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

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

ARM