Koobface variant worms across social networking sites

A new strain of the Koobface worm is spreading across social networking sites including Facebook, MySpace and Bebo. The malware posts invitations to the friends of infected users inviting them to view a video. The linked website tries to trick prospective marks into believing they need an updated version of Adobe Flash Player plugin to view the clip. The software offered is, of course, loaded with Windows-specific Trojan code. This malware establishes a back-door on compromised Windows machines. The attack follows the appearance of two rogue applications - "Error Check System" and Facebook closing down - last week which used misleading messages in order to hoodwink users into activating software packages. Neither app spread malware as such but Error Check System has been linked to indirect attempts to attract surfers to sites punting rogue anti-malware (AKA scareware) packages.

Source: http://www.theregister.co.uk/2009/03/02/koobface_worm_returns/