MessageBox2.c

#include <windows.h>
#include <iostream>

#define KEY 'A' // our key

// Function to encrypt/decrypt strings
void XOR(LPSTR data, int data_len) {
    for (int i = 0; i < data_len; i++) {
        data[i] ^= KEY;
    }
}

int main() {
    // Load the user32.dll library
    HMODULE user32Dll = GetModuleHandleW(L"user32.dll");

    // Define a function pointer for MessageBoxW
    typedef int (WINAPI* MessageBoxWFunc)(
        HWND hwnd,
        LPCWSTR lpText,
        LPCWSTR lpCaption,
        UINT uType
        );

    // Encrypted version of "MessageBoxW"
    char messageboxfunc[] = { 0x0C, 0x24, 0x32, 0x32, 0x20, 0x26, 0x24, 0x03, 0x2E, 0x39, 0x16, 0x00 }; // NULL-terminated string

 
    // Decrypt the API name
    XOR(messageboxfunc, strlen(messageboxfunc));

    // Get the MessageBoxW function address using decrypted API name
    MessageBoxWFunc pMessageBoxW = (MessageBoxWFunc)GetProcAddress(user32Dll, messageboxfunc);

    LPCWSTR Text = L"Hello hackers!";
    LPCWSTR Title = L"Title";

    // Invoke the function
    int result = pMessageBoxW(nullptr, Text, Title, MB_OK);

    return 0;
}