Ransomware Research
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
- Ransomware Family
- MrDec
- First Seen
- December 1, 2018
How MrDec Ransomware Works
Targeted Files
Full extension -> .[ID]zC6A0Fbj-DXpgRW2[ID]
File Encryption Patterns
MrDec modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.\[ID\][\w-]{16}\[ID\]$/Ransom Note and Payment Demands
After encrypting files, MrDec displays ransom notes demanding payment for file recovery:
Decoding help.htaRansom message:
notes/Decoding help.hta
Note locations:
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About This Analysis
This MrDec 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 MrDec.
Last updated: July 30, 2025