Ransomware Research
Cossy Ransomware
Cossy is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2018, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Grafimatriux.
Quick Facts
- Ransomware Family
- Cossy
- First Seen
- December 1, 2018
- Known Aliases
- Grafimatriux
How Cossy Ransomware Works
File Encryption Patterns
Cossy modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..Защищено RSA-2048Ransom Note and Payment Demands
After encrypting files, Cossy displays ransom notes demanding payment for file recovery:
Как все эту шалашкину контору расшифровать.txtRansom message:
notes/Как все эту шалашкину контору расшифровать.txt
Note locations:
EveryFolderКрайне важная инфа.RSA-2048 файлRansom message:
notes/Крайне важная инфа.RSA-2048 файл
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Cossy ransomware:
Cossy.exeCossy.binAttachment.rar
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About This Analysis
This Cossy 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 Cossy.
Last updated: October 30, 2025
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