MarsJoke Ransomware
MarsJoke is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Runner, Polyglot.
Quick facts
How MarsJoke ransomware works
File encryption patterns
MarsJoke modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, MarsJoke displays ransom notes demanding payment for file recovery:
notes/!!! Readme For Decrypt !!!.txt
Technical indicators
Associated executable files
The following executable files are associated with MarsJoke ransomware:
- sysmonitor.exe
- cdwudinv.exe
- hwfhrzla.exe
- myfile.exe
- копия_решения_суда.docx .exe
- 11
- bb
- cfchbmaw.exe
About this analysis
This MarsJoke 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 MarsJoke.
Last updated: December 30, 2025
Elastio detects MarsJoke inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify MarsJoke 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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