Ransomware Research
CryLocker Ransomware
CryLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Cry, CSTO.
Quick Facts
- Ransomware Family
- CryLocker
- First Seen
- August 1, 2016
- Known Aliases
- CryCSTO
How CryLocker Ransomware Works
File Encryption Patterns
CryLocker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..cryRansom Note and Payment Demands
After encrypting files, CryLocker displays ransom notes demanding payment for file recovery:
/^!Recovery_\S+\.html\b/Ransom message:
notes/!Recovery_dbEQfH.html
Note locations:
Desktop/^!Recovery_\S+\.txt\b/Ransom message:
notes/!Recovery_123.txt
Note locations:
DesktopRansom message:
notes/crylocker-wallpaper.png
Note locations:
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About This Analysis
This CryLocker 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 CryLocker.
Last updated: July 30, 2025