The Cryptolocker ransomware is still going strong. In essence, once your computer has been infected it encrypts all of your “document” files based on file extension and then gives the user 72 hours to pay the ransom ($300 USD or 2 BTC). It will encrypt not only the local files but also any files stored on shared drives – which makes it critical that you are protected. It is one of the few pieces of ransomware that does encryption *correctly* so at present, short of paying the ransom, there is no other means to decrypt. Bleeping Computer has a good write up of the virus and what to do:
CryptoLocker Ransomware Information Guide and FAQ | BleepingComputer
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