Corelight - Network Service Scanning Multiple IP Addresses

let threshold = 25;
Corelight
| where EventType =~ 'conn'
| where ZeekConnLocalSrc == 'True'
| where ZeekConnLocalDst == 'True'
| where NetworkConnectionState in~ ('S0', 'REJ')
| where NetworkConnectionHistory !contains 'D'
| summarize count() by SrcIpAddr, DstPort, bin(TimeGenerated, 1m)
| where count_ > threshold
| extend IPCustomEntity = SrcIpAddr

name: Corelight - Network Service Scanning Multiple IP Addresses
query: |
  let threshold = 25;
  Corelight
  | where EventType =~ 'conn'
  | where ZeekConnLocalSrc == 'True'
  | where ZeekConnLocalDst == 'True'
  | where NetworkConnectionState in~ ('S0', 'REJ')
  | where NetworkConnectionHistory !contains 'D'
  | summarize count() by SrcIpAddr, DstPort, bin(TimeGenerated, 1m)
  | where count_ > threshold
  | extend IPCustomEntity = SrcIpAddr  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightNetworkServiceScanning.yaml
queryFrequency: 1h
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - Corelight
  connectorId: Corelight
version: 1.0.0
status: Available
queryPeriod: 1h
id: 599570d4-06f8-4939-8e29-95cd003f1abd
triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
relevantTechniques:
- T1566
severity: Medium
description: |
    'Identify scanning of services that may be available on the internal network.'
kind: Scheduled
tactics:
- InitialAccess

{
  "$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/599570d4-06f8-4939-8e29-95cd003f1abd')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/599570d4-06f8-4939-8e29-95cd003f1abd')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Corelight - Network Service Scanning Multiple IP Addresses",
        "description": "'Identify scanning of services that may be available on the internal network.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let threshold = 25;\nCorelight\n| where EventType =~ 'conn'\n| where ZeekConnLocalSrc == 'True'\n| where ZeekConnLocalDst == 'True'\n| where NetworkConnectionState in~ ('S0', 'REJ')\n| where NetworkConnectionHistory !contains 'D'\n| summarize count() by SrcIpAddr, DstPort, bin(TimeGenerated, 1m)\n| where count_ > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "alertRuleTemplateName": "599570d4-06f8-4939-8e29-95cd003f1abd",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightNetworkServiceScanning.yaml"
      }
    }
  ]
}