We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names
Win32/Petya
Aliases: No associated aliases
Summary
Microsoft Defender Antivirus  detects and removes this threat.
This ransomware can stop you from using your PC or accessing your data. It might ask you to pay money to a malicious hacker.
Our ransomware page has more information on this type of threat.
Note: On June 27, 2017, a new variant of Ransom:Win32/Petya was observed spreading in several countries. The new variant added a worm-like capability that allows it to spread across affected networks. Read about the Petya outbreak here:
Microsoft doesn’t recommend you pay the fine. There is no guarantee that paying the ransom will give you access to your files.
If you've already paid, see our ransomware page for help on what to do now.
Run antivirus or antimalware software
Use the following free Microsoft software to detect and remove this threat:
- Microsoft Defender Antivirus  for Windows 8.1 and Windows 10, or Microsoft Security Essentials for Windows 7 and Windows Vista
- Microsoft Safety Scanner
You should also run a full scan. A full scan might find hidden malware.
Advanced troubleshooting
To restore your PC, you might need to download and run Windows Defender Offline. See our advanced troubleshooting page for more help.
You can also ask for help from other PC users at the Microsoft virus and malware community.
If you’re using Windows XP, see our Windows XP end of support page.
Use cloud protection
The Microsoft Active Protection Service (MAPS) uses cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender for Windows 10.Â
