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

id: cd8faa84-4464-4b4e-96dc-b22f50c27541
tags:
- SchemaVersion: 0.2.4
  Schema: ASimNetworkSessions
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/NetworkPortSweepFromExternalNetwork.yaml
eventGroupingSettings:
  aggregationKind: SingleAlert
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
queryFrequency: 1h
alertDetailsOverride:
  alertDisplayNameFormat: Network Port Sweep detected on {{DstPortNumber}}
  alertDescriptionFormat: Network Port Sweep was detection by multiple IPs
queryPeriod: 1h
status: Available
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  
name: Network Port Sweep from External Network (ASIM Network Session schema)
kind: Scheduled
tactics:
- Reconnaissance
- Discovery
severity: High
relevantTechniques:
- T1590
- T1046
triggerThreshold: 0
version: 1.0.5
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.'
customDetails:
  AllDstIpAddr: set_DstIpAddr

ARM