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

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

ARM