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:

..locked

Ransom Note and Payment Demands

After encrypting files, Jolly Roger displays ransom notes demanding payment for file recovery:

fileInstructions.rtf

Ransom message:

notes/Instructions.rtf

Note locations:

Desktop

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

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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

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