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Location: Desktop
Ransomware Research
Cust Ransomware
Cust 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
- Cust
- First Seen
- December 1, 2025
How Cust ransomware works
File modification behavior
Cust updates file modification timestamps after encryption.
File encryption patterns
Cust modifies encrypted files using specific patterns to mark them as encrypted:
Extensions added after encryption
- .cust
Ransom note and payment demands
After encrypting files, Cust displays ransom notes demanding payment for file recovery:
Technical indicators
Associated executable files
The following executable files are associated with Cust ransomware:
- 81wsaqsx.exe
- bloxstrap.exe
About this analysis
This Cust 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 Cust.
Detection coverage
Elastio detects Cust inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Cust 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.