Ransomware Research
BlackMatter Ransomware
BlackMatter is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on July 1, 2021, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- BlackMatter
- First Seen
- July 1, 2021
How BlackMatter Ransomware Works
File Encryption Patterns
BlackMatter modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-zA-Z0-9]{9}/Ransom Note and Payment Demands
After encrypting files, BlackMatter displays ransom notes demanding payment for file recovery:
/\.[a-zA-Z0-9]{9}\.README\.txt/Ransom message:
notes/KzGzsrKzM.README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with BlackMatter ransomware:
darkside.exedfdsf.exev2.bin.exeOTSLG.ps1
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About This Analysis
This BlackMatter ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like BlackMatter.
Last updated: July 30, 2025