Ransomware Research
NB65 Ransomware
NB65 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2022, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: ContiStolen.
Quick Facts
- Ransomware Family
- NB65
- First Seen
- April 1, 2022
- Known Aliases
- ContiStolen
How NB65 Ransomware Works
File Encryption Patterns
NB65 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..NB65Ransom Note and Payment Demands
After encrypting files, NB65 displays ransom notes demanding payment for file recovery:
R3ADM3.txtRansom message:
notes/R3ADM3.txt
Note locations:
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About This Analysis
This NB65 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 NB65.
Last updated: July 30, 2025