NM4 Ransomware
NM4 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: NMoreira4.
Quick facts
How NM4 ransomware works
File encryption patterns
NM4 modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, NM4 displays ransom notes demanding payment for file recovery:
notes/Recovers your files.html
notes/YOUR_DRIVE_HAS_BEEN_ENCRYPTED.TXT
Technical indicators
Associated executable files
The following executable files are associated with NM4 ransomware:
- 12.exe
- file.exe
- R NM4 NMoreira 4 ransomware
- svchost.exe
- scvhost.exe
- out.exe
- finish_work.exe
About this analysis
This NM4 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 NM4.
Last updated: December 30, 2025
Elastio detects NM4 inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify NM4 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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