Ransomware Research
PyAesCrypt Ransomware
PyAesCrypt is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Marduk.
Quick Facts
- Ransomware Family
- PyAesCrypt
- First Seen
- April 1, 2019
- Known Aliases
- Marduk
How PyAesCrypt Ransomware Works
Targeted Files
Written in Python (PyInstaller)
File Encryption Patterns
PyAesCrypt modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockRansom Note and Payment Demands
After encrypting files, PyAesCrypt displays ransom notes demanding payment for file recovery:
/^ReadMe ([0-1]{1})?[0-9]{1}\.txt$/Ransom message:
notes/ReadMe 0.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with PyAesCrypt ransomware:
dll.exePyAesCrypt.exe123.exe
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About This Analysis
This PyAesCrypt 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 PyAesCrypt.
Last updated: July 30, 2025