Ransomware Research

Nullhexxx Ransomware

Nullhexxx is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2025, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Nullhexxx
First Seen
April 1, 2025

How Nullhexxx Ransomware Works

Targeted Files

Full extension -> .[nullhexxx@gmail.com].C63F241F

File Encryption Patterns

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

File extensions added after encryption:

./\.[A-F0-9]{8}$/

Ransom Note and Payment Demands

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

fileREAD-ME-Nullhexxx.txt

Ransom message:

notes/READ-ME-Nullhexxx.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/Eclipse.png

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Nullhexxx ransomware:

  • C77L.exe.xBAD

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About This Analysis

This Nullhexxx 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 Nullhexxx.

Last updated: July 30, 2025

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