Network Port Sweep from External Network ASIM Network Session schema

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Id	cd8faa84-4464-4b4e-96dc-b22f50c27541
Rulename	Network Port Sweep from External Network (ASIM Network Session schema)
Description	This detection rule detects scenarios when a particular port is being scanned by multiple external sources. The rule utilize ASIM normalization, and is applied to any source which supports the ASIM Network Session schema.
Severity	High
Tactics	Discovery
Required data connectors	AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoMeraki Corelight Fortinet MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents WindowsForwardedEvents Zscaler
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml
Version	1.0.2
Arm template	cd8faa84-4464-4b4e-96dc-b22f50c27541.json

KQL

let lookback = 1h;
let threshold = 20;
_Im_NetworkSession(starttime=ago(lookback),endtime=now())
| where NetworkDirection == "Inbound"
| summarize make_set(DstIpAddr,100) by DstPortNumber
| where array_length(set_DstIpAddr) > threshold

YAML

queryPeriod: 1h
alertDetailsOverride:
  alertDisplayNameFormat: Network Port Sweep detected on {{DstPortNumber}}
  alertDescriptionFormat: Network Port Sweep was detection by multiple IPs
id: cd8faa84-4464-4b4e-96dc-b22f50c27541
name: Network Port Sweep from External Network (ASIM Network Session schema)
kind: Scheduled
status: Available
description: |
    'This detection rule detects scenarios when a particular port is being scanned by multiple external sources. The rule utilize [ASIM](https://aka.ms/AboutASIM) normalization, and is applied to any source which supports the ASIM Network Session schema.'
tactics:
- Discovery
customDetails:
  AllDstIpAddr: set_DstIpAddr
triggerOperator: gt
query: |
  let lookback = 1h;
  let threshold = 20;
  _Im_NetworkSession(starttime=ago(lookback),endtime=now())
  | where NetworkDirection == "Inbound"
  | summarize make_set(DstIpAddr,100) by DstPortNumber
  | where array_length(set_DstIpAddr) > threshold  
queryFrequency: 1h
triggerThreshold: 0
eventGroupingSettings:
  aggregationKind: SingleAlert
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml
requiredDataConnectors:
- dataTypes:
  - AWSVPCFlow
  connectorId: AWSS3
- dataTypes:
  - DeviceNetworkEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - WindowsEvent
  connectorId: WindowsForwardedEvents
- dataTypes:
  - CommonSecurityLog
  connectorId: Zscaler
- dataTypes:
  - Syslog
  connectorId: MicrosoftSysmonForLinux
- dataTypes:
  - CommonSecurityLog
  connectorId: PaloAltoNetworks
- dataTypes:
  - VMConnection
  connectorId: AzureMonitor(VMInsights)
- dataTypes:
  - AzureDiagnostics
  connectorId: AzureFirewall
- dataTypes:
  - AzureDiagnostics
  connectorId: AzureNSG
- dataTypes:
  - CommonSecurityLog
  connectorId: CiscoASA
- dataTypes:
  - Corelight_CL
  connectorId: Corelight
- dataTypes:
  - VectraStream
  connectorId: AIVectraStream
- dataTypes:
  - CommonSecurityLog
  connectorId: CheckPoint
- dataTypes:
  - CommonSecurityLog
  connectorId: Fortinet
- dataTypes:
  - Syslog
  - CiscoMerakiNativePoller
  connectorId: CiscoMeraki
tags:
- SchemaVersion: 0.2.4
  Schema: ASimNetworkSessions
version: 1.0.2
relevantTechniques: 
severity: High

ARM

{
  "$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/cd8faa84-4464-4b4e-96dc-b22f50c27541')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/cd8faa84-4464-4b4e-96dc-b22f50c27541')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Network Port Sweep was detection by multiple IPs",
          "alertDisplayNameFormat": "Network Port Sweep detected on {{DstPortNumber}}"
        },
        "alertRuleTemplateName": "cd8faa84-4464-4b4e-96dc-b22f50c27541",
        "customDetails": {
          "AllDstIpAddr": "set_DstIpAddr"
        },
        "description": "'This detection rule detects scenarios when a particular port is being scanned by multiple external sources. The rule utilize [ASIM](https://aka.ms/AboutASIM) normalization, and is applied to any source which supports the ASIM Network Session schema.'\n",
        "displayName": "Network Port Sweep from External Network (ASIM Network Session schema)",
        "enabled": true,
        "entityMappings": null,
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml",
        "query": "let lookback = 1h;\nlet threshold = 20;\n_Im_NetworkSession(starttime=ago(lookback),endtime=now())\n| where NetworkDirection == \"Inbound\"\n| summarize make_set(DstIpAddr,100) by DstPortNumber\n| where array_length(set_DstIpAddr) > threshold\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery"
        ],
        "tags": [
          {
            "Schema": "ASimNetworkSessions",
            "SchemaVersion": "0.2.4"
          }
        ],
        "techniques": null,
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}