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Ransomware Research
Jester Ransomware
Jester is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2026, this ransomware has been actively targeting systems worldwide.
Quick facts
- Ransomware Family
- Jester
- First Seen
- June 1, 2026
How Jester ransomware works
File modification behavior
Jester updates file modification timestamps after encryption.
Ransom note and payment demands
After encrypting files, Jester displays ransom notes demanding payment for file recovery:
Technical indicators
Associated executable files
The following executable files are associated with Jester ransomware:
- zpm3jj.exe
About this analysis
This Jester ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like Jester.
Detection coverage
Elastio detects Jester inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Jester across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a hunt against your recovery points to confirm.