Ransomware Research
KK Ransomware
KK is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Estonian.
Quick Facts
- Ransomware Family
- KK
- First Seen
- August 1, 2016
- Known Aliases
- Estonian
How KK Ransomware Works
Targeted Files
NOSAMPLE
Ransom Note and Payment Demands
After encrypting files, KK displays ransom notes demanding payment for file recovery:
KK_ IN YOUR DOCUMENTS..txtRansom message:
notes/KK_ IN YOUR DOCUMENTS..txt
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About This Analysis
This KK 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 KK.
Last updated: July 30, 2025