Ransomware Research
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
- Ransomware Family
- Jolly Roger
- First Seen
- July 1, 2017
- Known Aliases
- Keep Calm
How Jolly Roger Ransomware Works
Targeted Files
Requires C&C to send and receive data (RSA public key)
File Encryption Patterns
Jolly Roger modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockedRansom Note and Payment Demands
After encrypting files, Jolly Roger displays ransom notes demanding payment for file recovery:
Instructions.rtfRansom message:
notes/Instructions.rtf
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Jolly Roger ransomware:
Keep Calm Ransomware.exeLiquidacion-Julio-SYD?fdp.scrRansom_CRYPTEAR.SM0.exeKeepCalm.exesample (6).exe%virLiquidacion-Julio-SYD.exeTrojan.Ransom.HiddenTear.exeLiquidacion-Julio-SYD.vir.DNvirHiddenTear.exeLiquidacion-Julio-SYDMulta-NOM-087-ECOL-SSA1-2002Multa-NOM-087-ECOL-SSA1-2002.exeMulta-Nom-087-SSA?fdp.SCR
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About This Analysis
This Jolly Roger 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 Jolly Roger.
Last updated: July 30, 2025