Exetools  

Go Back   Exetools > General > Source Code

Notices

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 11-01-2022, 18:59
user1 user1 is offline
Family
 
Join Date: Sep 2012
Location: OUT
Posts: 1,054
Rept. Given: 575
Rept. Rcvd 120 Times in 67 Posts
Thanks Given: 721
Thanks Rcvd at 583 Times in 346 Posts
user1 Reputation: 41
Exclamation Windows Api Hooking

http://www.compile.ro/2018/06/24/interceptarea-functiilor-din-windows/
Credits to developer !
Code:
VOID DetourSet(DWORD old_func, DWORD new_func, BYTE* old_header, BYTE* new_header) {
    //adauga permisiunea de scriere in primii 5 octeti de la inceputul functiei
    DWORD op;
    VirtualProtect((LPVOID)old_func, 5, PAGE_EXECUTE_READWRITE, &op);

    //salveaza cei 5 octeti originali ai functiei
    CopyMemory(old_header, (LPVOID)old_func, 5);

    //calculeaza distanta dintre noua si vechea functie
    //  folosita ca parametru de JMP
    DWORD size = new_func - (old_func + 5);

    //construieste instructiunea JMP
    new_header[0] = 0xE9;
    new_header[1] = size >> 0;
    new_header[2] = size >> 8;
    new_header[3] = size >> 16;
    new_header[4] = size >> 24;

    //scrie instuctiunea la inceputul functiei vechi
    CopyMemory((LPVOID)old_func, new_header, 5);
}
BYTE OH_GetVersion[5];
BYTE NH_GetVersion[5];
...
DetourSet((DWORD)GetVersion, (DWORD)D_GetVersion, OH_GetVersion, NH_GetVersion);
DWORD WINAPI D_GetVersion()
{
    //copiaza cei 5 octeti originali inapoi in GetVersion
    CopyMemory((LPVOID)GetVersion, OH_GetVersion, 5);

    //apeleaza GetVersion
    DWORD v = GetVersion();

    //coipiaza JMP-ul in GetVersion
    CopyMemory((LPVOID)GetVersion, NH_GetVersion, 5);

    //modifica si returneaza valoarea
    return v & 0xFFFF00FF | 0x0200;
}
#include 
#include 

#define DETOUR_DEFINE(F) BYTE OH_##F[5]; BYTE NH_##F[5];
#define DETOUR_SET(F) DetourSet((DWORD)F, (DWORD)D_##F, OH_##F, NH_##F)
#define DETOUR_EXEC(R, F, ...) { CopyMemory((LPVOID)F, OH_##F, 5); R = F(__VA_ARGS__); CopyMemory((LPVOID)F, NH_##F, 5); }

DETOUR_DEFINE(GetVersion);
DWORD WINAPI D_GetVersion()
{
    DWORD v;
    DETOUR_EXEC(v, GetVersion);
    return v & 0xFFFF00FF | 0x0200;
}

VOID DetourSet(DWORD old_func, DWORD new_func, BYTE* old_header, BYTE* new_header)
{
    DWORD op;
    VirtualProtect((LPVOID)old_func, 5, PAGE_EXECUTE_READWRITE, &op);

    CopyMemory(old_header, (LPVOID)old_func, 5);

    DWORD size = new_func - (old_func + 5);

    new_header[0] = 0xE9;
    new_header[1] = size >> 0;
    new_header[2] = size >> 8;
    new_header[3] = size >> 16;
    new_header[4] = size >> 24;

    CopyMemory((LPVOID)old_func, new_header, 5);
}

int main() {
    DWORD v = GetVersion();
    printf("Inainte de redirectionare versiunea este: %d.%d (%d)\n", LOBYTE(LOWORD(v)), HIBYTE(LOWORD(v)), HIWORD(v));

    DETOUR_SET(GetVersion);
    v = GetVersion();
    printf("Dupa redirectionare versiunea este: %d.%d (%d)\n", LOBYTE(LOWORD(v)), HIBYTE(LOWORD(v)), HIWORD(v));

    getchar();
}
Reply With Quote
The Following 2 Users Say Thank You to user1 For This Useful Post:
niculaita (11-02-2022)
 

Tags
windows api hooking

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT +8. The time now is 11:47.


Always Your Best Friend: Aaron, JMI, ahmadmansoor, ZeNiX, chessgod101
( 1998 - 2024 )