New or Modified Federation Domain
editNew or Modified Federation Domain
editIdentifies 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:
- https://docs.microsoft.com/en-us/powershell/module/exchange/remove-accepteddomain?view=exchange-ps
- https://docs.microsoft.com/en-us/powershell/module/exchange/remove-federateddomain?view=exchange-ps
- https://docs.microsoft.com/en-us/powershell/module/exchange/new-accepteddomain?view=exchange-ps
- https://docs.microsoft.com/en-us/powershell/module/exchange/add-federateddomain?view=exchange-ps
- https://docs.microsoft.com/en-us/powershell/module/exchange/set-accepteddomain?view=exchange-ps
- https://docs.microsoft.com/en-us/powershell/module/msonline/set-msoldomainfederationsettings?view=azureadps-1.0
Tags:
- Elastic
- Cloud
- Microsoft 365
- Continuous Monitoring
- SecOps
- Identity and Access
Version: 2
Rule authors:
- Austin Songer
Rule license: Elastic License v2
Investigation guide
edit## Config The Office 365 Logs Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule query
editevent.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
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Domain Policy Modification
- ID: T1484
- Reference URL: https://attack.mitre.org/techniques/T1484/
-
Sub-technique:
- Name: Domain Trust Modification
- ID: T1484.002
- Reference URL: https://attack.mitre.org/techniques/T1484/002/