Ransomware Research
CryTekk Ransomware
CryTekk is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2019, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CryTekk
- First Seen
- January 1, 2019
How CryTekk Ransomware Works
Targeted Files
NOSAMPLE
File Encryption Patterns
CryTekk modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockedRansom Note and Payment Demands
After encrypting files, CryTekk displays ransom notes demanding payment for file recovery:
README.htmlRansom message:
notes/README.html.txt
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About This Analysis
This CryTekk 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 CryTekk.
Last updated: July 30, 2025