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Ransomware Research

CrySiS Ransomware

CrySiS is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family: CrySiS
First Seen: February 1, 2016

How CrySiS Ransomware Works

File Encryption Patterns

CrySiS modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..CrySis

Ransom Note and Payment Demands

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

fileHow to decrypt your files.txt

Ransom message:

notes/How to decrypt your files.txt

fileHow to decrypt your data.txt

Ransom message:

notes/How to decrypt your data.txt

Note locations:

Desktop

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About This Analysis

This CrySiS 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 CrySiS.

Last updated: September 30, 2025

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