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:

..encrypted

Ransom Note and Payment Demands

After encrypting files, Crypren displays ransom notes demanding payment for file recovery:

fileREAD_THIS_TO_DECRYPT.html

Ransom message:

notes/READ_THIS_TO_DECRYPT.html

Note locations:

Desktop
message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion

Technical Indicators

Associated Executable Files

The following executable files are associated with Crypren ransomware:

  • myfile.exe
  • pren.exe
  • k.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: October 30, 2025

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