Ransomware has always been a terrible plague of the internet, where bad guys inject software into your computer through phishing emails. They usually trick you by saying it's from your bank, the IRS, or even your boss asking you to open something. When you do that, it's an application that runs and scrambles all of your data and asks you to give them money to get the data back.
This latest ransomware attack is a new one. One of Europe's top hotels in Austria got hacked. The cyber criminals didn't scramble the data, however. Instead they got into the electronic key system and locked all of the doors, locking guests either in or out of their room, and demanded thousands of dollars in BitCoin to unlock the doors.