Corelight - Network Service Scanning Multiple IP Addresses

let threshold = 25;
union isfuzzy=true corelight_conn, corelight_conn_agg
| where local_resp == true
| where local_orig == true
| where conn_state in~ ('S0', 'REJ')
| where history !contains 'D'
| summarize count() by id_orig_h, id_resp_p, bin(TimeGenerated, 1m)
| where count_ > threshold

name: Corelight - Network Service Scanning Multiple IP Addresses
triggerOperator: gt
query: |
  let threshold = 25;
  union isfuzzy=true corelight_conn, corelight_conn_agg
  | where local_resp == true
  | where local_orig == true
  | where conn_state in~ ('S0', 'REJ')
  | where history !contains 'D'
  | summarize count() by id_orig_h, id_resp_p, bin(TimeGenerated, 1m)
  | where count_ > threshold
queryFrequency: 1h
description: |
  'Identify scanning of services that may be available on the internal network.'
id: 599570d4-06f8-4939-8e29-95cd003f1abd
triggerThreshold: 0
queryPeriod: 1h
version: 2.2.0
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - corelight_conn
  - corelight_conn_red
  - corelight_conn_long
  - corelight_conn_agg
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic%20Rules/CorelightNetworkServiceScanning.yaml
relevantTechniques:
- T1566
tactics:
- InitialAccess
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: id_orig_h
  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/599570d4-06f8-4939-8e29-95cd003f1abd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/599570d4-06f8-4939-8e29-95cd003f1abd')]",
      "properties": {
        "alertRuleTemplateName": "599570d4-06f8-4939-8e29-95cd003f1abd",
        "customDetails": null,
        "description": "'Identify scanning of services that may be available on the internal network.'\n",
        "displayName": "Corelight - Network Service Scanning Multiple IP Addresses",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "id_orig_h",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic%20Rules/CorelightNetworkServiceScanning.yaml",
        "query": "let threshold = 25;\nunion isfuzzy=true corelight_conn, corelight_conn_agg\n| where local_resp == true\n| where local_orig == true\n| where conn_state in~ ('S0', 'REJ')\n| where history !contains 'D'\n| summarize count() by id_orig_h, id_resp_p, bin(TimeGenerated, 1m)\n| where count_ > threshold\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "2.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}