Ransomware Research
Jeno Ransomware
Jeno is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Jest, Valeria.
Quick Facts
- Ransomware Family
- Jeno
- First Seen
- April 1, 2020
- Known Aliases
- JestValeria
How Jeno Ransomware Works
Targeted Files
Only renames files
File Encryption Patterns
Jeno modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..jestRansom Note and Payment Demands
After encrypting files, Jeno displays ransom notes demanding payment for file recovery:
note.iniRansom message:
notes/note.ini
Note locations:
ProgramDataRansom message:
notes/note.txt
Note locations:
LoginTechnical Indicators
Associated Executable Files
The following executable files are associated with Jeno ransomware:
jeno2jeno2.exerecover.exeO266F2ZQ.exe
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About This Analysis
This Jeno 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 Jeno.
Last updated: July 30, 2025