Ransomware Research
Rhysida Ransomware
Rhysida is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Rhysida
- First Seen
- September 1, 2023
How Rhysida Ransomware Works
File Encryption Patterns
Rhysida modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..rhysidaRansom Note and Payment Demands
After encrypting files, Rhysida displays ransom notes demanding payment for file recovery:
CriticalBreachDetected.pdfRansom message:
notes/CriticalBreachDetected.pdf
Note locations:
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About This Analysis
This Rhysida 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 Rhysida.
Last updated: October 30, 2025
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