Its main aim is to spread itself via the social network Facebook and affect as many computers as possible. It displays a message on screen requiring users to enter some characters on the screen in order to avoid the computer restart.

Windows 2003/XP/2000/NT/ME/98/95

Koobface.FU is a worm whose main aim is to spread itself via the social network Facebook and affect as many computers as possible.

Additionally, it connects to a certain website in order to download malicious files, which belong to other variants of Koobface in order to extend its spread.

Koobface.FU is easy to recognize, as when it is run, it displays a message like the following on the screen:

This message informs users that they have to enter some characters and if they don't, the computer will be restarted in 3 minutes.