ModSecurity

ModSecurity is a plugin for Apache web servers that functions as a web app layer firewall. It is used to prevent attacks toward script-driven websites by employing security rules that contain particular expressions. In this way, the firewall can stop hacking and spamming attempts and protect even sites that aren't updated regularly. For example, a number of unsuccessful login attempts to a script administrator area or attempts to execute a specific file with the purpose to get access to the script will trigger particular rules, so ModSecurity will stop these activities the moment it identifies them. The firewall is extremely efficient as it tracks the entire HTTP traffic to a site in real time without slowing it down, so it can easily stop an attack before any harm is done. It additionally maintains an exceptionally thorough log of all attack attempts that features more info than standard Apache logs, so you can later examine the data and take extra measures to enhance the security of your Internet sites if required.