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

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

ARM