Ransomware Research
MIMUS Ransomware
MIMUS is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- MIMUS
- First Seen
- April 1, 2023
How MIMUS Ransomware Works
Targeted Files
Written in GO 1.20 Encodes filenames with base64 FILES_ENCRYPTED.html file on the Desktop Requires C&C in TOR (for manual patch find cmp ecx, cc -> patch 2 conditional jumps)
File Encryption Patterns
MIMUS modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encryptedRansom Note and Payment Demands
After encrypting files, MIMUS displays ransom notes demanding payment for file recovery:
READ_TO_DECRYPT.htmlRansom message:
notes/READ_TO_DECRYPT.html
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with MIMUS ransomware:
lol.exe
Elastio Can Help You
Don't let MIMUS ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This MIMUS 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 MIMUS.
Last updated: July 30, 2025