Koobface, an anagram of Facebook, is a computer worm that targets the users of the social networking websites Facebook...Koobface spreads by delivering Facebook messages to people that are 'friends' of someone on Facebook whose computer has already been infected. The messages contain innocuous subject headers...followed by a link. Upon receipt, the message directs the recipients to a third-party website unaffiliated with Facebook where they are prompted to download what is purported to be an update of the Adobe Flash player. If they download and execute the file, they will infect their computer with Koobface. Koobface then commandeers their surfing activities and directs users to contaminated websites when they attempt to access search engines like Google, Yahoo, Bing, and Ask.com. - susan tsairi