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
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	1.0.0
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

queryFrequency: 1h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SourceIPs
    identifier: Address
severity: Medium
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
relevantTechniques: []
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")))  
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
triggerOperator: gt
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    groupByAlertDetails: []
    groupByEntities:
    - Host
    reopenClosedIncident: true
    enabled: true
    lookbackDuration: 3d
    matchingMethod: Selected
    groupByCustomDetails:
    - Device
requiredDataConnectors:
- connectorId: AristaAwakeSecurity
  dataTypes:
  - CommonSecurityLog (AwakeSecurity)
eventGroupingSettings:
  aggregationKind: AlertPerResult
customDetails:
  Matches_ASP_URLs: ASPMatchURLs
  Device: SourceHostName
  Matches_Max_Severity: MaxSeverity
  Matched_Models: Models
  Matches_Dest_IPs: DestinationIPs
  Matches_Count: ModelMatchCount
description: This query searches for devices with unexpectedly large number of activity match.
queryPeriod: 1h
alertDetailsOverride:
  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}}    
  alertTacticsColumnName: 
  alertDisplayNameFormat: Awake Security - High Model Match Counts On Device {{SourceHostName}}
status: Available
name: Awake Security - High Match Counts By Device
version: 1.0.0
tactics: []
kind: Scheduled

ARM

{
  "$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",
      "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": {
          "groupingConfiguration": {
            "groupByAlertDetails": [],
            "groupByEntities": [
              "Host"
            ],
            "lookbackDuration": "P3D",
            "groupByCustomDetails": [
              "Device"
            ],
            "reopenClosedIncident": true,
            "enabled": true,
            "matchingMethod": "Selected"
          },
          "createIncident": true
        },
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "alertDetailsOverride": {
          "alertSeverityColumnName": "SeverityName",
          "alertDisplayNameFormat": "Awake Security - High Model Match Counts On Device {{SourceHostName}}",
          "alertTacticsColumnName": null,
          "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}}"
        },
        "customDetails": {
          "Matches_Dest_IPs": "DestinationIPs",
          "Device": "SourceHostName",
          "Matches_ASP_URLs": "ASPMatchURLs",
          "Matches_Max_Severity": "MaxSeverity",
          "Matched_Models": "Models",
          "Matches_Count": "ModelMatchCount"
        },
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "HostName",
                "columnName": "SourceHostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "SourceIPs"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}