Ransomware Research
Crypren Ransomware
Crypren 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
- Crypren
- First Seen
- March 1, 2016
How Crypren Ransomware Works
File Encryption Patterns
Crypren modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encryptedRansom Note and Payment Demands
After encrypting files, Crypren displays ransom notes demanding payment for file recovery:
READ_THIS_TO_DECRYPT.htmlRansom message:
notes/READ_THIS_TO_DECRYPT.html
Note locations:
DesktopRansom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with Crypren ransomware:
myfile.exepren.exek.exe
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About This Analysis
This Crypren 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 Crypren.
Last updated: July 30, 2025