Ransomware Research

Ryuk.Net Ransomware

Ryuk.Net is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Chaos.

Quick Facts

Ransomware Family
Ryuk.Net
First Seen
June 1, 2021
Known Aliases
Chaos

How Ryuk.Net Ransomware Works

Targeted Files

https://marcoramilli.com/2021/06/14/the-allegedly-ryuk-ransomware-builder-ryukjoke/ 4fbbd67a32384a485efb0efb9e958a9f7b7a879d3945b16ccf80a8580bd935a7 must be named /Users/qq/AppData/Roaming/svchost.exe https://blogs.blackberry.com/en/2022/05/yashma-ransomware-tracing-the-chaos-family-tree

File Encryption Patterns

Ryuk.Net modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..encrypted..encrypt..teddy..AstraLocker..CRYPTEDPAY..jamesbond2021@tutanotacom_jamesbond..deltapaymentbitcoin@gmailcom..8base./\.[0-9a-z]{4}$/..fuckazov

Ransom Note and Payment Demands

After encrypting files, Ryuk.Net displays ransom notes demanding payment for file recovery:

file

Ransom message:

notes/README.txt

Note locations:

EveryFolder
fileolvass_el.txt

Ransom message:

notes/olvass_el.txt

Note locations:

EveryFolder
filestop_propaganda.txt

Ransom message:

notes/stop_propaganda.txt

Note locations:

EveryFolder
fileread_it.txt

Ransom message:

notes/read_it.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/pcg9ss7gk.jpg

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Ryuk.Net ransomware:

  • afs.exe
  • aver.exe
  • chaos ransomware builder v3.exe
  • psn gift card generator.exe
  • rw.exe
  • svchost.exe
  • micro.exe
  • voucher-maiutazas.hu.pdf.exe
  • PSN Gift Card Generator.exe
  • user.exe
  • svchost.exe

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About This Analysis

This Ryuk.Net 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 Ryuk.Net.

Last updated: July 30, 2025

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