The one thing that i know of that protects against all these Ransomeware's and your MBR is a free product. Macrium Reflect, always stay safe with a good backup solution.
If the behavior analysis of RansomFree remains stagnant thus MBAR has an edge for this.Is this product better than Malwarebytes 3.0 Anti Ransomware?
MBRFilter, if it works, should solve the issue of petya protection.
It installs a driver, but doesn't give you control over it.
It probably registers a callback to restrict write access to the MBR via FltRegisterFilter - maybe I will analyse and check next week.It installs a driver, but doesn't give you control over it.
If you try to perform any operation that affects MBR, it will probably get blocked, and if you are lucky enough to remember that you have this driver, you will have to go and uninstall it.
So other drives not protected. This software is good for me since I have only one C: in my MS SP4 and, best of all, it works on behavioral and proprietary techniques without malware signatures! Another tool for my sig-less arsenal.