An evolution of ransomware, Cryptolocker Trojan, was not a significant leap from other criminal attempts that extorted money from PC users, but seniors security advisor for Sophos told in an interview that there is a little of hype because it is the just an incarnation of ransomware. What is a ransomware? A malware encrypt the files of someone and later on convince the owners of those to pay money so that they can decrypt again. To know more about the story, check out from the source.
Source: Computer World