Awake Security - High Match Counts By Device

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Id	90b7ac11-dd6c-4ba1-a99b-737061873859
Rulename	Awake Security - High Match Counts By Device
Description	This query searches for devices with unexpectedly large number of activity match.
Severity	Medium
Required data connectors	AristaAwakeSecurity CefAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
Version	1.0.1
Arm template	90b7ac11-dd6c-4ba1-a99b-737061873859.json

KQL

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")))

YAML

alertDetailsOverride:
  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}}
  alertTacticsColumnName: 
  alertSeverityColumnName: SeverityName
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SourceIPs
    identifier: Address
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")))  
relevantTechniques: []
eventGroupingSettings:
  aggregationKind: AlertPerResult
triggerOperator: gt
triggerThreshold: 0
queryPeriod: 1h
customDetails:
  Matched_Models: Models
  Matches_Count: ModelMatchCount
  Device: SourceHostName
  Matches_Dest_IPs: DestinationIPs
  Matches_Max_Severity: MaxSeverity
  Matches_ASP_URLs: ASPMatchURLs
tactics: []
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog (AwakeSecurity)
  connectorId: AristaAwakeSecurity
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
kind: Scheduled
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: true
    enabled: true
    groupByEntities:
    - Host
    lookbackDuration: 3d
    groupByCustomDetails:
    - Device
    matchingMethod: Selected
    groupByAlertDetails: []
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
description: This query searches for devices with unexpectedly large number of activity match.
queryFrequency: 1h
name: Awake Security - High Match Counts By Device
severity: Medium
version: 1.0.1
status: Available

ARM

{
  "$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": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}