PaloAlto - MAC address conflict

let threshold = 2;
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where isnotempty(DestinationMACAddress) and isnotempty(DstUsername)
| summarize UserSet = make_set(DstUsername) by DestinationMACAddress
| extend Users = array_length(UserSet)
| where Users >= threshold
| extend AccountCustomEntity = UserSet, IPCustomEntity = DestinationMACAddress

status: Available
queryFrequency: 1h
description: |
    'Detects several users with the same MAC address.'
severity: Low
version: 1.0.2
relevantTechniques:
- T1190
- T1133
name: PaloAlto - MAC address conflict
triggerThreshold: 0
kind: Scheduled
query: |
  let threshold = 2;
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where isnotempty(DestinationMACAddress) and isnotempty(DstUsername)
  | summarize UserSet = make_set(DstUsername) by DestinationMACAddress
  | extend Users = array_length(UserSet)
  | where Users >= threshold
  | extend AccountCustomEntity = UserSet, IPCustomEntity = DestinationMACAddress  
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLConflictingMacAddress.yaml
requiredDataConnectors:
- connectorId: PaloAltoCDL
  dataTypes:
  - PaloAltoCDLEvent
- connectorId: PaloAltoCDLAma
  dataTypes:
  - PaloAltoCDLEvent
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
tactics:
- InitialAccess
id: 976d2eee-51cb-11ec-bf63-0242ac130002
queryPeriod: 1h
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP

{
  "$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/976d2eee-51cb-11ec-bf63-0242ac130002')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/976d2eee-51cb-11ec-bf63-0242ac130002')]",
      "properties": {
        "alertRuleTemplateName": "976d2eee-51cb-11ec-bf63-0242ac130002",
        "customDetails": null,
        "description": "'Detects several users with the same MAC address.'\n",
        "displayName": "PaloAlto - MAC address conflict",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLConflictingMacAddress.yaml",
        "query": "let threshold = 2;\nPaloAltoCDLEvent\n| where EventResourceId =~ 'TRAFFIC'\n| where isnotempty(DestinationMACAddress) and isnotempty(DstUsername)\n| summarize UserSet = make_set(DstUsername) by DestinationMACAddress\n| extend Users = array_length(UserSet)\n| where Users >= threshold\n| extend AccountCustomEntity = UserSet, IPCustomEntity = DestinationMACAddress\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}