Ransomware Research

BlackRuby Ransomware

BlackRuby is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2018, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
BlackRuby
First Seen
February 1, 2018

How BlackRuby Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..BlackRuby

Prefixes added to encrypted files:

Encrypted_

Ransom Note and Payment Demands

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

fileHOW-TO-DECRYPT-FILES.txt

Ransom message:

notes/HOW-TO-DECRYPT-FILES.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with BlackRuby ransomware:

  • Windows Defender.exe
  • WindowsUI.exe
  • file.exe
  • WINDOWSUI.EXE
  • windowsui.exe

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About This Analysis

This BlackRuby 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 BlackRuby.

Last updated: October 30, 2025

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