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Detectable Ransomware Nemucod-AES
Ransomware Research
Nemucod-AES Ransomware
Nemucod-AES is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Nemucod-AES
- First Seen
- June 1, 2017
How Nemucod-AES Ransomware Works
Targeted Files
https://www.hybrid-analysis.com/sample/3124ddac6d47edef4839ee32df03ff346ab1e154b643748855aff75a320a12ae?environmentId=100 https://www.hybrid-analysis.com/sample/52ff1fa29675a6c55cab30d1dc0477c89b8f65e4e8b37ef56d2afc7c3058eac9?environmentId=100 param (php 5.6.30) -> php.exe 1FTaZDFWbBJHKsaU96ki8ozQj27XHdmoMg.php 1FTaZDFWbBJHKsaU96ki8ozQj27XHdmoMg 0.14745 MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAg2nbziQxZDzkLnFx/f9q1h2uzI+YQqhuQO9kMafj2VjFLxqOME4tLPAHVuenKJadZdQ5kncrDBP2SwUhQ1FxwU5SozxcRC3XrJV3iM2KScB8jQ/jkDA5l3KvEYshOO0vCXAtBgdh/2qsooONhnCl2JzcoHuMGPFypZ8oQ8pd0t8juJvyUrM5CSm0khimi7wdn+yP4QmxEtwl7uiWuWYiw93u+PrjZgn2Z3vXhEVOsVLwb4DjyKy3HED+8PQxauRUuFzKDE+x5BeutEQLCouTK/tljabICYR7aH0lMg9d0CSu6VPZ6Oqsbch0VvG8GtQBgfAPs97nFTDKG5f9Iof4tQIDAQAB Doesn't change filenames https://www.hybrid-analysis.com/sample/8d04ed4fdef1465686264662fb72c9e64ca60d6ea94c351d0a7c27aeb65d95bc?environmentId=100
File Encryption Patterns
Nemucod-AES modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..crypted
Ransom Note and Payment Demands
After encrypting files, Nemucod-AES displays ransom notes demanding payment for file recovery:
DECRYPT.txt
Ransom message:
notes/DECRYPT.txt
Note locations:
Desktop
Desktop.hta
Ransom message:
notes/Desktop.hta
Technical Indicators
Associated Executable Files
The following executable files are associated with Nemucod-AES ransomware:
421841.js
myvtfile.exe
UPS-Delivery-005156577.doc.js
UPS-Receipt-4424638.doc.js
UPS-Parcel-ID-4563806.doc.js
Elastio Can Help You
Don't let Nemucod-AES ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This Nemucod-AES 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 Nemucod-AES.
Last updated: July 30, 2025