Sunturai
Back to results
UnknownMicrosoft Sentinel analytics

New Windows Reserved Filenames staged on Office file services

This identifies new Windows Reserved Filenames on Office services like SharePoint and OneDrive in the past 7 days. It also detects when a user uploads these files to another user's workspace, which may indicate…

Description

This identifies new Windows Reserved Filenames on Office services like SharePoint and OneDrive in the past 7 days. It also detects when a user uploads these files to another user's workspace, which may indicate malicious activity.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
office365
Log source service
officeactivity

Detections can measure how the public catalogue is used — which detections people look for, and which pages bring them here. It sets a cookie that recognises this browser for 180 days. It is never linked to an account and never follows you to other sites. Privacy notice