W32.Spybot.Worm is a family of worms that spreads using the Kazaa file-sharing network and mIRC. This worm can also spread to computers that are infected by back door Trojan virus and on network shares protected by weak passwords. It can perform various actions by connecting to a configurable IRC server and by joining the attackers channel to get instructions. It can exploit the known unpatched vulnerabilities in windows.
It is also known asNet-Worm.Spybot [PCTools]