Ransomware Research

Bl@ckLocker Ransomware

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

Quick Facts

Ransomware Family
Bl@ckLocker
First Seen
August 1, 2025

How Bl@ckLocker Ransomware Works

File Encryption Patterns

Bl@ckLocker modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..BL@CKLOCKED

Ransom Note and Payment Demands

After encrypting files, Bl@ckLocker displays ransom notes demanding payment for file recovery:

fileInstructions.html

Ransom message:

notes/Instructions.html

Note locations:

EveryFolder
screenshot

Ransom message:

notes/6ibwVvFms.jpg

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Bl@ckLocker ransomware:

  • BLACK.exe
  • 6cyd4zfz2.exe

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About This Analysis

This Bl@ckLocker 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 Bl@ckLocker.

Last updated: September 30, 2025

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