ONI Ransomware
ONI is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2018, this ransomware has been actively targeting systems worldwide.
Quick facts
How ONI ransomware works
File encryption patterns
ONI modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, ONI displays ransom notes demanding payment for file recovery:
notes/RESTORE_ONI_FILES.txt
Technical indicators
Associated executable files
The following executable files are associated with ONI ransomware:
- oni.exe
Recovery and decryption tools
Decryption tools may be available for ONI. Review the resources below:
About this analysis
This ONI 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 ONI.
Last updated: December 30, 2025
Elastio detects ONI inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify ONI 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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