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Analytic rule catalog

PROD TM0081 - GPO - Linked Unlinked or Enforced at Root of Domain

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Idfe468726-b1dc-4e76-adad-3480de4a2c56
RulenamePROD (TM008.1) - GPO - Linked, Unlinked, or Enforced at Root of Domain
DescriptionLinked, Unlinked, or Enforced GPOs at the Root of the Domain which could overwrite Tier Model GPOs.
SeverityHigh
TacticsDefenseEvasion
TechniquesT1484.001
Required data connectorsSecurityEvents
WindowsSecurityEvents
KindScheduled
Query frequency5m
Query period5m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM008_GPOLinkedUnlinkedOrEnforcedAtRootOfDomain.yaml
Version1.0.0
Arm templatefe468726-b1dc-4e76-adad-3480de4a2c56.json
Deploy To Azure
SecurityEvent 
| where EventID == 5136 
    and EventData matches regex @"(?i)DC="
    and Activity has "modified" 
    and EventData has '"ObjectClass">domainDNS'
    and EventData has '<Data Name="AttributeLDAPDisplayName">gPLink</Data>' 
    and (EventData has ';0]' 
        or EventData has ';1]' 
        or EventData has ';2]')
    and EventData has '"OperationType">%%14674'
| extend ObjectName = extract("<Data Name=\"ObjectDN\">([^<]+)</Data>", 1, EventData)
| where ObjectName startswith "DC=" or ObjectName startswith "dc="
| extend ObjectTier = "Tier 0"
| extend AttributeLDAP = extract("<Data Name=\"AttributeLDAPDisplayName\">([^<]+)</Data>", 1, EventData)
| extend AttributeValue = extract("\\[([^\\]]+)\\]", 1, EventData)
| extend LastThreeChars = substring(AttributeValue, strlen(AttributeValue) - 2, 3)
| extend AttributeValueDescription = case(
    LastThreeChars == ";0", "Linked",
    LastThreeChars == ";1", "Unlinked",
    LastThreeChars == ";2", "Enforced",
    "Unknown")
| extend ObjectClass = extract("<Data Name=\"ObjectClass\">([^<]+)</Data>", 1, EventData)
| extend Domain = extract("([^.]+\\.[^.]+)$", 1, Computer)
| project TimeGenerated
   , ObjectName
   , ObjectTier
   , ObjectClass
   , ActivityType = AttributeValueDescription
   , AttributeLDAP
   , Account
   , Domain
   , Computer
   , Channel
   , EventID
   , EventData

version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM008_GPOLinkedUnlinkedOrEnforcedAtRootOfDomain.yaml
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
tactics:
- DefenseEvasion
relevantTechniques:
- T1484.001
eventGroupingSettings:
  aggregationKind: AlertPerResult
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    reopenClosedIncident: false
    enabled: false
  createIncident: true
alertDetailsOverride:
  alertDescriptionFormat: Changes to the Root of the Domain GPO could impact the Tier Model GPOs and other security controls.
  alertDisplayNameFormat: (TM008.1) A Tier 0 GPO was {{ActivityType}} at the Root of the Domain
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: ObjectName
  entityType: Account
- fieldMappings:
  - identifier: HostName
    columnName: Computer
  entityType: Host
- fieldMappings:
  - identifier: FullName
    columnName: Account
  entityType: Account
description: |
  Linked, Unlinked, or Enforced GPOs at the Root of the Domain which could overwrite Tier Model GPOs.
triggerOperator: gt
kind: Scheduled
status: Available
queryFrequency: 5m
id: fe468726-b1dc-4e76-adad-3480de4a2c56
name: PROD (TM008.1) - GPO - Linked, Unlinked, or Enforced at Root of Domain
severity: High
query: |
  SecurityEvent 
  | where EventID == 5136 
      and EventData matches regex @"(?i)DC="
      and Activity has "modified" 
      and EventData has '"ObjectClass">domainDNS'
      and EventData has '<Data Name="AttributeLDAPDisplayName">gPLink</Data>' 
      and (EventData has ';0]' 
          or EventData has ';1]' 
          or EventData has ';2]')
      and EventData has '"OperationType">%%14674'
  | extend ObjectName = extract("<Data Name=\"ObjectDN\">([^<]+)</Data>", 1, EventData)
  | where ObjectName startswith "DC=" or ObjectName startswith "dc="
  | extend ObjectTier = "Tier 0"
  | extend AttributeLDAP = extract("<Data Name=\"AttributeLDAPDisplayName\">([^<]+)</Data>", 1, EventData)
  | extend AttributeValue = extract("\\[([^\\]]+)\\]", 1, EventData)
  | extend LastThreeChars = substring(AttributeValue, strlen(AttributeValue) - 2, 3)
  | extend AttributeValueDescription = case(
      LastThreeChars == ";0", "Linked",
      LastThreeChars == ";1", "Unlinked",
      LastThreeChars == ";2", "Enforced",
      "Unknown")
  | extend ObjectClass = extract("<Data Name=\"ObjectClass\">([^<]+)</Data>", 1, EventData)
  | extend Domain = extract("([^.]+\\.[^.]+)$", 1, Computer)
  | project TimeGenerated
     , ObjectName
     , ObjectTier
     , ObjectClass
     , ActivityType = AttributeValueDescription
     , AttributeLDAP
     , Account
     , Domain
     , Computer
     , Channel
     , EventID
     , EventData
queryPeriod: 5m
customDetails:
  Computer: Computer
  EventData: EventData
  ObjectName: ObjectName
  EventID: EventID
  ObjectClass: ObjectClass
  ActivityType: ActivityType
  AttributeLDAP: AttributeLDAP
  Account: Account
  Channel: Channel
  Domain: Domain
  ObjectTier: ObjectTier

