Ransom:Win32/StopCrypt.MJK!MTB

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.

What to do now

There is no one-size-fits-all response if you have been victimized by ransomware. 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:

• Windows Defender  for Windows 10 and Windows 8.1, 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 other 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.

Learn how you can prevent and mitigate ransomware attacks.