Users of BitTorrent client app Transmission became the first reported victims of Mac ransomware this week. People who downloaded infected versions of the app also received "KeRanger" malware, 9to5Mac says, nefarious software that would encrypt a user's hard drive three days after being installed and demand payment to unlock the data. Ransomware has hit headlines in recent months — one LA hospital had to pay $17,000 to an unknown group to regain control of its computer systems