Ransomware Research

Cloak Ransomware

Cloak is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2025, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Cloak
First Seen
March 1, 2025

How Cloak Ransomware Works

File Encryption Patterns

Cloak modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..crYpt

Ransom Note and Payment Demands

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

filereadme_for_unlock.txt

Ransom message:

notes/readme_for_unlock.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Cloak ransomware:

  • A3R6C9.exe
  • ProgramData_A3R6C9.exe.infected

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About This Analysis

This Cloak 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 Cloak.

Last updated: July 30, 2025