Malware appears to have been spread via malicious links on Facebook. Malware has been identified as Troj/Dloadr-DKK Trojan horse. The malware is not present on the Israeli website, but it is very possible that they are using additional websites to spread their attack. If your PC becomes infected it is possible that you also have other malware on your computer. Join the Sophos page on Facebook, where over 150,000 people regularly share information on threats and discuss the latest security news.”]
Source: https://nakedsecurity.sophos.com/2011/11/29/facebook-worm-two-blonde-women/