Ransomware Research

CryptoMix-Arena Ransomware

CryptoMix-Arena is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Arena.

Quick Facts

Ransomware Family
CryptoMix-Arena
First Seen
August 1, 2017
Known Aliases
Arena

How CryptoMix-Arena Ransomware Works

File Encryption Patterns

CryptoMix-Arena modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..arena

Ransom Note and Payment Demands

After encrypting files, CryptoMix-Arena displays ransom notes demanding payment for file recovery:

file_HELP_INSTRUCTION.TXT

Ransom message:

notes/_HELP_INSTRUCTION.TXT

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with CryptoMix-Arena ransomware:

  • BC5DFCB0DB.exe
  • BC0838B179.exe
  • myfile.exe
  • bars2.exe
  • bars.exe
  • bars.exe.bin

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About This Analysis

This CryptoMix-Arena 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 CryptoMix-Arena.

Last updated: October 30, 2025

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