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Pls help with Trampoline Example (delphi / c++)

 
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rovnix
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PostPosted: Mon Feb 10, 2014 2:51 pm    Post subject: Pls help with Trampoline Example (delphi / c++) Reply with quote
Hallo someone,

I don't mean to be spoonfed. I need a simple example of a trampoline hook with _asm
Code should be c++ / delphi

Step by step explanation using comments could be more useful / simplified.

Thanking you.
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atom0s
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Location: 127.0.0.1
PostPosted: Mon Feb 10, 2014 2:53 pm    Post subject: Reply with quote
There are tons of examples on the net you can find via Google. I'd recommend you take the time to look first. If you still have issues understanding parts then come back and ask specific questions, not just 'gimmie a full example'.
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rovnix
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Joined: 09 Feb 2014
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PostPosted: Mon Feb 10, 2014 3:04 pm    Post subject: Reply with quote
You mean like this?
Code:

#include <windows.h>
#include <stdio.h>
#include <wininet.h>

DWORD HookFunction(LPCSTR lpModule, LPCSTR lpFuncName, LPVOID lpFunction, unsigned char *lpBackup);
int newHttpSendRequestW(HINTERNET hRequest, LPCTSTR lpszHeaders, DWORD dwHeadersLength, LPVOID lpOptional, DWORD dwOptionalLength);

BYTE hook[6];

int main()
{

void WinMainCRTStartup()
{

HookFunction("wininet.dll","HttpSendRequestW",newHttpSendRequestW,hook);
if dwOptionalLength > 0
{
MessageBox(0,lpOptional,"",MB_OK);
}

    }

DWORD HookFunction(LPCSTR lpModule, LPCSTR lpFuncName, LPVOID lpFunction, unsigned char *lpBackup)
 {
DWORD dwAddr = (DWORD)GetProcAddress(GetModuleHandle(lpModule),lpFuncName);
BYTE jmp[6] = { 0xe9,//jmp
0x00, 0x00, 0x00, 0x00,//address
0xc3
};
ReadProcessMemory(GetCurrentPRocess(),(LPVOID)dwAddr,lpBackup,6,0);
DWORD dwCalc = ((DWORD)lpFunction - dwAddr - 5);
&jmp[1], &dwCalc, 4);//build the jmp

WriteProcessMemory(GetCurrentProcess(), (LPVOID)dwAddr, jmp, 6, 0);

return dwAddr;

    }
}



I am hooking httpsendrequest for Educational use only.
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