Researchers Find 'Vaccine' for Global Ransomware Attack

A vaccine, not a killswitch, has been discovered to prevent the Petya/NotPetya ransomware from infecting machines.

Dark Reading Staff, Dark Reading

June 28, 2017

1 Min Read
Dark Reading logo in a gray background | Dark Reading

Researchers have yet to discover a killswitch that would prevent the spread of this week's massive ransomware outbreak, but one has found a "vaccine" that can halt the spread of the attack, reports BleepingComputer.

The rapidly spreading ransomware hit businesses, including those in critical infrastructure, across Russia, Ukraine, France, Netherlands, Spain, India, and Denmark. Some experts found similarities with the Petya malware, including its encryption of the Master Boot Record (MBR) on infected systems. Others say this malware hasn't been previously seen and call it NotPetya.

Amit Serper, a security researcher with Cybereason, discovered the ransomware operates by searching for a local file, and will exit the encryption process if the file already existed on the disk. Victims can block the ransomware from executing by creating this file on their machines.

To implement the vaccination, create a file called "perfc" in the "C:\Windows" folder and set it to read-only. Researchers call this a vaccination, not a killswitch, because it only vaccinates the machine where it's stored. A killswitch could be turned on to prevent all incidents of this ransomware.

Read more details here.

About the Author

Dark Reading Staff

Dark Reading

Dark Reading is a leading cybersecurity media site.

Keep up with the latest cybersecurity threats, newly discovered vulnerabilities, data breach information, and emerging trends. Delivered daily or weekly right to your email inbox.

You May Also Like


More Insights