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

id: e4c6a8b2-9d7f-4285-a1e3-6b9c2e4f1a85
triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: Url
    columnName: StartUrl
  entityType: URL
eventGroupingSettings:
  aggregationKind: AlertPerResult
requiredDataConnectors:
- dataTypes:
  - XbowAssets_CL
  connectorId: XbowSecurityConnector
queryFrequency: 30m
alertDetailsOverride:
  alertDisplayNameFormat: 'XBOW New Asset: {{AssetName}}'
  alertDescriptionFormat: 'New asset registered in XBOW: {{AssetName}} ({{StartUrl}}). Reachability: {{AssetReachableState}}'
queryPeriod: 1h
status: Available
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: 6h
    groupByAlertDetails: []
    reopenClosedIncident: false
    matchingMethod: Selected
    groupByCustomDetails:
    - AssetId
    groupByEntities: []
    enabled: true
  createIncident: true
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  
name: XbowNewAssetDiscovered
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/XBOW/Analytic Rules/XbowNewAssetDiscovered.yaml
tactics:
- Reconnaissance
- Discovery
severity: Medium
relevantTechniques:
- T1595
triggerThreshold: 0
version: 1.0.0
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.  
customDetails:
  StartUrl: StartUrl
  AssetId: AssetId
  CreatedAt: CreatedAt
  Lifecycle: Lifecycle
  AssetName: AssetName
  Sku: Sku
  OrganizationId: OrganizationId
  AssetReachableState: AssetReachableState

ARM