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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:
Ransom message:
notes/README.txt
Note locations:
EveryFolder
olvass_el.txt
Ransom message:
notes/olvass_el.txt
Note locations:
EveryFolder
stop_propaganda.txt
Ransom message:
notes/stop_propaganda.txt
Note locations:
EveryFolder
read_it.txt
Ransom message:
notes/read_it.txt
Note locations:
EveryFolder
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
Elastio Can Help You
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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