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
triggerThreshold: 0
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: LocalIP
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: DeviceName
requiredDataConnectors:
- dataTypes:
  - AlertEvidence
  connectorId: MicrosoftThreatProtection
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra XDR/Analytic Rules/Defender_Alert_Evidence.yaml
suppressionEnabled: false
incidentConfiguration:
  createIncident: false
  groupingConfiguration:
    enabled: false
    reopenClosedIncident: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
queryPeriod: 60m
relevantTechniques:
- T1546
status: Available
version: 1.0.0
severity: High
type: Microsoft.OperationalInsights/workspaces/providers/alertRules
kind: Scheduled
id: 8138863e-e55f-4f02-ac94-72796e203d27
query: |
  AlertEvidence
  | where EntityType in ("Device", "User")  
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.
queryFrequency: 60m
name: Defender Alert Evidence
triggerOperator: GreaterThan
tactics:
- Persistence
suppressionDuration: PT5H

ARM