Wordfence starts by checking if your site is already infected. We do a deep server-side scan of your source code comparing it to the Official WordPress repository for core, themes and plugins. Then Wordfence secures your site and makes it up to 50 times faster.
Wordfence Security is 100% free. We also offer a Premium API key that gives you access to our premium support ticketing system at support.wordfence.com along with two factor authentication via SMS, country blocking and the ability to schedule scans for specific times