Ransomware Research
BlockFile12 Ransomware
BlockFile12 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- BlockFile12
- First Seen
- May 1, 2017
How BlockFile12 Ransomware Works
Targeted Files
NOSAMPLE https://www.bleepingcomputer.com/forums/t/646345/ransomware-extension-block-file12/
File Encryption Patterns
BlockFile12 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..block_file12Ransom Note and Payment Demands
After encrypting files, BlockFile12 displays ransom notes demanding payment for file recovery:
HOW TO DECRYPT FILES.txtElastio Can Help You
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About This Analysis
This BlockFile12 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 BlockFile12.
Last updated: July 30, 2025