SOCRadar Alarm Volume Spike

let baseline = SOCRadar_Alarms_CL
| where TimeGenerated > ago(7d) and TimeGenerated < ago(1h)
| summarize AvgHourly = count() / 168.0;
let recent = SOCRadar_Alarms_CL
| where TimeGenerated > ago(1h)
| summarize RecentCount = count() by AlarmMainType;
recent
| extend BaselineAvg = toscalar(baseline)
| where RecentCount > (BaselineAvg * 3) and RecentCount > 5
| extend SpikeRatio = round(RecentCount / BaselineAvg, 2)
| extend timestamp = now()
| extend AccountName = AlarmMainType

name: SOCRadar Alarm Volume Spike
triggerOperator: gt
query: |
  let baseline = SOCRadar_Alarms_CL
  | where TimeGenerated > ago(7d) and TimeGenerated < ago(1h)
  | summarize AvgHourly = count() / 168.0;
  let recent = SOCRadar_Alarms_CL
  | where TimeGenerated > ago(1h)
  | summarize RecentCount = count() by AlarmMainType;
  recent
  | extend BaselineAvg = toscalar(baseline)
  | where RecentCount > (BaselineAvg * 3) and RecentCount > 5
  | extend SpikeRatio = round(RecentCount / BaselineAvg, 2)
  | extend timestamp = now()
  | extend AccountName = AlarmMainType
queryFrequency: 1h
description: |
  'Detects unusual spikes in SOCRadar alarm volume that may indicate an active campaign, coordinated attack, or data breach. Triggers when alarm count in the last hour exceeds the 7-day hourly average by more than 3x.'
id: 4a7b3c9e-2d15-4e8f-b6a3-9c2e7d5a1b4f
triggerThreshold: 0
queryPeriod: 7d
version: 1.0.0
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors: []
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SOCRadar/Analytic%20Rules/SOCRadarAlarmVolumeSpike.yaml
relevantTechniques:
- T1485
- T1567
tactics:
- Impact
- Exfiltration
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  entityType: Malware

{
  "$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/4a7b3c9e-2d15-4e8f-b6a3-9c2e7d5a1b4f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4a7b3c9e-2d15-4e8f-b6a3-9c2e7d5a1b4f')]",
      "properties": {
        "alertRuleTemplateName": "4a7b3c9e-2d15-4e8f-b6a3-9c2e7d5a1b4f",
        "customDetails": null,
        "description": "'Detects unusual spikes in SOCRadar alarm volume that may indicate an active campaign, coordinated attack, or data breach. Triggers when alarm count in the last hour exceeds the 7-day hourly average by more than 3x.'\n",
        "displayName": "SOCRadar Alarm Volume Spike",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Malware",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SOCRadar/Analytic%20Rules/SOCRadarAlarmVolumeSpike.yaml",
        "query": "let baseline = SOCRadar_Alarms_CL\n| where TimeGenerated > ago(7d) and TimeGenerated < ago(1h)\n| summarize AvgHourly = count() / 168.0;\nlet recent = SOCRadar_Alarms_CL\n| where TimeGenerated > ago(1h)\n| summarize RecentCount = count() by AlarmMainType;\nrecent\n| extend BaselineAvg = toscalar(baseline)\n| where RecentCount > (BaselineAvg * 3) and RecentCount > 5\n| extend SpikeRatio = round(RecentCount / BaselineAvg, 2)\n| extend timestamp = now()\n| extend AccountName = AlarmMainType\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P7D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration",
          "Impact"
        ],
        "techniques": [
          "T1485",
          "T1567"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}