- Home
- Detectable Ransomware
- BlackClaw
Ransomware Research
BlackClaw Ransomware
BlackClaw is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Black Claw.
Quick Facts
- Ransomware Family
- BlackClaw
- First Seen
- May 1, 2020
- Known Aliases
- Black Claw
How BlackClaw Ransomware Works
Targeted Files
Encrypts first 0x100200 bytes
File Encryption Patterns
BlackClaw modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..bclaw
..apocalypse
Ransom Note and Payment Demands
After encrypting files, BlackClaw displays ransom notes demanding payment for file recovery:
RECOVER YOUR FILES.hta
Ransom message:
notes/RECOVER YOUR FILES.hta
Note locations:
EveryFolder
RECOVER YOUR FILES.txt
Ransom message:
notes/RECOVER YOUR FILES.txt
Elastio Can Help You
Don't let BlackClaw ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This BlackClaw 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 BlackClaw.
Last updated: July 30, 2025