ESET Stops WannaCryptor, WannaCry and EternalBlue! Use our free tool to make sure Windows vulnerabilities are patched. What is Petya ransomware? On June 27, 2017, a ransomware attack known as Petya(detected by ESET as Win32/Diskcoder.C Trojan) began spreading rapidly around the globe. The Petya malware attacks a computer’s MBR (master boot record), a key part of the … More ESET protects against Petya and WannaCry ransomware!