"Yesterday, researchers from Cisco reported that the new free tool MBRFilter, which protects a computer’s MBR sector against unauthorized access, can be used for safeguarding machines against MBR-targeting malware like Satana, Petya, or HDDCryptor ransomware. In fact, MBRFilter is just an ordinary driver which changes your MBR into a read-only mode and prevents applications from modifying or writing data to that particular section of your hard drive..." http://virusguides.com/mbrfilter-safeguards-computers-mbr-malware-ransomware/ Cisco Talos releases open source MBRFilter http://blog.talosintel.com/2016/10/mbrfilter.html Download is here: https://github.com/vrtadmin/MBRFilter/releases/tag/1.0 "...In addition to the open source code being released, Talos is also releasing a signed driver that can be installed on 32-bit and 64-bit Windows installations. Installation is performed by right-clicking on the INF file included in the linked Zip archive and selecting Install. The installation does require a system restart. The 32-bit installation can be obtained here. The 64-bit installation can be obtained here. "