Ransomware Research

Sepsis Ransomware

Sepsis is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2018, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Sepsis
First Seen
May 1, 2018

How Sepsis Ransomware Works

Targeted Files

Full extension -> .[Sepsis@protonmail.com].SEPSIS

File Encryption Patterns

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

File extensions added after encryption:

..SEPSIS

Ransom Note and Payment Demands

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

fileInfo.hta

Ransom message:

notes/Info.hta

Note locations:

StartUp

Technical Indicators

Associated Executable Files

The following executable files are associated with Sepsis ransomware:

  • svchost.exe
  • myfile.exe
  • Sepsis_Ransomware.exe
  • Sepsis_Ransomware.bin

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About This Analysis

This Sepsis 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 Sepsis.

Last updated: July 30, 2025

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