XbowNewAssetDiscovered

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Id	e4c6a8b2-9d7f-4285-a1e3-6b9c2e4f1a85
Rulename	XbowNewAssetDiscovered
Description	Alerts when a new asset is registered in XBOW for the first time. This is detected by matching assets whose CreatedAt timestamp falls within the current query window, indicating the asset was newly added rather than updated. This helps track shadow IT, new deployments, and any unexpected expansion of the external attack surface.
Severity	Medium
Tactics	Reconnaissance Discovery
Techniques	T1595
Required data connectors	XbowSecurityConnector
Kind	Scheduled
Query frequency	30m
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/XBOW/Analytic Rules/XbowNewAssetDiscovered.yaml
Version	1.0.0
Arm template	e4c6a8b2-9d7f-4285-a1e3-6b9c2e4f1a85.json

KQL

XbowAssets_CL
| where TimeGenerated > ago(1h)
// Only match assets created within the query window (new, not updated)
| where todatetime(CreatedAt) > ago(1h)
| summarize arg_max(TimeGenerated, *) by AssetId
| project
    TimeGenerated,
    AssetId,
    AssetName,
    StartUrl,
    Lifecycle,
    Sku,
    OrganizationId,
    CreatedAt,
    UpdatedAt,
    AssetReachableState,
    AssetReachableMessage

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/XBOW/Analytic Rules/XbowNewAssetDiscovered.yaml
query: |
  XbowAssets_CL
  | where TimeGenerated > ago(1h)
  // Only match assets created within the query window (new, not updated)
  | where todatetime(CreatedAt) > ago(1h)
  | summarize arg_max(TimeGenerated, *) by AssetId
  | project
      TimeGenerated,
      AssetId,
      AssetName,
      StartUrl,
      Lifecycle,
      Sku,
      OrganizationId,
      CreatedAt,
      UpdatedAt,
      AssetReachableState,
      AssetReachableMessage  
entityMappings:
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: StartUrl
kind: Scheduled
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - XbowAssets_CL
  connectorId: XbowSecurityConnector
tactics:
- Reconnaissance
- Discovery
triggerThreshold: 0
description: |
  Alerts when a new asset is registered in XBOW for the first time. This is detected by
  matching assets whose CreatedAt timestamp falls within the current query window,
  indicating the asset was newly added rather than updated. This helps track shadow IT,
  new deployments, and any unexpected expansion of the external attack surface.  
queryPeriod: 1h
version: 1.0.0
queryFrequency: 30m
severity: Medium
alertDetailsOverride:
  alertDisplayNameFormat: 'XBOW New Asset: {{AssetName}}'
  alertDescriptionFormat: 'New asset registered in XBOW: {{AssetName}} ({{StartUrl}}). Reachability: {{AssetReachableState}}'
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    groupByEntities: []
    reopenClosedIncident: false
    groupByAlertDetails: []
    matchingMethod: Selected
    lookbackDuration: 6h
    groupByCustomDetails:
    - AssetId
    enabled: true
customDetails:
  AssetReachableState: AssetReachableState
  Lifecycle: Lifecycle
  OrganizationId: OrganizationId
  Sku: Sku
  StartUrl: StartUrl
  AssetId: AssetId
  CreatedAt: CreatedAt
  AssetName: AssetName
name: XbowNewAssetDiscovered
id: e4c6a8b2-9d7f-4285-a1e3-6b9c2e4f1a85
eventGroupingSettings:
  aggregationKind: AlertPerResult
status: Available
relevantTechniques:
- T1595

ARM