Conditional Access - A Conditional Access usergrouprole exclusion has changed

// A Conditional Access user/group/role exclusion has changed.
AuditLogs
| where OperationName in ("Update conditional access policy")
| extend excludeUsersOld = extractjson("$.conditions.users.excludeUsers", tostring(TargetResources[0].modifiedProperties[0].oldValue))
| extend excludeGroupsOld = extractjson("$.conditions.users.excludeGroups", tostring(TargetResources[0].modifiedProperties[0].oldValue))
| extend excludeRolesOld = extractjson("$.conditions.users.excludeRoles", tostring(TargetResources[0].modifiedProperties[0].oldValue))
| extend excludeUsersNew = extractjson("$.conditions.users.excludeUsers", tostring(TargetResources[0].modifiedProperties[0].newValue))
| extend excludeGroupsNew = extractjson("$.conditions.users.excludeGroups", tostring(TargetResources[0].modifiedProperties[0].newValue))
| extend excludeRolesNew = extractjson("$.conditions.users.excludeRoles", tostring(TargetResources[0].modifiedProperties[0].newValue))
| where excludeUsersOld != excludeUsersNew or excludeGroupsOld != excludeGroupsNew or excludeRolesOld != excludeRolesNew
| 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,
          excludeUsersOld, excludeUsersNew, excludeGroupsOld, excludeGroupsNew, excludeRolesOld, excludeRolesNew
| order by TimeGenerated desc

description: A Conditional Access user/group/role exclusion has changed in Azure AD.
queryPeriod: 5m
suppressionDuration: 5h
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Conditional Access - A Conditional Access usergrouprole exclusion has changed.yaml
id: 2ce7f00d-3b3c-41b9-ae9a-b79c19d2394e
kind: Scheduled
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
tactics:
- Persistence
- DefenseEvasion
- CredentialAccess
severity: High
triggerOperator: gt
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: 1h
    reopenClosedIncident: false
    groupByCustomDetails: []
    groupByEntities: []
    matchingMethod: AllEntities
    enabled: false
    groupByAlertDetails: []
  createIncident: true
version: 1.0.0
query: |
  // A Conditional Access user/group/role exclusion has changed.
  AuditLogs
  | where OperationName in ("Update conditional access policy")
  | extend excludeUsersOld = extractjson("$.conditions.users.excludeUsers", tostring(TargetResources[0].modifiedProperties[0].oldValue))
  | extend excludeGroupsOld = extractjson("$.conditions.users.excludeGroups", tostring(TargetResources[0].modifiedProperties[0].oldValue))
  | extend excludeRolesOld = extractjson("$.conditions.users.excludeRoles", tostring(TargetResources[0].modifiedProperties[0].oldValue))
  | extend excludeUsersNew = extractjson("$.conditions.users.excludeUsers", tostring(TargetResources[0].modifiedProperties[0].newValue))
  | extend excludeGroupsNew = extractjson("$.conditions.users.excludeGroups", tostring(TargetResources[0].modifiedProperties[0].newValue))
  | extend excludeRolesNew = extractjson("$.conditions.users.excludeRoles", tostring(TargetResources[0].modifiedProperties[0].newValue))
  | where excludeUsersOld != excludeUsersNew or excludeGroupsOld != excludeGroupsNew or excludeRolesOld != excludeRolesNew
  | 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,
            excludeUsersOld, excludeUsersNew, excludeGroupsOld, excludeGroupsNew, excludeRolesOld, excludeRolesNew
  | order by TimeGenerated desc  
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 5m
suppressionEnabled: false
relevantTechniques:
- T1098
- T1078
name: Conditional Access - A Conditional Access user/group/role exclusion has changed
entityMappings:
- fieldMappings:
  - columnName: accountName
    identifier: Name
  - columnName: upnSuffix
    identifier: UPNSuffix
  entityType: Account

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/2ce7f00d-3b3c-41b9-ae9a-b79c19d2394e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2ce7f00d-3b3c-41b9-ae9a-b79c19d2394e')]",
      "properties": {
        "alertRuleTemplateName": "2ce7f00d-3b3c-41b9-ae9a-b79c19d2394e",
        "customDetails": null,
        "description": "A Conditional Access user/group/role exclusion has changed in Azure AD.",
        "displayName": "Conditional Access - A Conditional Access user/group/role exclusion has changed",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "accountName",
                "identifier": "Name"
              },
              {
                "columnName": "upnSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "groupByAlertDetails": [],
            "groupByCustomDetails": [],
            "groupByEntities": [],
            "lookbackDuration": "PT1H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Conditional Access - A Conditional Access usergrouprole exclusion has changed.yaml",
        "query": "// A Conditional Access user/group/role exclusion has changed.\nAuditLogs\n| where OperationName in (\"Update conditional access policy\")\n| extend excludeUsersOld = extractjson(\"$.conditions.users.excludeUsers\", tostring(TargetResources[0].modifiedProperties[0].oldValue))\n| extend excludeGroupsOld = extractjson(\"$.conditions.users.excludeGroups\", tostring(TargetResources[0].modifiedProperties[0].oldValue))\n| extend excludeRolesOld = extractjson(\"$.conditions.users.excludeRoles\", tostring(TargetResources[0].modifiedProperties[0].oldValue))\n| extend excludeUsersNew = extractjson(\"$.conditions.users.excludeUsers\", tostring(TargetResources[0].modifiedProperties[0].newValue))\n| extend excludeGroupsNew = extractjson(\"$.conditions.users.excludeGroups\", tostring(TargetResources[0].modifiedProperties[0].newValue))\n| extend excludeRolesNew = extractjson(\"$.conditions.users.excludeRoles\", tostring(TargetResources[0].modifiedProperties[0].newValue))\n| where excludeUsersOld != excludeUsersNew or excludeGroupsOld != excludeGroupsNew or excludeRolesOld != excludeRolesNew\n| extend modifiedBy = tostring(InitiatedBy.user.userPrincipalName)\n| extend accountName = tostring(split(modifiedBy, \"@\")[0])\n| extend upnSuffix = tostring(split(modifiedBy, \"@\")[1])\n| project TimeGenerated, OperationName, policy = TargetResources[0].displayName, modifiedBy, accountName, upnSuffix, result = Result,\n          excludeUsersOld, excludeUsersNew, excludeGroupsOld, excludeGroupsNew, excludeRolesOld, excludeRolesNew\n| order by TimeGenerated desc\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "DefenseEvasion",
          "Persistence"
        ],
        "techniques": [
          "T1078",
          "T1098"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}