Ransomware Research
JavaRatty Ransomware
JavaRatty is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: JavaCrypt.
Quick Facts
- Ransomware Family
- JavaRatty
- First Seen
- November 1, 2019
- Known Aliases
- JavaCrypt
How JavaRatty Ransomware Works
Targeted Files
https://app.any.run/tasks/0cf88813-3792-4fa3-a61f-c2af001556c9/ Written in JAVA (obfuscated) Requires internet connection Replaces the encrypted files with randomly generated 16 bytes
File Encryption Patterns
JavaRatty modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encryptedRansom Note and Payment Demands
After encrypting files, JavaRatty displays ransom notes demanding payment for file recovery:
HOWTODECRYPT.txtRansom message:
notes/HOWTODECRYPT.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with JavaRatty ransomware:
1.jar
Elastio Can Help You
Don't let JavaRatty ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This JavaRatty 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 JavaRatty.
Last updated: July 30, 2025