A new variant of the ransomware Petya (also called Petrwrap) began spreading around the world on June 27. Petya is ransomware that exploits the vulnerability CVE-2017-0144 in Microsoft’s implementation of the Server Message Block protocol. This ransomware encrypts the master boot records of infected Windows computers, making the machines unusable.

Microsoft released a set of critical patches on March 14 to remove the underlying vulnerability in supported versions of Windows, but many organizations may not yet have applied these patches.

Learn how McAfee products can protect against Petya ransomware.