Those who clicked on the linked without the latest up-to-date anti-virus software were finding that their Facebook account information and passwords were being stolen. That information was then used to continue the spread of the Koobface virus.
The Microsoft Malware Protection Center (MMPC) was able to come into Facebook and add detection to Koobface to their Malicious Software Removal Tool (MSRT). Adding this protection the two teams are protecting hundreds of millions of people.
Since the latest version of MSRT was installed Facebook has been able to remove Koobface nearly 200,000 times from over 133,677 computers in more than 140 different locales around the world.
The MMPC has not finished their work at Facebook. Koobface is a tricky virus, constantly changing to avoid the best anti-virus software. It has over 20,000 variations to date.
Those with Windows operating systems and using the Automatic Updates feature should already have received the MSRT each month as part of standard security updates.
Those who fear that Koobface has attacked their computer can use the Microsoft’s free online virus scanner.