How to find File Origin Info through M365 Defender

[raj871280]

Hi Team,

Is there a way how one can find the information around file origin through advanced hunting queries if the file was deployed on endpoint 2 years back and hasn't been modified since then ?

Regards

Raj

[#2 · Accepted solution]

Hi @raj871280 ,

The DeviceFileEvents contains Timestamp , which record the Date and time when the event was recorded. Additionally the ActionType will provide us information based on FileCreated, FileDeleted, FileModified or FileRenamed. (More here https://docs.microsoft.com/microsoft-365/security/defender/advanced-hunting-devicefileevents-table?v...)

Based on that understanding, we can do following steps:
1. query DeviceFileEvents group by FileName, Timestamp => unmodified file, will only have 1 record
2. filter the record having only 1 count.

Typical query would like this (please test)

DeviceFileEvents
| summarize totalTransaction=count() by FileName,FileOritinUrl, Timestamp
| where totalTransaction = 1

Cheers,

Riwut