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  1. So guys this is a simple way to hook and debug functions. The use of this is that we can edit functions to your liking and modify the parameters and return values of them. With slight modifications you can modify any function to your liking too. I have put in a lot of comments that should help, hope someone has use of this. Also if you guys are interested in learning anything comment. Skill level required: 3/10 #include <Windows.h>#include <iostream>DWORD getAPI(char *Dll, char* API){ return (DWORD)GetProcAddress(GetModuleHandleA(Dll), API); //Get the module base address then find the address of the API in that module.}typedef BOOL(__stdcall * Beep_)(DWORD dwFreq, DWORD dwDuration); // Can find this wrapper on MSDN with a google searchBeep_ pBeep;BOOL __stdcall BeepX(DWORD dwFreq, DWORD dwDuration){ //dwFreq = dwFreq / 2; Proof we can change the functions paramaters //dwDuration = dwDuration / dwFreq; Proof we can change the functions paramaters printf("[Beep Called] Frequency: %d Duration: %d\n",dwFreq, dwDuration); //We can get and modify the parameters before it actually gets called. return pBeep(dwFreq, dwDuration); //Return the Beep wrapper}void *Detour(PBYTE pAddress, PBYTE dwJumpTo, DWORD dwLen){ DWORD dwOldProtect, dwBkup, dwRelAddr; VirtualProtect(pAddress, dwLen, PAGE_EXECUTE_READWRITE, &dwOldProtect); //Make sure we can write to the address and save it's old protection dwRelAddr = (DWORD)(dwJumpTo - (DWORD)pAddress) - 5; // Calcualte the JMP address, 5 bytes is uses for a standard JMP in 32bit applications *pAddress = 0xE9; //0xE9 is the byte opcode for JMP *((DWORD *)(pAddress + 0x1)) = dwRelAddr; // So we want to write to the address and we have + 1 byte so we don't over write the JMP for (DWORD x = 0x5; x < dwLen; x++) *(pAddress + x) = 0x90; //If the length of the JMP goes over 5 bytes we nop the rest of the bytes beacuse it's useless VirtualProtect(pAddress, dwLen, dwOldProtect, &dwBkup); //Restore the old protection dwBkup is useless and just for debugging tests return (PVOID)(pAddress + dwLen); // We want to return the address + size of jump so if we use to call back where the detour is we go to the next avaible bytes}int main(){ DWORD BeepAddy = getAPI("kernel32.dll", "Beep"); if (BeepAddy) //If we fine Beep in Kernel32 pBeep /*We want to point our wrapper to the 5 bytes after we just hook so the function gets called.*/ = (Beep_)Detour((BYTE*)BeepAddy/*Location of where the function is in memory*/, (BYTE*)&BeepX/*Address of our BeepX function*/, 5/*Size of bytes needed for the JMP*/); while (1) { BeepX(1000, 1000); //We can call our hooked function or the function directly does not matter. //Beep(1000, 1000); }}
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