diff --git a/rules/integrations/o365/persistence_new_or_modified_federation_domain.toml b/rules/integrations/o365/persistence_new_or_modified_federation_domain.toml
new file mode 100644
index 000000000..10c0f2b82
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+++ b/rules/integrations/o365/persistence_new_or_modified_federation_domain.toml
@@ -0,0 +1,56 @@
+[metadata]
+creation_date = "2021/05/17"
+maturity = "production"
+updated_date = "2021/05/17"
+
+[rule]
+author = ["Austin Songer"]
+description = """
+Identifies a new or modified federation domain, which can be used to create a trust between O365 and an external identity
+provider.
+"""
+index = ["filebeat-*", "logs-o365*"]
+language = "kuery"
+license = "Elastic License v2"
+name = "New or Modified Federation Domain"
+note = """## Config
+
+The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule."""
+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",
+]
+risk_score = 21
+rule_id = "684554fc-0777-47ce-8c9b-3d01f198d7f8"
+severity = "low"
+tags = ["Elastic", "Cloud", "Microsoft 365", "Continuous Monitoring", "SecOps", "Identity and Access"]
+timestamp_override = "event.ingested"
+type = "query"
+
+query = '''
+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
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+reference = "https://attack.mitre.org/techniques/T1484/"
+name = "Domain Policy Modification"
+id = "T1484"
+[[rule.threat.technique.subtechnique]]
+id = "T1484.002"
+name = "Domain Trust Modification"
+reference = "https://attack.mitre.org/techniques/T1484/002/"
+
+
+[rule.threat.tactic]
+reference = "https://attack.mitre.org/tactics/TA0004/"
+name = "Privilege Escalation"
+id = "TA0004"