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

customDetails:
  AllDstIpAddr: set_DstIpAddr
triggerOperator: gt
queryFrequency: 1h
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.'
alertDetailsOverride:
  alertDescriptionFormat: Network Port Sweep was detection by multiple IPs
  alertDisplayNameFormat: Network Port Sweep detected on {{DstPortNumber}}
status: Available
kind: Scheduled
triggerThreshold: 0
requiredDataConnectors:
- connectorId: AWSS3
  dataTypes:
  - AWSVPCFlow
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceNetworkEvents
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: WindowsForwardedEvents
  dataTypes:
  - WindowsEvent
- connectorId: Zscaler
  dataTypes:
  - CommonSecurityLog
- connectorId: MicrosoftSysmonForLinux
  dataTypes:
  - Syslog
- connectorId: PaloAltoNetworks
  dataTypes:
  - CommonSecurityLog
- connectorId: AzureMonitor(VMInsights)
  dataTypes:
  - VMConnection
- connectorId: AzureFirewall
  dataTypes:
  - AzureDiagnostics
- connectorId: AzureNSG
  dataTypes:
  - AzureDiagnostics
- connectorId: CiscoASA
  dataTypes:
  - CommonSecurityLog
- connectorId: Corelight
  dataTypes:
  - Corelight_CL
- connectorId: AIVectraStream
  dataTypes:
  - VectraStream
- connectorId: CheckPoint
  dataTypes:
  - CommonSecurityLog
- connectorId: Fortinet
  dataTypes:
  - CommonSecurityLog
- connectorId: CiscoMeraki
  dataTypes:
  - Syslog
  - CiscoMerakiNativePoller
version: 1.0.2
eventGroupingSettings:
  aggregationKind: SingleAlert
queryPeriod: 1h
name: Network Port Sweep from External Network (ASIM Network Session schema)
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml
id: cd8faa84-4464-4b4e-96dc-b22f50c27541
tags:
- Schema: ASimNetworkSessions
  SchemaVersion: 0.2.4
tactics:
- Discovery
relevantTechniques: 
severity: High
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

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"
    }
  ]
}