Ransomware Research

KEYHolder Ransomware

KEYHolder is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2014, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
KEYHolder
First Seen
December 1, 2014

How KEYHolder Ransomware Works

Targeted Files

NOSAMPLE

Ransom Note and Payment Demands

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

fileHOW_DECRYPT.html

Ransom message:

notes/HOW_DECRYPT.html.txt

Note locations:

EveryFolder

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About This Analysis

This KEYHolder 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 KEYHolder.

Last updated: July 30, 2025