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Cryptolocker: bad news ransomware!
This is a very serious Windows virus that encrypts your files with a 2048 bit key and demands a $300 ransom. Many are paying, if you don't have offline backup, you're screwed. Cloud synch just copies the encrypted files. Besides the referenced article, there's lots more info at reddit. Apparently Avast will catch it, but many av programs don't.
Posted by: KBK 2013-10-28
http://www.rantburg.com/poparticle.php?ID=378529