Cisco Duo - Unexpected authentication factor

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Id	16c91a2c-17ad-4985-a9ad-4a4f1cb11830
Rulename	Cisco Duo - Unexpected authentication factor
Description	Detects when unexpected authentication factor used.
Severity	Medium
Tactics	InitialAccess
Techniques	T1078
Required data connectors	CiscoDuoSecurity
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/CiscoDuoSecurity/Analytic Rules/CiscoDuoUnexpectedAuthFactor.yaml
Version	1.0.0
Arm template	16c91a2c-17ad-4985-a9ad-4a4f1cb11830.json

KQL

let allowed_auth_f = dynamic(['duo_push', 'duo_mobile_passcode']);
CiscoDuo
| where EventType =~ 'authentication'
| where EventResult =~ 'success'
| where AuthFactor !in~ (allowed_auth_f)
| extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = DstUserName

YAML

triggerThreshold: 0
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
requiredDataConnectors:
- dataTypes:
  - CiscoDuo
  connectorId: CiscoDuoSecurity
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoDuoSecurity/Analytic Rules/CiscoDuoUnexpectedAuthFactor.yaml
name: Cisco Duo - Unexpected authentication factor
relevantTechniques:
- T1078
status: Available
version: 1.0.0
queryPeriod: 1h
kind: Scheduled
id: 16c91a2c-17ad-4985-a9ad-4a4f1cb11830
query: |
  let allowed_auth_f = dynamic(['duo_push', 'duo_mobile_passcode']);
  CiscoDuo
  | where EventType =~ 'authentication'
  | where EventResult =~ 'success'
  | where AuthFactor !in~ (allowed_auth_f)
  | extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = DstUserName  
description: |
    'Detects when unexpected authentication factor used.'
queryFrequency: 1h
severity: Medium
triggerOperator: gt
tactics:
- InitialAccess

ARM