Ransomware Research
Kostya Ransomware
Kostya is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2016, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Kostya
- First Seen
- October 1, 2016
How Kostya Ransomware Works
File Encryption Patterns
Kostya modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..k0styaRansom Note and Payment Demands
After encrypting files, Kostya displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
LoginTechnical Indicators
Associated Executable Files
The following executable files are associated with Kostya ransomware:
Rainmeter.exeRansom.K0stya.exeRainmeter.pdf.exeRAINMETER.PDF.EXE
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About This Analysis
This Kostya 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 Kostya.
Last updated: July 30, 2025