Ransomware Research
KoKoKrypt Ransomware
KoKoKrypt is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: KokoLocker.
Quick Facts
- Ransomware Family
- KoKoKrypt
- First Seen
- December 1, 2016
- Known Aliases
- KokoLocker
How KoKoKrypt Ransomware Works
Targeted Files
Encrypts C:\\Batch folder only
File Encryption Patterns
KoKoKrypt modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..kokolockerRansom Note and Payment Demands
After encrypting files, KoKoKrypt displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with KoKoKrypt ransomware:
Windows Update.exeEncrypter.exe
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About This Analysis
This KoKoKrypt 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 KoKoKrypt.
Last updated: July 30, 2025