Ransomware Research
Mad Cat Ransomware
Mad Cat is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Mad Cat
- First Seen
- October 1, 2023
How Mad Cat Ransomware Works
File Encryption Patterns
Mad Cat modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-z-0-9]{4}$/Ransom Note and Payment Demands
After encrypting files, Mad Cat displays ransom notes demanding payment for file recovery:
HACKED.TXTRansom message:
notes/HACKED.TXT
Note locations:
EveryFolderRansom message:
notes/evlygha64.png
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Mad Cat ransomware:
Software.exemad catDevenders.exe
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About This Analysis
This Mad Cat 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 Mad Cat.
Last updated: July 30, 2025