PaloAlto - Inbound connection to high risk ports

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Id	b2dd2dac-51c9-11ec-bf63-0242ac130002
Rulename	PaloAlto - Inbound connection to high risk ports
Description	Detects inbound connection to high risk ports.
Severity	Medium
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	CefAma
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/PaloAltoCDL/Analytic Rules/PaloAltoCDLInboundRiskPorts.yaml
Version	1.0.3
Arm template	b2dd2dac-51c9-11ec-bf63-0242ac130002.json

KQL

let HighRiskPorts = dynamic(['21', '22', '23', '25', '53', '443', '110', '135', '137', '138', '139', '1433', '1434']);
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where ipv4_is_private(SrcIpAddr) == false
| where DstPortNumber in (HighRiskPorts)
| extend IPCustomEntity = SrcIpAddr

YAML

name: PaloAlto - Inbound connection to high risk ports
query: |
  let HighRiskPorts = dynamic(['21', '22', '23', '25', '53', '443', '110', '135', '137', '138', '139', '1433', '1434']);
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where ipv4_is_private(SrcIpAddr) == false
  | where DstPortNumber in (HighRiskPorts)
  | extend IPCustomEntity = SrcIpAddr  
queryFrequency: 1h
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
status: Available
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLInboundRiskPorts.yaml
description: |
    'Detects inbound connection to high risk ports.'
version: 1.0.3
id: b2dd2dac-51c9-11ec-bf63-0242ac130002
kind: Scheduled
relevantTechniques:
- T1190
- T1133
severity: Medium
tactics:
- InitialAccess
queryPeriod: 1h

ARM