Ransomware Research
Immuni Ransomware
Immuni is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Fuckunicorn.
Quick Facts
- Ransomware Family
- Immuni
- First Seen
- May 1, 2020
- Known Aliases
- Fuckunicorn
How Immuni Ransomware Works
File Encryption Patterns
Immuni modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..fuckunicornhtrhrtjrjyRansom Note and Payment Demands
After encrypting files, Immuni displays ransom notes demanding payment for file recovery:
READ_IT.txtRansom message:
notes/READ_IT.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Immuni ransomware:
IMMUNI.exeCTOzF5HBA7Zqw=&Expires=1596464469IMMUNI.binlocal.exe1CQ9KQ3F.exe
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About This Analysis
This Immuni 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 Immuni.
Last updated: July 30, 2025