What Is Koobface?

Although famous as virus, the Koobface is actually a worm. A worm is a malware that sneaks into your computer and replicates itself throughout the PC. The difference between a virus and a worm is that, virus attaches it self to the file where as a worm actually replaces it. A worm can even send automated emails to other PC's trying to infect them using yours.

So  Koobface is a worm and attacks a computer by downloading some .exe files into your computer. The main thing is to identify the threat at this point before it is too late.
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Basically if you are using facebook you should watch for automated email messages that display either insulting message or some thing very tempting about you. Messages like, "you look funny in this video" or "you look so stupid in this pic" can be used to persuade somone to click on the link attached. Once the user clicks on them it takes you to a video which doesn't play and they ask you to download certain codecs which can be a 'flash_player.exe' file.