Ransomware Research
Seon Ransomware
Seon is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2018, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Seon
- First Seen
- October 1, 2018
How Seon Ransomware Works
Targeted Files
https://app.any.run/tasks/777d1b3b-d32f-4324-a82f-66de7223486e/
File Encryption Patterns
Seon modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..FIXT
Ransom Note and Payment Demands
After encrypting files, Seon displays ransom notes demanding payment for file recovery:
YOUR_FILES_ARE_ENCRYPTED.TXT
Ransom message:
notes/YOUR_FILES_ARE_ENCRYPTED.TXT
Note locations:
EveryFolder
readme.hta
Ransom message:
notes/readme.hta
Note locations:
Temp
Technical Indicators
Associated Executable Files
The following executable files are associated with Seon ransomware:
system.dll
test-s.exe
out
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About This Analysis
This Seon 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 Seon.
Last updated: July 30, 2025