Ransomware Research
CryptoLocker 5.1 Ransomware
CryptoLocker 5.1 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on July 1, 2016, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CryptoLocker 5.1
- First Seen
- July 1, 2016
How CryptoLocker 5.1 Ransomware Works
File Encryption Patterns
CryptoLocker 5.1 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockedRansom Note and Payment Demands
After encrypting files, CryptoLocker 5.1 displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
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About This Analysis
This CryptoLocker 5.1 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 CryptoLocker 5.1.
Last updated: July 30, 2025