A decade ago, if a desktop computer got infected with malware the chief symptom probably was an intrusive browser toolbar of some kind. Five years ago you were more likely to get whacked by a banking trojan that stole all your passwords and credit card numbers. These days if your mobile or desktop computer is infected what gets installed is likely to be “ransomware” — malicious software that locks your most prized documents, songs and pictures with strong encryption and then requires you to pay for a key to unlock the files.
Here’s some basic advice about where to go, what to do — and what not to do — when you or someone you know gets hit with ransomware.
Source: Before You Pay that Ransomware Demand… — Krebs on Security