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Microsoft Security Intelligence
Published Dec 21, 2021 | Updated Jun 28, 2023


Detected by Microsoft Defender Antivirus

Aliases: No associated aliases


BlackCat is a family of ransomware written in Rust targeting Windows and Linux. We discuss our findings related to the Linux variant of this family, including:

  • Analysis and behavior of discovered samples and their relationship to other ransomware families
  • Detections for this family
  • Symptoms of a successful attack
  • Techniques for preventing this attack in the future

This ransomware encrypts the data on your disk and can stop you from using your device or accessing your data. It encrypts files, renders them inaccessible, and demands payment for the decryption key.

For more information about BlackCat and other human-operated ransomware campaigns, read these posts:

There is no one-size-fits-all response if you have been victimized by ransomware. To recover files, you can restore backups. There is no guarantee that paying the ransom will give you access to your files.

Microsoft Defender Antivirus automatically removes threats as they are detected. However, many infections can leave remnant files and system changes. Updating your antimalware definitions and running a full scan might help address these remnant artifacts.

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

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