Jolly Roger Ransomware
Jolly Roger is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on July 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Keep Calm.
Quick facts
How Jolly Roger ransomware works
File encryption patterns
Jolly Roger modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, Jolly Roger displays ransom notes demanding payment for file recovery:
notes/Instructions.rtf
Technical indicators
Associated executable files
The following executable files are associated with Jolly Roger ransomware:
- Keep Calm Ransomware.exe
- Liquidacion-Julio-SYD?fdp.scr
- Ransom_CRYPTEAR.SM0.exe
- KeepCalm.exe
- sample (6).exe%vir
- Liquidacion-Julio-SYD.exe
- Trojan.Ransom.HiddenTear.exe
- Liquidacion-Julio-SYD.vir.DNvir
- HiddenTear.exe
- Liquidacion-Julio-SYD
- Multa-NOM-087-ECOL-SSA1-2002
- Multa-NOM-087-ECOL-SSA1-2002.exe
- Multa-Nom-087-SSA?fdp.SCR
About this analysis
This Jolly Roger 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 Jolly Roger.
Last updated: December 30, 2025
Elastio detects Jolly Roger inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Jolly Roger across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
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