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
File Encryption Patterns
OCT modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..oct..no_hackerRansom Note and Payment Demands
After encrypting files, OCT displays ransom notes demanding payment for file recovery:
READ_ME.txtRansom message:
notes/READ_ME.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with OCT ransomware:
OCT_RANSOMWARE 1.2V.exe무단_사진_도용_관련_탄원서.pdf .exenohacker ransomware.exeBATTLE_GROUND_ACCOUNT HACKING.exe
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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: October 30, 2025
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