{
  "$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/f3e2433b-6456-4009-a1cb-0d4eb3a36125')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f3e2433b-6456-4009-a1cb-0d4eb3a36125')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Modification to any Tier Model OU ACL.",
          "alertDisplayNameFormat": "(TM006.1) A {{ObjectTier}} OU ACL was modified at the following {{ObjectName}} OU"
        },
        "alertRuleTemplateName": "f3e2433b-6456-4009-a1cb-0d4eb3a36125",
        "customDetails": {
          "Account": "Account",
          "ActivityType": "ActivityType",
          "AttributeLDAP": "AttributeLDAP",
          "Channel": "Channel",
          "Computer": "Computer",
          "Domain": "Domain",
          "EventData": "EventData",
          "EventID": "EventID",
          "ObjectClass": "ObjectClass",
          "ObjectName": "ObjectName",
          "ObjectTier": "ObjectTier",
          "OperationType": "OperationType"
        },
        "description": "ACL modification of any Tier Model OU.\n",
        "displayName": "PROD (TM006.1) - ACL - Modified at Tier Level OU",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ObjectName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Account",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM006_ACLModifiedAtTierLevelOU.yaml",
        "query": "SecurityEvent \n| where EventID == 5136 \n    and (EventData matches regex @\"(?i)OU=Domain Controllers\"\n        or EventData matches regex @\"(?i)OU=Tier 0 Member Servers\"\n        or EventData matches regex @\"(?i)OU=Tier 1 Member Servers\"\n        or EventData matches regex @\"(?i)OU=Tier 2 End-User Accounts\"\n        or EventData matches regex @\"(?i)OU=Tier 2 End-User Devices\"\n        or EventData matches regex @\"(?i)OU=Tier 2 End-User Groups\"\n        or EventData matches regex @\"(?i)OU=Tier Model Administration\"\n        or EventData matches regex @\"(?i)OU=Tier Model Computer Quarantine\")\n    and Activity has \"modified\" \n    and EventData has '\"ObjectClass\">organizationalUnit'\n    and EventData has '<Data Name=\"AttributeLDAPDisplayName\">nTSecurityDescriptor</Data>'\n    and EventData has '\"OperationType\">%%14674'\n| extend ObjectName = extract(\"(?i)<Data Name=\\\"ObjectDN\\\">(((?i)OU=[^,]+,?)+),[dD][cC]=\", 1, EventData)\n| extend ObjectTier = case(\n    ObjectName has \"Tier 0\", \"Tier 0\",\n    ObjectName has \"Tier 1\", \"Tier 1\",\n    ObjectName has \"Tier 2\", \"Tier 2\",\n    ObjectName has \"Tier Model Administration\", \"Tier 0\",\n    ObjectName has \"Tier Model Computer Quarantine\", \"Tier 0\",\n    ObjectName has \"Domain Controllers\", \"Tier 0\",\n    \"Unknown\")\n| extend AttributeLDAP = extract(\"<Data Name=\\\"AttributeLDAPDisplayName\\\">([^<]+)</Data>\", 1, EventData)\n| extend AttributeValue = extract(\"\\\\[([^\\\\]]+)\\\\]\", 1, EventData)\n| extend OperationType = iff(EventData has 'nTSecurityDescriptor', \"ACL Modified\", tostring(OperationType))\n| extend ActivityType = extract(\"([a-zA-Z]+)\\\\.$\", 1, Activity)\n| extend ObjectClass = extract(\"<Data Name=\\\"ObjectClass\\\">([^<]+)</Data>\", 1, EventData)\n| extend Domain = extract(\"([^.]+\\\\.[^.]+)$\", 1, Computer)\n| project TimeGenerated\n   , ObjectName\n   , ObjectTier\n   , ObjectClass\n   , OperationType\n   , ActivityType\n   , AttributeLDAP\n   , Account\n   , Domain\n   , Computer\n   , Channel\n   , EventID\n   , EventData\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1222.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1222"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}