Ransomware Research

OCT Ransomware

OCT is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: OctEncrypt.

Quick Facts

Ransomware Family
OCT
First Seen
December 1, 2020
Known Aliases
OctEncrypt

How OCT Ransomware Works

Targeted Files

Couldnt create Ransom note (crashes before)

File Encryption Patterns

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

File extensions added after encryption:

..oct..no_hacker

Ransom Note and Payment Demands

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

fileREAD_ME.txt

Ransom message:

notes/READ_ME.txt

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with OCT ransomware:

  • OCT_RANSOMWARE 1.2V.exe
  • 무단_사진_도용_관련_탄원서.pdf .exe
  • nohacker ransomware.exe
  • BATTLE_GROUND_ACCOUNT HACKING.exe

Elastio Can Help You

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About This Analysis

This OCT 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 OCT.

Last updated: July 30, 2025

OCT Ransomware - Detectable by Elastio