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:
READ_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