Awake Security - High Match Counts By Device

CommonSecurityLog
| where DeviceVendor == "Arista Networks" and DeviceProduct == "Awake Security"
| summarize StartTime=min(TimeGenerated), EndTime=max(TimeGenerated), Models=make_set(Activity), ASPMatchURLs=make_set(DeviceCustomString2), SourceIPs=make_set(SourceIP),
  DestinationIPs=make_set(DestinationIP), ModelMatchCount=sum(EventCount), MaxSeverity=max(toint(LogSeverity)) by SourceHostName
| where ModelMatchCount > 1000 and MaxSeverity > 2
| extend SeverityName=iff(MaxSeverity == 0, "Informational", iff(MaxSeverity < 5, "Low", iff(MaxSeverity < 8, "Medium", "High")))

eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
severity: Medium
name: Awake Security - High Match Counts By Device
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SourceIPs
    identifier: Address
relevantTechniques: []
queryFrequency: 1h
triggerThreshold: 0
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: true
    matchingMethod: Selected
    groupByAlertDetails: []
    enabled: true
    lookbackDuration: 3d
    groupByCustomDetails:
    - Device
    groupByEntities:
    - Host
queryPeriod: 1h
description: This query searches for devices with unexpectedly large number of activity match.
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
alertDetailsOverride:
  alertTacticsColumnName: 
  alertSeverityColumnName: SeverityName
  alertDescriptionFormat: |-
    The following Awake model(s):

    {{Models}}

    matched {{ModelMatchCount}} activities, an unexpectedly large number. The destination IPs associated with these matches were:

    {{DestinationIPs}}    
  alertDisplayNameFormat: Awake Security - High Model Match Counts On Device {{SourceHostName}}
customDetails:
  Matches_Count: ModelMatchCount
  Matched_Models: Models
  Matches_Max_Severity: MaxSeverity
  Matches_ASP_URLs: ASPMatchURLs
  Device: SourceHostName
  Matches_Dest_IPs: DestinationIPs
version: 1.0.0
tactics: []
query: |
  CommonSecurityLog
  | where DeviceVendor == "Arista Networks" and DeviceProduct == "Awake Security"
  | summarize StartTime=min(TimeGenerated), EndTime=max(TimeGenerated), Models=make_set(Activity), ASPMatchURLs=make_set(DeviceCustomString2), SourceIPs=make_set(SourceIP),
    DestinationIPs=make_set(DestinationIP), ModelMatchCount=sum(EventCount), MaxSeverity=max(toint(LogSeverity)) by SourceHostName
  | where ModelMatchCount > 1000 and MaxSeverity > 2
  | extend SeverityName=iff(MaxSeverity == 0, "Informational", iff(MaxSeverity < 5, "Low", iff(MaxSeverity < 8, "Medium", "High")))  
status: Available
kind: Scheduled
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog (AwakeSecurity)
  connectorId: AristaAwakeSecurity
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/90b7ac11-dd6c-4ba1-a99b-737061873859')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/90b7ac11-dd6c-4ba1-a99b-737061873859')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Awake Security - High Match Counts By Device",
        "description": "This query searches for devices with unexpectedly large number of activity match.",
        "severity": "Medium",
        "enabled": true,
        "query": "CommonSecurityLog\n| where DeviceVendor == \"Arista Networks\" and DeviceProduct == \"Awake Security\"\n| summarize StartTime=min(TimeGenerated), EndTime=max(TimeGenerated), Models=make_set(Activity), ASPMatchURLs=make_set(DeviceCustomString2), SourceIPs=make_set(SourceIP),\n  DestinationIPs=make_set(DestinationIP), ModelMatchCount=sum(EventCount), MaxSeverity=max(toint(LogSeverity)) by SourceHostName\n| where ModelMatchCount > 1000 and MaxSeverity > 2\n| extend SeverityName=iff(MaxSeverity == 0, \"Informational\", iff(MaxSeverity < 5, \"Low\", iff(MaxSeverity < 8, \"Medium\", \"High\")))\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [],
        "techniques": [],
        "alertRuleTemplateName": "90b7ac11-dd6c-4ba1-a99b-737061873859",
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "reopenClosedIncident": true,
            "matchingMethod": "Selected",
            "groupByAlertDetails": [],
            "enabled": true,
            "lookbackDuration": "P3D",
            "groupByCustomDetails": [
              "Device"
            ],
            "groupByEntities": [
              "Host"
            ]
          }
        },
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "alertDetailsOverride": {
          "alertTacticsColumnName": null,
          "alertSeverityColumnName": "SeverityName",
          "alertDescriptionFormat": "The following Awake model(s):\n\n{{Models}}\n\nmatched {{ModelMatchCount}} activities, an unexpectedly large number. The destination IPs associated with these matches were:\n\n{{DestinationIPs}}",
          "alertDisplayNameFormat": "Awake Security - High Model Match Counts On Device {{SourceHostName}}"
        },
        "customDetails": {
          "Matches_Count": "ModelMatchCount",
          "Matched_Models": "Models",
          "Matches_Max_Severity": "MaxSeverity",
          "Matches_ASP_URLs": "ASPMatchURLs",
          "Device": "SourceHostName",
          "Matches_Dest_IPs": "DestinationIPs"
        },
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "HostName",
                "columnName": "SourceHostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "SourceIPs"
              }
            ]
          }
        ],
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml",
        "status": "Available"
      }
    }
  ]
}