Conditional Access - A Conditional Access Device platforms condition has changed the Device platforms condition can be spoofed

// A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed).
AuditLogs
| where OperationName in ("Update conditional access policy")
| extend excludePlatformsOld = extractjson("$.conditions.platforms.excludePlatforms", tostring(TargetResources[0].modifiedProperties[0].oldValue))
| extend excludePlatformsNew = extractjson("$.conditions.platforms.excludePlatforms", tostring(TargetResources[0].modifiedProperties[0].newValue))
| where excludePlatformsOld != excludePlatformsNew
| 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,
    excludePlatformsOld,
    excludePlatformsNew
| order by TimeGenerated desc

version: 1.0.1
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Entra%20ID/Analytic%20Rules/Conditional%20Access%20-%20A%20Conditional%20Access%20Device%20platforms%20condition%20has%20changed%20%28the%20Device%20platforms%20condition%20can%20be%20spoofed%29.yaml
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
description: A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed) in Entra ID.
relevantTechniques:
- T1562.007
kind: Scheduled
suppressionDuration: 5h
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: accountName
  - identifier: UPNSuffix
    columnName: upnSuffix
  entityType: Account
triggerOperator: gt
suppressionEnabled: false
queryFrequency: 5m
id: e3368079-a2c0-4f1c-9fb7-287e907393ef
name: Conditional Access - A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed)
severity: Low
query: |
  // A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed).
  AuditLogs
  | where OperationName in ("Update conditional access policy")
  | extend excludePlatformsOld = extractjson("$.conditions.platforms.excludePlatforms", tostring(TargetResources[0].modifiedProperties[0].oldValue))
  | extend excludePlatformsNew = extractjson("$.conditions.platforms.excludePlatforms", tostring(TargetResources[0].modifiedProperties[0].newValue))
  | where excludePlatformsOld != excludePlatformsNew
  | 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,
      excludePlatformsOld,
      excludePlatformsNew
  | order by TimeGenerated desc
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT1H
    matchingMethod: AllEntities
    groupByCustomDetails: []
    enabled: false
    reopenClosedIncident: false
    groupByAlertDetails: []
    groupByEntities: []
  createIncident: true
queryPeriod: 5m
tactics:
- DefenseEvasion
eventGroupingSettings:
  aggregationKind: AlertPerResult

{
  "$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/e3368079-a2c0-4f1c-9fb7-287e907393ef')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e3368079-a2c0-4f1c-9fb7-287e907393ef')]",
      "properties": {
        "alertRuleTemplateName": "e3368079-a2c0-4f1c-9fb7-287e907393ef",
        "customDetails": null,
        "description": "A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed) in Entra ID.",
        "displayName": "Conditional Access - A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed)",
        "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%20Entra%20ID/Analytic%20Rules/Conditional%20Access%20-%20A%20Conditional%20Access%20Device%20platforms%20condition%20has%20changed%20%28the%20Device%20platforms%20condition%20can%20be%20spoofed%29.yaml",
        "query": "// A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed).\nAuditLogs\n| where OperationName in (\"Update conditional access policy\")\n| extend excludePlatformsOld = extractjson(\"$.conditions.platforms.excludePlatforms\", tostring(TargetResources[0].modifiedProperties[0].oldValue))\n| extend excludePlatformsNew = extractjson(\"$.conditions.platforms.excludePlatforms\", tostring(TargetResources[0].modifiedProperties[0].newValue))\n| where excludePlatformsOld != excludePlatformsNew\n| extend modifiedBy = tostring(InitiatedBy.user.userPrincipalName)\n| extend accountName = tostring(split(modifiedBy, \"@\")[0])\n| extend upnSuffix = tostring(split(modifiedBy, \"@\")[1])\n| project\n    TimeGenerated,\n    OperationName,\n    policy = TargetResources[0].displayName,\n    modifiedBy,\n    accountName,\n    upnSuffix,\n    result = Result,\n    excludePlatformsOld,\n    excludePlatformsNew\n| order by TimeGenerated desc\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "subTechniques": [
          "T1562.007"
        ],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}