Defender Alert Evidence

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Id	8138863e-e55f-4f02-ac94-72796e203d27
Rulename	Defender Alert Evidence
Description	This analytic rule is looking for new alert evidence from Microsoft Defender for Endpoint. The intent is to create entries in the SecurityAlert table for every new alert evidence attached to an entity of type Device or User monitored by Defender for Endpoint.
Severity	High
Tactics	Persistence
Techniques	T1546
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	60m
Query period	60m
Trigger threshold	0
Trigger operator	GreaterThan
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra XDR/Analytic Rules/Defender_Alert_Evidence.yaml
Version	1.0.0
Arm template	8138863e-e55f-4f02-ac94-72796e203d27.json

KQL

AlertEvidence
| where EntityType in ("Device", "User")

YAML

eventGroupingSettings:
  aggregationKind: SingleAlert
suppressionEnabled: false
incidentConfiguration:
  groupingConfiguration:
    enabled: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    reopenClosedIncident: false
  createIncident: false
suppressionDuration: PT5H
tactics:
- Persistence
name: Defender Alert Evidence
status: Available
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: LocalIP
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: DeviceName
    identifier: HostName
  entityType: Host
queryPeriod: 60m
version: 1.0.0
description: This analytic rule is looking for new alert evidence from Microsoft Defender for Endpoint. The intent is to create entries in the SecurityAlert table for every new alert evidence attached to an entity of type Device or User monitored by Defender for Endpoint.
severity: High
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra XDR/Analytic Rules/Defender_Alert_Evidence.yaml
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - AlertEvidence
queryFrequency: 60m
id: 8138863e-e55f-4f02-ac94-72796e203d27
type: Microsoft.OperationalInsights/workspaces/providers/alertRules
triggerThreshold: 0
query: |
  AlertEvidence
  | where EntityType in ("Device", "User")  
relevantTechniques:
- T1546
kind: Scheduled
triggerOperator: GreaterThan

ARM