"This article from the Register announces the release of some free software from Backfire Security called Payback. "The software has the ability to instantly and dynamically 'trace' the IP source address - no matter how well masked - of the network attack/infection and respond by launching either a Domain Name or Mail Server flood attack in the direction of the attacker." This raises quite a few questions though, the legality of the software first, and I'm not really convinced that this would hit back at hackers more than it would hit back at infected servers." - www.slashdot.org
This is interesting.