Ubiquiti - Unknown MAC Joined AP

let lbperiod = 14d;
let lbperiod_24h = 24h;
let known_macs = UbiquitiAuditEvent
| where TimeGenerated between (ago(lbperiod) .. ago(lbperiod_24h))
| where DvcAction =~ 'JOIN'
| summarize makeset(SrcMacAddr);
UbiquitiAuditEvent
| where DvcAction =~ 'JOIN'
| where SrcMacAddr !in (known_macs)
| extend Device = SrcMacAddr
| extend HostCustomEntity = Device

name: Ubiquiti - Unknown MAC Joined AP
version: 1.0.2
severity: Medium
queryFrequency: 1h
triggerOperator: gt
relevantTechniques:
- T1133
status: Available
description: |
    'Detects when device with unseen MAC Address joined AP.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiUnknownMacJoined.yaml
requiredDataConnectors:
- connectorId: CustomLogsAma
  dataTypes:
  - Ubiquiti_CL
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
  entityType: Host
tactics:
- InitialAccess
queryPeriod: 14d
query: |
  let lbperiod = 14d;
  let lbperiod_24h = 24h;
  let known_macs = UbiquitiAuditEvent
  | where TimeGenerated between (ago(lbperiod) .. ago(lbperiod_24h))
  | where DvcAction =~ 'JOIN'
  | summarize makeset(SrcMacAddr);
  UbiquitiAuditEvent
  | where DvcAction =~ 'JOIN'
  | where SrcMacAddr !in (known_macs)
  | extend Device = SrcMacAddr
  | extend HostCustomEntity = Device  
kind: Scheduled
triggerThreshold: 0
id: 9757cee3-1a6c-4d8e-a968-3b7e48ded690

{
  "$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/9757cee3-1a6c-4d8e-a968-3b7e48ded690')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9757cee3-1a6c-4d8e-a968-3b7e48ded690')]",
      "properties": {
        "alertRuleTemplateName": "9757cee3-1a6c-4d8e-a968-3b7e48ded690",
        "customDetails": null,
        "description": "'Detects when device with unseen MAC Address joined AP.'\n",
        "displayName": "Ubiquiti - Unknown MAC Joined AP",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiUnknownMacJoined.yaml",
        "query": "let lbperiod = 14d;\nlet lbperiod_24h = 24h;\nlet known_macs = UbiquitiAuditEvent\n| where TimeGenerated between (ago(lbperiod) .. ago(lbperiod_24h))\n| where DvcAction =~ 'JOIN'\n| summarize makeset(SrcMacAddr);\nUbiquitiAuditEvent\n| where DvcAction =~ 'JOIN'\n| where SrcMacAddr !in (known_macs)\n| extend Device = SrcMacAddr\n| extend HostCustomEntity = Device\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}