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

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

ARM