, 23, 0x6D, 0x65, 0x72, 0x63, 0x79, 0x5F, 0x72, 0x61, 0x74, 0x68, 0x65, 0x72, 0x5F, 0x30, 0x31, 0x32, 0x33, 0x00, 0x6C, 0x2E, 0x78, 0x6D, 0x6C);
}

else
{
WriteMemory(Test, 23, 0x6D, 0x65, 0x72, 0x63, 0x79, 0x5F, 0x72, 0x61, 0x74, 0x68, 0x65, 0x72, 0x5F, 0x30, 0x31, 0x32, 0x33, 0x00, 0x6C, 0x2E, 0x78, 0x6D, 0x6C);
}
}

My issue standing, is that I can't write any bytes. I'm pretty sure I set it up just fine, but it isn't working.

n0 m3rcY
Cheater

Reputation: 0

Joined: 18 Jun 2012
Posts: 42

Posted: Tue Jul 17, 2012 2:18 pm Post subject:

Code:

*(unsigned char*)(ulAddress + ucIndex) = ByteToWrite;

If you're not in a dll, you can't interact with an address that doesn't belong to your app, even if you virtualprotected it. You'll have to use WPM and get a handle for the process. Also, you're better off using a byte array and just writing that than having a thousand arguments in your function call, looks nicer too.

I'm assuming you're not using a dll because of the form.cpp snippet, however I can't see the entry point so I could be wrong Sad

drlunar
How do I cheat?

Reputation: 0

Joined: 21 May 2011
Posts: 5

Posted: Tue Jul 17, 2012 2:52 pm Post subject:

n0 m3rcY wrote:

Code:

*(unsigned char*)(ulAddress + ucIndex) = ByteToWrite;

I currently am doing this in a .dll project, CLR :c.

atom0s
Moderator

Reputation: 205

Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1

Posted: Sun Aug 26, 2012 2:16 am Post subject:

Check the returns of the WriteProcessMemory calls to see if its failing. If it is, try using VirtualProtectEx to unprotect the memory before trying to write to it. _________________ - Retired.

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