Corelight - External Proxy Detected

Corelight
| where EventType =~ 'http'
| where isnotempty(HttpProxiedHeaders)
| where ipv4_is_private(SrcIpAddr) == 'False'
| extend IPCustomEntity = SrcIpAddr

severity: Low
triggerThreshold: 0
query: |
  Corelight
  | where EventType =~ 'http'
  | where isnotempty(HttpProxiedHeaders)
  | where ipv4_is_private(SrcIpAddr) == 'False'
  | extend IPCustomEntity = SrcIpAddr  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight
id: 05850746-9ae4-412f-838b-844f0903f4a9
version: 1.0.0
name: Corelight - External Proxy Detected
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightExternalProxyDetected.yaml
queryPeriod: 1h
relevantTechniques:
- T1090
triggerOperator: gt
tactics:
- DefenseEvasion
- CommandAndControl
description: |
    'Detects external proxy usage.'
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/05850746-9ae4-412f-838b-844f0903f4a9')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/05850746-9ae4-412f-838b-844f0903f4a9')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Corelight - External Proxy Detected",
        "description": "'Detects external proxy usage.'\n",
        "severity": "Low",
        "enabled": true,
        "query": "Corelight\n| where EventType =~ 'http'\n| where isnotempty(HttpProxiedHeaders)\n| where ipv4_is_private(SrcIpAddr) == 'False'\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "CommandAndControl"
        ],
        "techniques": [
          "T1090"
        ],
        "alertRuleTemplateName": "05850746-9ae4-412f-838b-844f0903f4a9",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightExternalProxyDetected.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
    }
  ]
}