PaloAlto - MAC address conflict

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Id	976d2eee-51cb-11ec-bf63-0242ac130002
Rulename	PaloAlto - MAC address conflict
Description	Detects several users with the same MAC address.
Severity	Low
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/PaloAltoCDLConflictingMacAddress.yaml
Version	1.0.3
Arm template	976d2eee-51cb-11ec-bf63-0242ac130002.json

KQL

let threshold = 2;
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where isnotempty(DestinationMACAddress) and isnotempty(DstUsername)
| summarize UserSet = make_set(DstUsername) by DestinationMACAddress
| extend Users = array_length(UserSet)
| where Users >= threshold
| extend AccountCustomEntity = UserSet, IPCustomEntity = DestinationMACAddress

YAML

version: 1.0.3
tactics:
- InitialAccess
relevantTechniques:
- T1190
- T1133
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
triggerThreshold: 0
name: PaloAlto - MAC address conflict
queryFrequency: 1h
triggerOperator: gt
kind: Scheduled
description: |
    'Detects several users with the same MAC address.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLConflictingMacAddress.yaml
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
severity: Low
query: |
  let threshold = 2;
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where isnotempty(DestinationMACAddress) and isnotempty(DstUsername)
  | summarize UserSet = make_set(DstUsername) by DestinationMACAddress
  | extend Users = array_length(UserSet)
  | where Users >= threshold
  | extend AccountCustomEntity = UserSet, IPCustomEntity = DestinationMACAddress  
queryPeriod: 1h
id: 976d2eee-51cb-11ec-bf63-0242ac130002
status: Available

ARM