Ransomware Research
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
- Ransomware Family
- BL4CK Locker
- First Seen
- June 1, 2025
How BL4CK Locker Ransomware Works
File Encryption Patterns
BL4CK Locker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..BL4CKRansom Note and Payment Demands
After encrypting files, BL4CK Locker displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with BL4CK Locker ransomware:
BL4CK Locker 2.0.exe
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About This Analysis
This BL4CK Locker 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 BL4CK Locker.
Last updated: October 30, 2025
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