BTCWare-Nuclear Ransomware
BTCWare-Nuclear is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick facts
How BTCWare-Nuclear ransomware works
File encryption patterns
BTCWare-Nuclear modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, BTCWare-Nuclear displays ransom notes demanding payment for file recovery:
notes/HELP.hta
Technical indicators
Associated executable files
The following executable files are associated with BTCWare-Nuclear ransomware:
- payload.exe
- 1.exe
- Underkeeper2
- Underkeeper2.exe
- btcware2.exe
About this analysis
This BTCWare-Nuclear 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 BTCWare-Nuclear.
Last updated: December 30, 2025
Elastio detects BTCWare-Nuclear inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify BTCWare-Nuclear 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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