Ransomware Research
Encephalitis Ransomware
Encephalitis is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Encephalitis
- First Seen
- August 1, 2017
How Encephalitis Ransomware Works
Targeted Files
Written in AutoIT
File Encryption Patterns
Encephalitis modifies encrypted files using specific patterns to mark them as encrypted:
Prefixes added to encrypted files:
Lock.Ransom Note and Payment Demands
After encrypting files, Encephalitis displays ransom notes demanding payment for file recovery:
Ransom message:
notes/y7t.jpg
Note locations:
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About This Analysis
This Encephalitis 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 Encephalitis.
Last updated: July 30, 2025