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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

ATT&CK

ID Technique Tactic
T1114 Email Collection Collection
T1114.002 Remote Email Collection Collection
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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 `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:

:information_source: 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 $user$

:information_source: 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

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

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