Ransomware Research
C0hen Ransomware
C0hen is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2019, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- C0hen
- First Seen
- December 1, 2019
How C0hen Ransomware Works
Targeted Files
Encrypts Desktop files only Replaces original extension
File Encryption Patterns
C0hen modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..c0henRansom Note and Payment Demands
After encrypting files, C0hen displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with C0hen ransomware:
c0hen locker.exe
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About This Analysis
This C0hen 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 C0hen.
Last updated: July 30, 2025