Ransomware Research

KingOuroboros Ransomware

KingOuroboros is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2018, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
KingOuroboros
First Seen
June 1, 2018

How KingOuroboros Ransomware Works

Targeted Files

8ccb8d636263e4041454e336caa77fce9f7f0f6260ead8a2bc5f8c954f17d89e -> not working sample original_file_name.king_ouroboros.original_file_extension c03bc8bca99649841c97d3f9835acd3bc97496049ffd837fca6d0e30581d0517 -> OK

Ransom Note and Payment Demands

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

message

Ransom message:

notes/note.txt

Note locations:

Login
fileREADME!!! ALL YOUR FILES HAVE BEEN SECURELY ENCRYPTED!!!.txt

Ransom message:

notes/README!!! ALL YOUR FILES HAVE BEEN SECURELY ENCRYPTED!!!.txt

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with KingOuroboros ransomware:

  • Java Update Scheduler
  • jusched.exe
  • KingOuroboros.exe
  • JAVA_UPDATER.EXE
  • sa.exe
  • dumped

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About This Analysis

This KingOuroboros 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 KingOuroboros.

Last updated: July 30, 2025

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