Default Wordpress /wp-admin/index.php file

Default WordPress /wp-admin/index.php file file if the orginal is corrupt or compromised with malware
Extracted from wordpress-5.8.1-en (2021)

<?php

/**
 * Dashboard Administration Screen
 *
 * @package WordPress
 * @subpackage Administration
 */

/** Load WordPress Bootstrap */
require_once __DIR__ . '/admin.php';

/** Load WordPress dashboard API */
require_once ABSPATH . 'wp-admin/includes/dashboard.php';

wp_dashboard_setup();

wp_enqueue_script( 'dashboard' );

if ( current_user_can( 'install_plugins' ) ) {
	wp_enqueue_script( 'plugin-install' );
	wp_enqueue_script( 'updates' );
}
if ( current_user_can( 'upload_files' ) ) {
	wp_enqueue_script( 'media-upload' );
}
add_thickbox();

if ( wp_is_mobile() ) {
	wp_enqueue_script( 'jquery-touch-punch' );
}

$title       = __( 'Dashboard' );
$parent_file = 'index.php';

$help = '<p>' . __( 'Welcome to your WordPress Dashboard! This is the screen you will see when you log in to your site, and gives you access to all the site management features of WordPress. You can get help for any screen by clicking the Help tab above the screen title.' ) . '</p>';

$screen = get_current_screen();

$screen->add_help_tab(
	array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' => $help,
	)
);