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

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

ARM