Corelight - External Proxy Detected

corelight_http
| where isnotempty(proxied)
| where not(ipv4_is_private(id_orig_h))

name: Corelight - External Proxy Detected
query: |
  corelight_http
  | where isnotempty(proxied)
  | where not(ipv4_is_private(id_orig_h))  
description: |
    'Detects external proxy usage.'
tactics:
- DefenseEvasion
- CommandAndControl
requiredDataConnectors:
- dataTypes:
  - Corelight_v2_http
  - corelight_http
  connectorId: Corelight
queryPeriod: 1h
queryFrequency: 1h
status: Available
triggerThreshold: 0
id: 05850746-9ae4-412f-838b-844f0903f4a9
triggerOperator: gt
version: 2.1.0
relevantTechniques:
- T1090
severity: Low
kind: Scheduled
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: id_orig_h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightExternalProxyDetected.yaml

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/05850746-9ae4-412f-838b-844f0903f4a9')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/05850746-9ae4-412f-838b-844f0903f4a9')]",
      "properties": {
        "alertRuleTemplateName": "05850746-9ae4-412f-838b-844f0903f4a9",
        "customDetails": null,
        "description": "'Detects external proxy usage.'\n",
        "displayName": "Corelight - External Proxy Detected",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "id_orig_h",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightExternalProxyDetected.yaml",
        "query": "corelight_http\n| where isnotempty(proxied)\n| where not(ipv4_is_private(id_orig_h))\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Low",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl",
          "DefenseEvasion"
        ],
        "techniques": [
          "T1090"
        ],
        "templateVersion": "2.1.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}