Ransomware Research
Crypt0r Ransomware
Crypt0r 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
- Crypt0r
- First Seen
- January 1, 2019
How Crypt0r Ransomware Works
Targeted Files
Requires C&Cs in TOR network (also keys for encryption) https://app.any.run/tasks/0d784d0d-47b1-4a75-8639-ab245d854b49/#
File Encryption Patterns
Crypt0r modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[A-Za-z0-9]{8}$/Ransom Note and Payment Demands
After encrypting files, Crypt0r displays ransom notes demanding payment for file recovery:
_HELP.txtRansom message:
notes/_HELP.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Crypt0r ransomware:
svchost.jpgpayload_1.exesvchost.jpg.exex.dat
Elastio Can Help You
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About This Analysis
This Crypt0r 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 Crypt0r.
Last updated: July 30, 2025