MrDec Ransomware
MrDec is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2018, this ransomware has been actively targeting systems worldwide.
Quick facts
How MrDec ransomware works
File encryption patterns
MrDec modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, MrDec displays ransom notes demanding payment for file recovery:
notes/Decoding help.hta
About this analysis
This MrDec ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like MrDec.
Last updated: December 30, 2025
Elastio detects MrDec inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify MrDec across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
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