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	1.0.1
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

entityMappings:
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: StartUrl
tactics:
- Reconnaissance
- Discovery
requiredDataConnectors:
- dataTypes:
  - XbowAssets_CL
  connectorId: XbowSecurityConnector
alertDetailsOverride:
  alertDisplayNameFormat: 'XBOW New Asset: {{AssetName}}'
  alertDescriptionFormat: 'New asset registered in XBOW: {{AssetName}} ({{StartUrl}}). Reachability: {{AssetReachableState}}'
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: 6h
    groupByCustomDetails:
    - AssetID
    enabled: true
    matchingMethod: Selected
  createIncident: true
id: e4c6a8b2-9d7f-4285-a1e3-6b9c2e4f1a85
severity: Medium
eventGroupingSettings:
  aggregationKind: AlertPerResult
status: Available
customDetails:
  Lifecycle: Lifecycle
  AssetID: AssetId
  AssetName: AssetName
  OrganizationID: OrganizationId
  CreatedAt: CreatedAt
  Sku: Sku
  AssetReachableState: AssetReachableState
  StartUrl: StartUrl
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/XBOW/Analytic Rules/XbowNewAssetDiscovered.yaml
kind: Scheduled
queryPeriod: 1h
version: 1.0.1
name: XbowNewAssetDiscovered
queryFrequency: 30m
triggerThreshold: 0
relevantTechniques:
- T1595
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.  
triggerOperator: gt

ARM