Ransomware Research

SepSys Ransomware

SepSys is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2020, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
SepSys
First Seen
February 1, 2020

How SepSys Ransomware Works

Targeted Files

check IP via http://www.myip.ch

File Encryption Patterns

SepSys modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..sepsys

Ransom Note and Payment Demands

After encrypting files, SepSys displays ransom notes demanding payment for file recovery:

fileREADME.html

Ransom message:

notes/README.html

Note locations:

ProgramData

Technical Indicators

Associated Executable Files

The following executable files are associated with SepSys ransomware:

  • destructy-1.0.exe
  • card-genwizard.exe
  • sepsys.exe
  • SMBGhoster_1.2.exe

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About This Analysis

This SepSys 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 SepSys.

Last updated: July 30, 2025

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