Ransomware Research
Javalocker Ransomware
Javalocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: JavaEncrypt.
Quick Facts
- Ransomware Family
- Javalocker
- First Seen
- March 1, 2020
- Known Aliases
- JavaEncrypt
How Javalocker Ransomware Works
Targeted Files
Written in Java (8) Should be start -> java jar SAMPLE.jar
File Encryption Patterns
Javalocker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..javaencryptRansom Note and Payment Demands
After encrypting files, Javalocker displays ransom notes demanding payment for file recovery:
readmeonnotepad.javaencryptRansom message:
notes/readmeonnotepad.javaencrypt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Javalocker ransomware:
14370-0db8a7d767a2454998bf3ee875676929.jarJAVABASIC.jar14369-f23a33a6934441ef00510f62d691b104.jar14632-f0a2f76a1250d3c586dca4b754558d1a.jar2.jar
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About This Analysis
This Javalocker 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 Javalocker.
Last updated: July 30, 2025