Ransomware Research
CryptoFortress Ransomware
CryptoFortress is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2016, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CryptoFortress
- First Seen
- March 1, 2016
How CryptoFortress Ransomware Works
File Encryption Patterns
CryptoFortress modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..frtrssRansom Note and Payment Demands
After encrypting files, CryptoFortress displays ransom notes demanding payment for file recovery:
READ IF YOU WANT YOUR FILES BACK.htmlRansom message:
notes/READ IF YOU WANT YOUR FILES BACK.html
Note locations:
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About This Analysis
This CryptoFortress 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 CryptoFortress.
Last updated: July 30, 2025