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:

..rhysida

Ransom Note and Payment Demands

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

fileCriticalBreachDetected.pdf

Ransom message:

notes/CriticalBreachDetected.pdf

Note locations:

EveryFolder

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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: July 30, 2025