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

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLInboundRiskPorts.yaml
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  
version: 1.0.3
queryFrequency: 1h
id: b2dd2dac-51c9-11ec-bf63-0242ac130002
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
name: PaloAlto - Inbound connection to high risk ports
description: |
    'Detects inbound connection to high risk ports.'
tactics:
- InitialAccess
triggerOperator: gt
queryPeriod: 1h
kind: Scheduled
status: Available
severity: Medium
relevantTechniques:
- T1190
- T1133
triggerThreshold: 0
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address

ARM