Microsoft Sentinel Analytic Rules
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Awake Security - High Match Counts By Device

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Id90b7ac11-dd6c-4ba1-a99b-737061873859
RulenameAwake Security - High Match Counts By Device
DescriptionThis query searches for devices with unexpectedly large number of activity match.
SeverityMedium
Required data connectorsCefAma
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
Version1.0.2
Arm template90b7ac11-dd6c-4ba1-a99b-737061873859.json
Deploy To Azure
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")))
entityMappings:
- fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
  entityType: Host
- fieldMappings:
  - columnName: SourceIPs
    identifier: Address
  entityType: IP
triggerThreshold: 0
severity: Medium
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    matchingMethod: Selected
    reopenClosedIncident: true
    groupByEntities:
    - Host
    lookbackDuration: 3d
    groupByCustomDetails:
    - Device
    groupByAlertDetails: []
queryFrequency: 1h
status: Available
customDetails:
  Matches_Max_Severity: MaxSeverity
  Matches_Dest_IPs: DestinationIPs
  Matches_Count: ModelMatchCount
  Matches_ASP_URLs: ASPMatchURLs
  Device: SourceHostName
  Matched_Models: Models
relevantTechniques: []
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
triggerOperator: gt
version: 1.0.2
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
alertDetailsOverride:
  alertTacticsColumnName: 
  alertDisplayNameFormat: Awake Security - High Model Match Counts On Device {{SourceHostName}}
  alertDescriptionFormat: |-
    The following Awake model(s):

    {{Models}}

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

    {{DestinationIPs}}    
  alertSeverityColumnName: SeverityName
name: Awake Security - High Match Counts By Device
eventGroupingSettings:
  aggregationKind: AlertPerResult
description: This query searches for devices with unexpectedly large number of activity match.
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")))  
tactics: []
queryPeriod: 1h
kind: Scheduled
{
  "$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/90b7ac11-dd6c-4ba1-a99b-737061873859')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/90b7ac11-dd6c-4ba1-a99b-737061873859')]",
      "properties": {
        "alertDetailsOverride": {
          "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}}",
          "alertSeverityColumnName": "SeverityName",
          "alertTacticsColumnName": null
        },
        "alertRuleTemplateName": "90b7ac11-dd6c-4ba1-a99b-737061873859",
        "customDetails": {
          "Device": "SourceHostName",
          "Matched_Models": "Models",
          "Matches_ASP_URLs": "ASPMatchURLs",
          "Matches_Count": "ModelMatchCount",
          "Matches_Dest_IPs": "DestinationIPs",
          "Matches_Max_Severity": "MaxSeverity"
        },
        "description": "This query searches for devices with unexpectedly large number of activity match.",
        "displayName": "Awake Security - High Match Counts By Device",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "SourceHostName",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIPs",
                "identifier": "Address"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "groupByAlertDetails": [],
            "groupByCustomDetails": [
              "Device"
            ],
            "groupByEntities": [
              "Host"
            ],
            "lookbackDuration": "P3D",
            "matchingMethod": "Selected",
            "reopenClosedIncident": true
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml",
        "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",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [],
        "techniques": [],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}