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

queryPeriod: 1h
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  
name: PaloAlto - MAC address conflict
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLConflictingMacAddress.yaml
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
description: |
    'Detects several users with the same MAC address.'
kind: Scheduled
version: 1.0.3
status: Available
severity: Low
relevantTechniques:
- T1190
- T1133
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: 976d2eee-51cb-11ec-bf63-0242ac130002

ARM