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	Reconnaissance Discovery
Techniques	T1590 T1046
Required data connectors	AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoAsaAma CiscoMeraki Corelight Fortinet MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents WindowsForwardedEvents WindowsSecurityEvents 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	1.0.5
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 SrcIpAddr, DstPortNumber
| where array_length(set_DstIpAddr) > threshold

YAML

kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
alertDetailsOverride:
  alertDisplayNameFormat: Network Port Sweep detected on {{DstPortNumber}}
  alertDescriptionFormat: Network Port Sweep was detection by multiple IPs
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.'
severity: High
queryFrequency: 1h
customDetails:
  AllDstIpAddr: set_DstIpAddr
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - AWSVPCFlow
  connectorId: AWSS3
- dataTypes:
  - DeviceNetworkEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
- 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:
  - CommonSecurityLog
  connectorId: CiscoAsaAma
- dataTypes:
  - Corelight_CL
  connectorId: Corelight
- dataTypes:
  - VectraStream
  connectorId: AIVectraStream
- dataTypes:
  - CommonSecurityLog
  connectorId: CheckPoint
- dataTypes:
  - CommonSecurityLog
  connectorId: Fortinet
- dataTypes:
  - Syslog
  - CiscoMerakiNativePoller
  connectorId: CiscoMeraki
relevantTechniques:
- T1590
- T1046
status: Available
tactics:
- Reconnaissance
- Discovery
name: Network Port Sweep from External Network (ASIM Network Session schema)
id: cd8faa84-4464-4b4e-96dc-b22f50c27541
query: |
  let lookback = 1h;
  let threshold = 20;
  _Im_NetworkSession(starttime=ago(lookback),endtime=now())
  | where NetworkDirection == "Inbound"
  | summarize make_set(DstIpAddr,100) by SrcIpAddr, DstPortNumber
  | where array_length(set_DstIpAddr) > threshold  
tags:
- Schema: ASimNetworkSessions
  SchemaVersion: 0.2.4
version: 1.0.5
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml
queryPeriod: 1h

ARM

{
  "$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/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 SrcIpAddr, DstPortNumber\n| where array_length(set_DstIpAddr) > threshold\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery",
          "Reconnaissance"
        ],
        "tags": [
          {
            "Schema": "ASimNetworkSessions",
            "SchemaVersion": "0.2.4"
          }
        ],
        "techniques": [
          "T1046",
          "T1590"
        ],
        "templateVersion": "1.0.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}