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

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

ARM