New or Modified Federation Domain

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Identifies a new or modified federation domain, which can be used to create a trust between O365 and an external identity provider.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-o365*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: None (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Cloud
  • Microsoft 365
  • Continuous Monitoring
  • SecOps
  • Identity and Access

Version: 2

Rule authors:

  • Austin Songer

Rule license: Elastic License v2

Investigation guide

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## Config

The Office 365 Logs Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule query

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event.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:("Set-AcceptedDomain" or
"Set-MsolDomainFederationSettings" or "Add-FederatedDomain" or "New-AcceptedDomain" or "Remove-AcceptedDomain" or "Remove-FederatedDomain") and
event.outcome:success

Framework: MITRE ATT&CKTM