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

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:

fileYOUR_FILES_ARE_ENCRYPTED.TXT

Ransom message:

notes/YOUR_FILES_ARE_ENCRYPTED.TXT

Note locations:

EveryFolder
filereadme.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: October 30, 2025

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