Ransomware Research

Unknown Ransomware

Unknown is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2023, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Unknown
First Seen
January 1, 2023

How Unknown Ransomware Works

Targeted Files

https://app.any.run/tasks/446aa3f8-0993-41c6-bc6c-8ea9ae407234/

File Encryption Patterns

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

File extensions added after encryption:

..unknown

Ransom Note and Payment Demands

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

fileinfo.txt

Ransom message:

notes/info.txt

Note locations:

DesktopRootDiscs
fileinfo.hta

Ransom message:

notes/info.hta

Note locations:

DesktopRootDiscs

Technical Indicators

Associated Executable Files

The following executable files are associated with Unknown ransomware:

  • program.exe
  • AntiRecuvaDb.exe

Elastio Can Help You

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About This Analysis

This Unknown 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 Unknown.

Last updated: July 30, 2025