Ransomware Research
Feguij Ransomware
Feguij is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2025, this ransomware has been actively targeting systems worldwide.
Quick facts
- Ransomware Family
- Feguij
- First Seen
- December 1, 2025
How Feguij ransomware works
File modification behavior
Feguij updates file modification timestamps after encryption.
File encryption patterns
Feguij modifies encrypted files using specific patterns to mark them as encrypted:
Extensions added after encryption
- .CNMSBNMSL
Technical indicators
Associated executable files
The following executable files are associated with Feguij ransomware:
- 一键勒索工具箱.exe
- feguij.exe
About this analysis
This Feguij 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 Feguij.
Detection coverage
Elastio detects Feguij inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Feguij across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a hunt against your recovery points to confirm.