Some of the nastiest exploits going around are the many variants of the CryptoLocker and CryptoWall malware that encrypt all your personal files and hold them for ransom. Payment in bitcoin is required, in amounts starting at $200 and ranging upward to the $17,000 (400 BTC) that Hollywood Presbyterian Hospital just paid to unlock their files. Or even more. The amount will be whatever the attackers think they can extract from the victim.
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