Why is my console not showing up when my Dll is loaded? - c++

Question

I have two files, the file which I'll use to load the Dll into the process is the following:
#include <Windows.h>
int main()
{
// path to our dll
LPCSTR DllPath = any_path;
// Open a handle to target process
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, 26188);
// Allocate memory for the dllpath in the target process
// length of the path string + null terminator
LPVOID pDllPath = VirtualAllocEx(hProcess, 0, strlen(DllPath) + 1,
MEM_COMMIT, PAGE_READWRITE);
// Write the path to the address of the memory we just allocated
// in the target process
WriteProcessMemory(hProcess, pDllPath, (LPVOID)DllPath,
strlen(DllPath) + 1, 0);
// Create a Remote Thread in the target process which
// calls LoadLibraryA as our dllpath as an argument -> program loads our dll
HANDLE hLoadThread = CreateRemoteThread(hProcess, 0, 0,
(LPTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandleA("Kernel32.dll"),
"LoadLibraryA"), pDllPath, 0, 0);
// Wait for the execution of our loader thread to finish
WaitForSingleObject(hLoadThread, INFINITE);
// Free the memory allocated for our dll path
VirtualFreeEx(hProcess, pDllPath, strlen(DllPath) + 1, MEM_RELEASE);
return 0;
}
So far, it's working properly and loading the Dll into the file, however, the Dll doesn't seem to be working:
#include "pch.h"
#include <iostream>
#include <windows.h>
#include <TlHelp32.h>
DWORD WINAPI HackThread(HMODULE hModule)
{
//Create Console
AllocConsole();
FILE* f;
freopen_s(&f, "CONOUT$", "w", stdout);
std::cout << "ttt" << std::endl;
std::cin.get();
fclose(f);
FreeConsole();
FreeLibraryAndExitThread(hModule, 0);
return 0;
}
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)HackThread, hModule, 0, nullptr);
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
I know the Dll is loading properly because the process is hitting the 'DLL_PROCESS_ATTACH' case and when I tested it with a message box instead of the CreateThread, it showed up, however, I can't seem to make the console show up. What would be the problem?

Answer 1

One issue I see is that your thread is re-mapping only stdout to the new console, but it is not re-mapping stdin as well. So it is quite likely (use a debugger to verify this) that std::cin.get() is failing and thus not blocking the thread from closing the console immediately after creating it.