Malwarebytes Anti-Ransomware Beta is a program that protects your computer from file encrypting ransomware programs. This programs quietly sits in the background while analyzing the behaviour of the process threads on the computer. When it notices that a thread is trying to encrypt data on your computer, it will automatically terminate the thread.
It is important to note that this program is still currently in a beta stage, which means bugs will occur during its use. Even though the program has been proven to work against almost all ransomware that has been thrown at it including Cryptowall, TeslaCrypt, and CTB-Locker, bugs may occur that allow something to slip through. If you discover any bugs while using it or have feedback for the developers, you can post a comment in the Malwarebytes Anti-Ransomware Beta Feedback and Discussion topic.
Download the free software (Windows only) from HERE