Conditional Access - A Conditional Access app exclusion has changed

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Id	0990a481-3bc8-4682-838c-313918dd858c
Rulename	Conditional Access - A Conditional Access app exclusion has changed
Description	A Conditional Access app exclusion has changed in Entra ID.
Severity	Low
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Conditional Access - A Conditional Access app exclusion has changed.yaml
Version	1.0.1
Arm template	0990a481-3bc8-4682-838c-313918dd858c.json

KQL

// A Conditional Access app exclusion has changed.
AuditLogs
| where OperationName in ("Update conditional access policy")
| extend excludeApplicationsOld = extractjson("$.conditions.applications.excludeApplications", tostring(TargetResources[0].modifiedProperties[0].oldValue))
| extend excludeApplicationsNew = extractjson("$.conditions.applications.excludeApplications", tostring(TargetResources[0].modifiedProperties[0].newValue))
| where excludeApplicationsOld != excludeApplicationsNew
| extend modifiedBy = tostring(InitiatedBy.user.userPrincipalName)
| extend accountName = tostring(split(modifiedBy, "@")[0])
| extend upnSuffix = tostring(split(modifiedBy, "@")[1])
| project
    TimeGenerated,
    OperationName,
    policy = TargetResources[0].displayName,
    modifiedBy,
    accountName,
    upnSuffix,
    result = Result,
    excludeApplicationsOld,
    excludeApplicationsNew
| order by TimeGenerated desc

YAML

kind: Scheduled
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT1H
    enabled: false
    groupByAlertDetails: []
    reopenClosedIncident: false
    matchingMethod: AllEntities
    groupByCustomDetails: []
    groupByEntities: []
  createIncident: true
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
relevantTechniques:
- T1071
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: accountName
  - identifier: UPNSuffix
    columnName: upnSuffix
query: |+
  // A Conditional Access app exclusion has changed.
  AuditLogs
  | where OperationName in ("Update conditional access policy")
  | extend excludeApplicationsOld = extractjson("$.conditions.applications.excludeApplications", tostring(TargetResources[0].modifiedProperties[0].oldValue))
  | extend excludeApplicationsNew = extractjson("$.conditions.applications.excludeApplications", tostring(TargetResources[0].modifiedProperties[0].newValue))
  | where excludeApplicationsOld != excludeApplicationsNew
  | extend modifiedBy = tostring(InitiatedBy.user.userPrincipalName)
  | extend accountName = tostring(split(modifiedBy, "@")[0])
  | extend upnSuffix = tostring(split(modifiedBy, "@")[1])
  | project
      TimeGenerated,
      OperationName,
      policy = TargetResources[0].displayName,
      modifiedBy,
      accountName,
      upnSuffix,
      result = Result,
      excludeApplicationsOld,
      excludeApplicationsNew
  | order by TimeGenerated desc  

triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Conditional Access - A Conditional Access app exclusion has changed.yaml
suppressionEnabled: false
queryPeriod: 5m
tactics:
- CommandAndControl
name: Conditional Access - A Conditional Access app exclusion has changed
eventGroupingSettings:
  aggregationKind: AlertPerResult
description: A Conditional Access app exclusion has changed in Entra ID.
id: 0990a481-3bc8-4682-838c-313918dd858c
version: 1.0.1
triggerOperator: gt
queryFrequency: 5m
severity: Low
suppressionDuration: 5h

ARM