GSA - Detect Source IP Scanning Multiple Open Ports

let port_scan_time = 30s;
let min_ports_threshold = 100;
NetworkAccessTraffic
| where TimeGenerated > ago(1d)
| where Action == 'Allowed'
| summarize PortsScanned = dcount(DestinationPort) by SourceIp, DestinationFqdn, bin(TimeGenerated, port_scan_time)
| where PortsScanned > min_ports_threshold
| project SourceIp, PortsScanned, TimeGenerated,DestinationFqdn

name: GSA - Detect Source IP Scanning Multiple Open Ports
triggerOperator: gt
query: |
  let port_scan_time = 30s;
  let min_ports_threshold = 100;
  NetworkAccessTraffic
  | where TimeGenerated > ago(1d)
  | where Action == 'Allowed'
  | summarize PortsScanned = dcount(DestinationPort) by SourceIp, DestinationFqdn, bin(TimeGenerated, port_scan_time)
  | where PortsScanned > min_ports_threshold
  | project SourceIp, PortsScanned, TimeGenerated,DestinationFqdn
queryFrequency: 1d
description: |
  Identifies a source IP scanning multiple open ports on Global Secure Access Firewall. This can indicate malicious scanning of ports by an attacker, trying to reveal open ports in the organization that can be compromised for initial access.
    Configurable Parameters:
    - Port scan time - the time range to look for multiple ports scanned. Default is set to 30 seconds.
    - Minimum different ports threshold - alert only if more than this number of ports scanned. Default is set to 100.
id: 82cfa6b9-5f7e-4b8b-8b2f-a63f21b7a7d1
triggerThreshold: 1
queryPeriod: 1d
version: 1.0.2
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - NetworkAccessTrafficLogs
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global%20Secure%20Access/Analytic%20Rules/SWG%20-%20Source%20IP%20Port%20Scan.yaml
relevantTechniques:
- T1046
tactics:
- Discovery
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: DestinationFqdn
  entityType: URL

{
  "$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/82cfa6b9-5f7e-4b8b-8b2f-a63f21b7a7d1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/82cfa6b9-5f7e-4b8b-8b2f-a63f21b7a7d1')]",
      "properties": {
        "alertRuleTemplateName": "82cfa6b9-5f7e-4b8b-8b2f-a63f21b7a7d1",
        "customDetails": null,
        "description": "Identifies a source IP scanning multiple open ports on Global Secure Access Firewall. This can indicate malicious scanning of ports by an attacker, trying to reveal open ports in the organization that can be compromised for initial access.\n  Configurable Parameters:\n  - Port scan time - the time range to look for multiple ports scanned. Default is set to 30 seconds.\n  - Minimum different ports threshold - alert only if more than this number of ports scanned. Default is set to 100.\n",
        "displayName": "GSA - Detect Source IP Scanning Multiple Open Ports",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIp",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "DestinationFqdn",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global%20Secure%20Access/Analytic%20Rules/SWG%20-%20Source%20IP%20Port%20Scan.yaml",
        "query": "let port_scan_time = 30s;\nlet min_ports_threshold = 100;\nNetworkAccessTraffic\n| where TimeGenerated > ago(1d)\n| where Action == 'Allowed'\n| summarize PortsScanned = dcount(DestinationPort) by SourceIp, DestinationFqdn, bin(TimeGenerated, port_scan_time)\n| where PortsScanned > min_ports_threshold\n| project SourceIp, PortsScanned, TimeGenerated,DestinationFqdn\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery"
        ],
        "techniques": [
          "T1046"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 1
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}