Ransomware Research
CryptoKill Ransomware
CryptoKill is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CryptoKill
- First Seen
- February 1, 2017
How CryptoKill Ransomware Works
Targeted Files
Current sample encrypts %Documents%\test\ folder only. Ransom note in the %Documents%\test\
File Encryption Patterns
CryptoKill modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..cryptoRansom Note and Payment Demands
After encrypting files, CryptoKill displays ransom notes demanding payment for file recovery:
CRYPTOKILL_README.txtRansom message:
notes/CRYPTOKILL_README.txt
Technical Indicators
Associated Executable Files
The following executable files are associated with CryptoKill ransomware:
CryptoKill.exe
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About This Analysis
This CryptoKill 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 CryptoKill.
Last updated: July 30, 2025