Ransomware Research

Fun Ransomware

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

Quick Facts

Ransomware Family
Fun
First Seen
December 1, 2023

How Fun Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..funny

Ransom Note and Payment Demands

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

filereadme.txt

Ransom message:

notes/readme.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/pflt8bq46.jpg

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Fun ransomware:

  • ransom.fun.exe
  • 20231208bea34c8a69222a2780cefa45263eba5bwannacry.exe
  • svchost.exe

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About This Analysis

This Fun 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 Fun.

Last updated: July 30, 2025

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