{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/1c08a7cb-7ff4-5a37-a961-39c29f8d07bd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/1c08a7cb-7ff4-5a37-a961-39c29f8d07bd')]",
      "properties": {
        "alertRuleTemplateName": "1c08a7cb-7ff4-5a37-a961-39c29f8d07bd",
        "customDetails": {
          "OriginASN": "OriginASN",
          "Prefix": "Prefix",
          "TrafficChange": "TrafficChange"
        },
        "description": "Detects BGP origin AS changes for IP prefixes correlated with network traffic volume spikes. May indicate BGP hijacking or adversary-in-the-middle attacks.\n",
        "displayName": "Whisper Security - BGP Route Anomaly with Traffic Spike",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Whisper/Analytic%20Rules/BgpRouteAnomalyTrafficSpike.yaml",
        "query": "// MITRE ATT&CK: T1557 - Adversary-in-the-Middle\n// Tactic: Collection\n// Detects BGP route origin changes correlated with traffic volume anomalies\nlet lookbackPeriod = 1d;\nlet bgpChanges = WhisperHistory_CL\n    | where TimeGenerated > ago(lookbackPeriod)\n    | where isnotempty(bgpOrigin)\n    | serialize\n    | extend PreviousOrigin = prev(bgpOrigin), PreviousIndicator = prev(indicator)\n    | where indicator == PreviousIndicator\n    | where bgpOrigin != PreviousOrigin\n    | where isnotempty(PreviousOrigin)\n    | project indicator, bgpPrefix, OldOrigin = PreviousOrigin, NewOrigin = bgpOrigin, ChangeTime = snapshotDate;\nlet CommonSecurityLogSafe = union isfuzzy=true CommonSecurityLog, (datatable(TimeGenerated:datetime, DestinationIP:string, SentBytes:long, ReceivedBytes:long)[]);\nlet trafficBaseline = CommonSecurityLogSafe\n    | where TimeGenerated > ago(lookbackPeriod)\n    | where isnotempty(DestinationIP)\n    | summarize BaselineBytes = avg(SentBytes + ReceivedBytes), BaselineCount = count() by DestinationIP, bin(TimeGenerated, 1h)\n    | summarize AvgBaselineBytes = avg(BaselineBytes), AvgBaselineCount = avg(BaselineCount) by DestinationIP;\nlet recentTraffic = CommonSecurityLogSafe\n    | where TimeGenerated > ago(15m)\n    | where isnotempty(DestinationIP)\n    | summarize RecentBytes = sum(SentBytes + ReceivedBytes), RecentCount = count() by DestinationIP;\nrecentTraffic\n    | join kind=inner (trafficBaseline) on DestinationIP\n    | where RecentBytes > AvgBaselineBytes * 3 or RecentCount > AvgBaselineCount * 3\n    | extend TrafficChange = iff(AvgBaselineBytes > 0, round((RecentBytes - AvgBaselineBytes) / AvgBaselineBytes * 100, 2), 0.0)\n    | join kind=inner (bgpChanges) on $left.DestinationIP == $right.indicator\n    | project TimeGenerated = ChangeTime, IPAddress = DestinationIP, Prefix = bgpPrefix, OriginASN = NewOrigin, OldOriginASN = OldOrigin, TrafficChange, RecentBytes, AvgBaselineBytes\n",
        "queryFrequency": "PT15M",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection"
        ],
        "techniques": [
          "T1557"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}