Ransomware Research

Killer Skull Ransomware

Killer Skull is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2024, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Killer Skull
First Seen
November 1, 2024

How Killer Skull Ransomware Works

File Encryption Patterns

Killer Skull modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

./\.[0-9a-z]{4}$/

Ransom Note and Payment Demands

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

filepayment_information.txt

Ransom message:

notes/payment_information.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/gntjecqqm.jpg

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Killer Skull ransomware:

  • killerskull.exe
  • runtimebroker.exe

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About This Analysis

This Killer Skull 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 Killer Skull.

Last updated: July 30, 2025