OzymanDNS – Tunneling SSH over DNS http://www.room362.com/blog/2009/3/10/ozymandns-tunneling-ssh-over-dns.html

Malware Hunting with the Sysinternals Tools http://channel9.msdn.com/Events/TechEd/NorthAmerica/2012/SIA302

Server Shield v1.0.2 – Protect your Linux machine in 1 minute – Penetration Testing and Security Tools http://toolsyard.thehackernews.com/2012/10/server-shield-v102-protect-your-linux.html