injector.cpp

#include "stdafx.h"
#include <iostream>
#include <Windows.h>

using namespace std;

int main(int argc,char *argv[])
{
	int pid;
	char* dllpath = "C:\\users\\user\\documents\\visual studio 2015\\Projects\\injector\\x64\\Debug\\dllexample.dll";

	cout << "Input process id" << endl;
	cin >> pid;

	HANDLE target_process = OpenProcess(PROCESS_ALL_ACCESS,FALSE,pid);
	if (target_process == NULL) {
		cout << "Faild to OpenProcess()" << endl;
		return -1;
	}

	LPVOID la_addr = (LPVOID)GetProcAddress(GetModuleHandle(L"kernel32.dll"), "LoadLibraryA");
	if (la_addr == NULL) {
		cout << "Faild to GetProcAddress()" << endl;
		return -1;
	}

	LPVOID alloc_addr = (LPVOID)VirtualAllocEx(target_process, NULL, strlen(dllpath), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
	if (alloc_addr == NULL) {
		cout << "Faild to VirtualAllocEx()" << endl;
		return -1;
	}

	int n = WriteProcessMemory(target_process, alloc_addr, dllpath, strlen(dllpath), NULL);
	if (n == 0) {
		cout << "Faild to WriteProcessMemory()" << endl;
		return -1;
	}

	HANDLE thread_id = CreateRemoteThread(target_process, NULL, 0, (LPTHREAD_START_ROUTINE)la_addr, alloc_addr,0,NULL);
	if (thread_id == NULL) {
		cout << "Faild to CreateRemoteThread()" << endl;
		cout << "GetLastError " << GetLastError() << endl;
		return -1;
	}

	cout << "Success DLL Injection" << endl;
	CloseHandle(target_process);
	getchar();

    return 0;
}