Ransomware Research

Skull Ransomware

Skull is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Skull
First Seen
September 1, 2017

How Skull Ransomware Works

Targeted Files

NOSAMPLE https://www.bleepingcomputer.com/forums/t/656185/skull-ransomware-random-6-character-ext-support-topic/

File Encryption Patterns

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

File extensions added after encryption:

./\.[A-Za-z0-9]{6}$/

Ransom Note and Payment Demands

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

fileHow_To_Decrypt_Your_Files.html

Ransom message:

notes/How_To_Decrypt_Your_Files.html.txt

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About This Analysis

This 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 Skull.

Last updated: July 30, 2025