The Koobface worm is spreading through Facebook. The Koobface worm is a worm designed specifically to spread over social-networking sites and it is spreading spam messages out to Facebook members. The motive is to enable hijacking and click fraud.
The messages offer subject lines like "You look so funny on our new video" and offer a link to a video site that pretends to have a movie clip. When the user follows the link, they are redirected to one of many different compromised hosts, according to SecurityOrb.com. Finally, the user is urged to download or open a file named flash_player.exe. That file is a new Koobface variant.
Recommendation, be aware and run an updated anti-virus software.