Facebook malware poses as flash update, infects 110K users.

A Trojan is making its way around the world’s most populous social network, infecting some 110,000 Facebook users in just two days.

The malware spreads itself by posting links to a pornographic video from the account of previously infected users. The postings generally tag no more than 20 friends of the infected. If and when a user opens the link contained in the post, the video begins to play but then stops and asks the viewer to install a fake Flash player containing a Trojan downloader with the actual malware.

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