Ransomware Research
NullByte Ransomware
NullByte is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Necrobot.
Quick Facts
- Ransomware Family
- NullByte
- First Seen
- August 1, 2016
- Known Aliases
- Necrobot
How NullByte Ransomware Works
File Encryption Patterns
NullByte modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
._nullbyteRansom Note and Payment Demands
After encrypting files, NullByte displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
LoginRansom message:
notes/bg.jpg
Note locations:
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About This Analysis
This NullByte 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 NullByte.
Last updated: July 30, 2025