BL4CK Locker Ransomware
BL4CK Locker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2025, this ransomware has been actively targeting systems worldwide.
Quick facts
How BL4CK Locker ransomware works
File encryption patterns
BL4CK Locker modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, BL4CK Locker displays ransom notes demanding payment for file recovery:
notes/note.txt
Technical indicators
Associated executable files
The following executable files are associated with BL4CK Locker ransomware:
- BL4CK Locker 2.0.exe
About this analysis
This BL4CK Locker ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like BL4CK Locker.
Last updated: December 30, 2025
Elastio detects BL4CK Locker inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify BL4CK Locker across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
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