Ransomware Research
Pennywise Ransomware
Pennywise is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Pennywise
- First Seen
- October 1, 2017
How Pennywise Ransomware Works
Targeted Files
Encrypts only test folder
File Encryption Patterns
Pennywise modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..beepRansom Note and Payment Demands
After encrypting files, Pennywise displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with Pennywise ransomware:
Setup.exe4.exeJigsaw.exejigsaw.exe
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About This Analysis
This Pennywise 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 Pennywise.
Last updated: July 30, 2025