WORM_KOOBFACE.AZ worm spreading via Facebook and other social networking sites

Beware of messages from friends on social networking sites saying “Take a look of this picture of you” or “Check out this video I found of you.” The links lead to a malicious website that looks like YouTube. You will then bee asked to install a viewer or a new version of flash which is actually the WORM_KOOBFACE.AZ worm. The worm will then use your contact list or friends list to send the same fake message to all your friends. The message will look legitimate to them because it will say it’s from you.

The TrendLabs Malware Blog has a very good description of what these fake messages look like and how this thing spreads.