O365 Compliance Content Search Started
Description
This detection will trigger when a content search is initiated within the Office 365 Security and Compliance Center, a critical component in the suite's governance, risk management, and compliance (GRC) capabilities. By monitoring the SearchCreated operation within the o365_management_activity logs, specifically under the SecurityComplianceCenter workload, this analytic flags the commencement of searches across the organization's data, including emails, documents, and more, that reside in ExchangeLocations.
- Type: TTP
-
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2024-04-01
- Author: Mauricio Velazco, Splunk
- ID: f4cabbc7-c19a-4e41-8be5-98daeaccbb50
Annotations
ATT&CK
Kill Chain Phase
- Exploitation
NIST
- DE.CM
CIS20
- CIS 10
CVE
Search
1
2
3
4
5
6
`o365_management_activity` Workload=SecurityComplianceCenter Operation=SearchCreated
| rename user_id as user
| stats count earliest(_time) as firstTime latest(_time) as lastTime by Operation, ObjectId, ExchangeLocations, user, Query
|`security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)`
| `o365_compliance_content_search_started_filter`
Macros
The SPL above uses the following Macros:
o365_compliance_content_search_started_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Required fields
List of fields required to use this analytic.
- _time
- Workload
- Operation
- ObjectId
- ExchangeLocations
- Query
- user_id
How To Implement
You must install the Splunk Microsoft Office 365 Add-on and ingest Office 365 management activity events.
Known False Positives
Compliance content searches may be executed for legitimate purposes, filter as needed.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
42.0 | 60 | 70 | A new compliance content search was started by $user$ |
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
Reference
- https://attack.mitre.org/techniques/T1114/002/
- https://learn.microsoft.com/en-us/purview/ediscovery-content-search-overview
- https://learn.microsoft.com/en-us/purview/ediscovery-keyword-queries-and-search-conditions
- https://learn.microsoft.com/en-us/purview/ediscovery-search-for-activities-in-the-audit-log
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