There is one type of Ransomware that is never going to go away and it has been talked about for the last several years. The difference is that it just keeps getting more and more sophisticated. As Ransomware develops it becomes more effective at its job and harder to remove if you get it. The latest strain is called Locky.
As with most Ransomware, this strain is usually found as an e-mail attachment. If you never open attachments, chances are you will never get infected. If you are the curious type that likes to see what is being sent then you are much more likely to get this horrible infection.