Install bitninja firewall

To install bitninja on Debian/Ubuntu, run

sudo su -c "echo deb http://apt.bitninja.io/debian/ bitninja non-free >> /etc/apt/sources.list.d/bitninja.list"
sudo su -c "wget -O- http://apt.bitninja.io/7F8B47DC.gpg | apt-key add -"
sudo apt-get update
sudo apt-get install bitninja
sudo bitninja-config --set license_key=YOUR_LICENSE_KEY_HERE
sudo /etc/init.d/bitninja start

To scan malware, run

bitninjacli --module=MalwareScanner --scan=/var/www