Ransomware Research
Hyena Ransomware
Hyena is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2025, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Hyena
- First Seen
- January 1, 2025
How Hyena Ransomware Works
File Encryption Patterns
Hyena modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..hyena111Ransom Note and Payment Demands
After encrypting files, Hyena displays ransom notes demanding payment for file recovery:
READ_NOTE.htmlRansom message:
notes/READ_NOTE.html
Note locations:
EveryFolderRansom message:
notes/output.png
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Hyena ransomware:
hyena111.zip
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About This Analysis
This Hyena 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 Hyena.
Last updated: July 30, 2025