MBR-Encrypting Ransomware Petya Gets Bitdefender Vaccine

The Petya ransomware that has been encrypting the NTFS Master File Table has recently been analyzed by the Bitdefender research team and found to sport similarities with other ransomware families, such as Chimera and Rokku.

This information could point to the same group of cybercriminals, except this time they’ve used advanced low level programming skills to develop the Petya strand. However, because the encryption process was flawed, our security researchers were able reverse engineer it and come up with a vaccine that makes decryption a lot easier in case of infection. Particularly, users will be presented with the decryption key, allowing immediate decryption.

An in-depth analysis of the Petya ransomware can be found in our “Petya Ransomware Goes Low Level” whitepaper (here), and here are some of its key findings:

  • Potentially same developers as the ones behind Chimera and Rokku ransomware families;
  • Works faster – Petya doesn’t encrypt files; it encrypts the NTFS Master File Table (MFT);
  • Features its own bootloader and Kernel – few ransomware families have that;
  • Reverse engineered by Bitdefender to offer a free tool that assists in  decryption of NFTS MFT (third-party tools have become available, but they’re more difficult to use).

Those who wish to avoid infection by this strand of ransomware can Download the Bitdefender Petya Ransomware Vaccine!

6 Responses to MBR-Encrypting Ransomware Petya Gets Bitdefender Vaccine


  1. Scott says:

    I use Bitdefender for an anti-virus and just added Ransomware Vaccine. I'm hoping there is no conflict between the two.

  2. Ferminum says:

    I installed it, but the "About" screen does not list Petya strand. Why?

  3. Bent Soerensen says:

    Why does it not work with my Mac?

  4. Bo Haug says:

    I can't open the downloaded program. Why and what skal I do.

  5. Rosemarie Koehler says:

    i have installed family pack, is it necessary to install this ransomeware petya ? greetings rosemarie Koehler