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Sharepoint / Office Activity

"Monitor Site Collection Administrator" incidents

Base query

OfficeActivity
| where Operation == "SiteCollectionAdminAdded"
| where UserId has "user.name"
// we can search for the sharepoint site
//| where Site_Url has "https://company.sharepoint.com/sites/SITE-Id-lorem-ipsum"
// or for the IP
//| where ClientIP == ""
| order by TimeGenerated asc
//| project TimeGenerated, UserId, Site_Url, ModifiedProperties

Properties that we observe:

Resumed query returns​

| project TimeGenerated, RecordType, Operation, ModifiedProperties, Site_Url

Mass download for a single user

Getting activity related to SharePoint file downloads

OfficeActivity
| where EventSource == "SharePoint" and Operation == "FileDownloaded"
| where UserId has "user.name"
| order by TimeGenerated asc
| summarize count() by Site_Url, UserId, ClientIP
//| project TimeGenerated, OfficeObjectId, UserId, ClientIP, ModifiedProperties

File upload

We can use this queries for "New executable via Office FileUploaded Operation" incidents

From the alert, we observe:

project UserId, ClientIP, Site_Url, SiteUrlUserFolder, FileNames
// File Activity
OfficeActivity
| where SourceFileName has "filename"
| where UserId has "user.name"
| order by TimeGenerated asc

Getting the file hash

DeviceFileEvents
| where FileName has "filename"
| where InitiatingProcessAccountUpn has "user.name"
// If the user search above doesnt work, try with the sharepoint url / username
//| where FileOriginUrl has "user_name"
| order by TimeGenerated asc
| project SHA256

Observe the DeviceId and DeviceName and check for activities on those.

If the file is downloaded from some site: InitiatingProcessFileName msedge.exe

Process executions by filename

search "FILENAME"
| where $table == "DeviceProcessEvents"
| where TimeGenerated between(datetime("2023-01-03 15:00:00") .. datetime("2023-01-03 19:00:00"))
| project TimeGenerated, DeviceName, InitiatingProcessAccountName, InitiatingProcessFolderPath, InitiatingProcessParentFileName, ProcessCommandLine
| order by TimeGenerated asc