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
Targeted Files
Full filename -> desktop.ini.{dalailama2015@protonmail.ch}.CrySiS
File Encryption Patterns
CrySiS modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..CrySisRansom Note and Payment Demands
After encrypting files, CrySiS displays ransom notes demanding payment for file recovery:
How to decrypt your files.txtRansom message:
notes/How to decrypt your files.txt
How to decrypt your data.txtRansom message:
notes/How to decrypt your data.txt
Note locations:
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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: July 30, 2025