PST Export Alert Using eDiscovery Alert — Sigma Rule

Rule metadata and linked tags

Author: Sorina Ionescu. Source status: test; severity: medium. Source dates: 2022-02-08 / 2022-11-17.

{
  "service": "threat_management",
  "product": "m365",
  "definition": "Requires the 'eDiscovery search or exported' alert to be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: cd3e91f5ed123645ba2a0a3c47b54c7c07608d00a556e3727813f15aca392298

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: PST Export Alert Using eDiscovery Alert
id: 18b88d08-d73e-4f21-bc25-4b9892a4fdd0
related:
    - id: 6897cd82-6664-11ed-9022-0242ac120002
      type: similar
status: test
description: Alert on 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
references:
    - https://learn.microsoft.com/en-us/microsoft-365/compliance/alert-policies?view=o365-worldwide
author: Sorina Ionescu
date: 2022-02-08
modified: 2022-11-17
tags:
    - attack.collection
    - attack.t1114
logsource:
    service: threat_management
    product: m365
    definition: Requires the 'eDiscovery search or exported' alert to be enabled
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'eDiscovery search started or exported'
        status: success
    condition: selection
falsepositives:
    - PST export can be done for legitimate purposes but due to the sensitive nature of its content it must be monitored.
level: medium

Original YAML and metadata in JSON

False positives

• PST export can be done for legitimate purposes but due to the sensitive nature of its content it must be monitored.

Source references

• https://learn.microsoft.com/en-us/microsoft-365/compliance/alert-policies?view=o365-worldwide