Spybot is a worm that usually arrives on a computer through Peer-to-Peer file sharing, specifically through the Kazaa file sharing network. Its many variants sometimes have other ways of spreading. It has enough variants to go through the alphabet a few times and held a record for the number of variants until it was surpassed by an IRC bot named Gaobot. It is in no way related to the Spybot Search & Destroy program.