1. WordPress Exploit Scanner – This plugin searches the files and database of your website for signs of suspicious activity. It will not stop someone hacking into your site, but it may help you find any uploaded or compromised files left by the hacker. It also examines your list of active plugins for unusual filenames.

2. WP Security Scan – This plugin scans your WordPress installation for security vulnerabilities and suggests corrective actions. It suggests user passwords, check file permissions, scans database security, hide wordpress version, scans wordpress admin protection/security, removes WP Generator META tag from core code.

3. Antivirus for Wordpress – This plugin monitors malicious injections and warns you of any possible attacks. With multilingual support. Simply, the plugin you must have.