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Microsoft Security Intelligence
Published May 30, 2019 | Updated Oct 12, 2020

Ransom:Win32/Maze

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

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.

Maze ransomware is delivered as a payload in human-operated ransomware attacks. Adversaries behind human-operated attacks exhibit extensive knowledge of systems administration and common network security misconfigurations, perform thorough reconnaissance, and adapt to what they discover in a compromised network. 

Attackers deploying this ransomware target large enterprises and use the following methods:

  • Email messages with a malicious file attachment
  • Network compromise through vulnerabilities and other exposures

The attackers also threaten to release stolen data on the internet if the ransom is not paid.

For information about Maze and other human-operated ransomware campaigns, read these blog posts:

Human-operated ransomware attacks: A preventable disaster

Microsoft works with healthcare organizations to protect from popular ransomware during COVID-19 crisis: Here’s what to do

Ransomware groups continue to target healthcare, critical services; here’s how to reduce risk

There is no one-size-fits-all response if you have been targeted 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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