Ransomware Research
MBR-ONI Ransomware
MBR-ONI is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: ONI.
Quick Facts
- Ransomware Family
- MBR-ONI
- First Seen
- June 1, 2017
- Known Aliases
- ONI
How MBR-ONI Ransomware Works
Targeted Files
Encrypts every 0x2000 bytes
File Encryption Patterns
MBR-ONI modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..oniRansom Note and Payment Demands
After encrypting files, MBR-ONI displays ransom notes demanding payment for file recovery:
!!!README!!!.htmlRansom message:
notes/!!!README!!!.html
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with MBR-ONI ransomware:
oni.exeoni.exe_org9b.exe
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About This Analysis
This MBR-ONI 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 MBR-ONI.
Last updated: July 30, 2025