{
  "$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/fe468726-b1dc-4e76-adad-3480de4a2c56')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/fe468726-b1dc-4e76-adad-3480de4a2c56')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Changes to the Root of the Domain GPO could impact the Tier Model GPOs and other security controls.",
          "alertDisplayNameFormat": "(TM008.1) A Tier 0 GPO was {{ActivityType}} at the Root of the Domain"
        },
        "alertRuleTemplateName": "fe468726-b1dc-4e76-adad-3480de4a2c56",
        "customDetails": {
          "Account": "Account",
          "ActivityType": "ActivityType",
          "AttributeLDAP": "AttributeLDAP",
          "Channel": "Channel",
          "Computer": "Computer",
          "Domain": "Domain",
          "EventData": "EventData",
          "EventID": "EventID",
          "ObjectClass": "ObjectClass",
          "ObjectName": "ObjectName",
          "ObjectTier": "ObjectTier"
        },
        "description": "Linked, Unlinked, or Enforced GPOs at the Root of the Domain which could overwrite Tier Model GPOs.\n",
        "displayName": "PROD (TM008.1) - GPO - Linked, Unlinked, or Enforced at Root of Domain",
        "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/TM008_GPOLinkedUnlinkedOrEnforcedAtRootOfDomain.yaml",
        "query": "SecurityEvent \n| where EventID == 5136 \n    and EventData matches regex @\"(?i)DC=\"\n    and Activity has \"modified\" \n    and EventData has '\"ObjectClass\">domainDNS'\n    and EventData has '<Data Name=\"AttributeLDAPDisplayName\">gPLink</Data>' \n    and (EventData has ';0]' \n        or EventData has ';1]' \n        or EventData has ';2]')\n    and EventData has '\"OperationType\">%%14674'\n| extend ObjectName = extract(\"<Data Name=\\\"ObjectDN\\\">([^<]+)</Data>\", 1, EventData)\n| where ObjectName startswith \"DC=\" or ObjectName startswith \"dc=\"\n| extend ObjectTier = \"Tier 0\"\n| extend AttributeLDAP = extract(\"<Data Name=\\\"AttributeLDAPDisplayName\\\">([^<]+)</Data>\", 1, EventData)\n| extend AttributeValue = extract(\"\\\\[([^\\\\]]+)\\\\]\", 1, EventData)\n| extend LastThreeChars = substring(AttributeValue, strlen(AttributeValue) - 2, 3)\n| extend AttributeValueDescription = case(\n    LastThreeChars == \";0\", \"Linked\",\n    LastThreeChars == \";1\", \"Unlinked\",\n    LastThreeChars == \";2\", \"Enforced\",\n    \"Unknown\")\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   , ActivityType = AttributeValueDescription\n   , AttributeLDAP\n   , Account\n   , Domain\n   , Computer\n   , Channel\n   , EventID\n   , EventData\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1484.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1484"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}