O365 PST export alert
Description
This search detects when a user has performed an Ediscovery search or exported a PST file from the search. This PST file usually has sensitive information including email body content
- Type: TTP
-
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2020-12-16
- Author: Rod Soto, Splunk
- ID: 5f694cc4-a678-4a60-9410-bffca1b647dc
Annotations
ATT&CK
ID | Technique | Tactic |
---|---|---|
T1114 | Email Collection | Collection |
Kill Chain Phase
- Exploitation
NIST
CIS20
CVE
Search
1
2
3
4
5
`o365_management_activity` Category=ThreatManagement Name="eDiscovery search started or exported"
| stats count earliest(_time) as firstTime latest(_time) as lastTime by Source Severity AlertEntityId Operation Name
|`security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)`
| `o365_pst_export_alert_filter`
Macros
The SPL above uses the following Macros:
Note that o365_pst_export_alert_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Required field
- _time
- Category
- Name
- Source
- Severity
- AlertEntityId
- Operation
How To Implement
You must install splunk Microsoft Office 365 add-on. This search works with o365:management:activity
Known False Positives
PST export can be done for legitimate purposes but due to the sensitive nature of its content it must be monitored.
Associated Analytic story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
48.0 | 80 | 60 | User $Source$ has exported a PST file from the search using this operation- $Operation$ with a severity of $Severity$ |
Reference
Test Dataset
Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range
source | version: 1