Vectra Host's Behaviors

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Id	33e3b6da-2660-4cd7-9032-11be76db88d2
Rulename	Vectra Host’s Behaviors
Description	This analytic rule is looking for new attacker behaviors observed by the Vectra Platform. This rule is focused on host’s detections.
Severity	Informational
Tactics	CredentialAccess Discovery LateralMovement Collection CommandAndControl Exfiltration Impact
Required data connectors	AIVectraDetect
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Host-Detections.yaml
Version	1.0.1
Arm template	33e3b6da-2660-4cd7-9032-11be76db88d2.json

KQL

CommonSecurityLog
| where DeviceVendor == "Vectra Networks"
| where DeviceProduct == "X Series"
| where DeviceEventClassID != "campaigns"
    and DeviceEventClassID != "hsc"
    and DeviceEventClassID != "audit"
    and DeviceEventClassID != "health"
    and DeviceEventClassID != "asc"
| extend Category = coalesce(
    column_ifexists("DeviceEventCategory", ""), 
    extract("cat=(.+?)(;|$)", 1, AdditionalExtensions), 
    ""
    )
| project-rename threat_score = FlexNumber1
| project-rename certainty_score = FlexNumber2
| project-rename vectra_URL = DeviceCustomString4
| project-rename detection_name = DeviceEventClassID
| project-rename triaged = DeviceCustomString5
| where triaged != "True" and AdditionalExtensions !has "account"
| extend source_entity = case(isnotempty(SourceHostName), SourceHostName,
    "UNKNWON")
| extend level = case(threat_score == 0 and certainty_score == 0, "Info",
    threat_score < 50 and certainty_score < 50, "Low",
    threat_score < 50 and certainty_score >= 50, "Medium", 
    threat_score >= 50 and certainty_score <= 50, "High", 
    threat_score >= 50 and certainty_score >= 50, "Critical",
    "UNKNOWN")
| extend Severity = case(level == "Info", "Informational",level == "Critical", "High", level)
| summarize arg_max(threat_score, *) by source_entity, Activity
| sort by TimeGenerated

YAML

triggerThreshold: 0
queryFrequency: 5m
relevantTechniques: 
tactics:
- CredentialAccess
- Discovery
- LateralMovement
- Collection
- CommandAndControl
- Exfiltration
- Impact
id: 33e3b6da-2660-4cd7-9032-11be76db88d2
alertDetailsOverride:
  alertDynamicProperties:
  - value: vectra_URL
    alertProperty: AlertLink
  - value: DeviceProduct
    alertProperty: ProductName
  - value: DeviceVendor
    alertProperty: ProviderName
  - value: certainty_score
    alertProperty: ConfidenceScore
  alertSeverityColumnName: Severity
  alertDescriptionFormat: |
        Entity is a host. Category is {{Category}}. Threat score is {{threat_score}} and certainty score is {{certainty_score}}.
  alertDisplayNameFormat: Vectra AI - {{Activity}} Detected
kind: Scheduled
triggerOperator: gt
severity: Informational
customDetails:
  AttackType: Activity
  AttackCategory: Category
eventGroupingSettings:
  aggregationKind: AlertPerResult
requiredDataConnectors:
- connectorId: AIVectraDetect
  dataTypes:
  - CommonSecurityLog
query: |
  CommonSecurityLog
  | where DeviceVendor == "Vectra Networks"
  | where DeviceProduct == "X Series"
  | where DeviceEventClassID != "campaigns"
      and DeviceEventClassID != "hsc"
      and DeviceEventClassID != "audit"
      and DeviceEventClassID != "health"
      and DeviceEventClassID != "asc"
  | extend Category = coalesce(
      column_ifexists("DeviceEventCategory", ""), 
      extract("cat=(.+?)(;|$)", 1, AdditionalExtensions), 
      ""
      )
  | project-rename threat_score = FlexNumber1
  | project-rename certainty_score = FlexNumber2
  | project-rename vectra_URL = DeviceCustomString4
  | project-rename detection_name = DeviceEventClassID
  | project-rename triaged = DeviceCustomString5
  | where triaged != "True" and AdditionalExtensions !has "account"
  | extend source_entity = case(isnotempty(SourceHostName), SourceHostName,
      "UNKNWON")
  | extend level = case(threat_score == 0 and certainty_score == 0, "Info",
      threat_score < 50 and certainty_score < 50, "Low",
      threat_score < 50 and certainty_score >= 50, "Medium", 
      threat_score >= 50 and certainty_score <= 50, "High", 
      threat_score >= 50 and certainty_score >= 50, "Critical",
      "UNKNOWN")
  | extend Severity = case(level == "Info", "Informational",level == "Critical", "High", level)
  | summarize arg_max(threat_score, *) by source_entity, Activity
  | sort by TimeGenerated  
entityMappings:
- fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
  entityType: Host
version: 1.0.1
queryPeriod: 5m
name: Vectra Host's Behaviors
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Host-Detections.yaml
status: Available
description: |
    'This analytic rule is looking for new attacker behaviors observed by the Vectra Platform. This rule is focused on host's detections.'

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/33e3b6da-2660-4cd7-9032-11be76db88d2')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/33e3b6da-2660-4cd7-9032-11be76db88d2')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Vectra Host's Behaviors",
        "description": "'This analytic rule is looking for new attacker behaviors observed by the Vectra Platform. This rule is focused on host's detections.'\n",
        "severity": "Informational",
        "enabled": true,
        "query": "CommonSecurityLog\n| where DeviceVendor == \"Vectra Networks\"\n| where DeviceProduct == \"X Series\"\n| where DeviceEventClassID != \"campaigns\"\n    and DeviceEventClassID != \"hsc\"\n    and DeviceEventClassID != \"audit\"\n    and DeviceEventClassID != \"health\"\n    and DeviceEventClassID != \"asc\"\n| extend Category = coalesce(\n    column_ifexists(\"DeviceEventCategory\", \"\"), \n    extract(\"cat=(.+?)(;|$)\", 1, AdditionalExtensions), \n    \"\"\n    )\n| project-rename threat_score = FlexNumber1\n| project-rename certainty_score = FlexNumber2\n| project-rename vectra_URL = DeviceCustomString4\n| project-rename detection_name = DeviceEventClassID\n| project-rename triaged = DeviceCustomString5\n| where triaged != \"True\" and AdditionalExtensions !has \"account\"\n| extend source_entity = case(isnotempty(SourceHostName), SourceHostName,\n    \"UNKNWON\")\n| extend level = case(threat_score == 0 and certainty_score == 0, \"Info\",\n    threat_score < 50 and certainty_score < 50, \"Low\",\n    threat_score < 50 and certainty_score >= 50, \"Medium\", \n    threat_score >= 50 and certainty_score <= 50, \"High\", \n    threat_score >= 50 and certainty_score >= 50, \"Critical\",\n    \"UNKNOWN\")\n| extend Severity = case(level == \"Info\", \"Informational\",level == \"Critical\", \"High\", level)\n| summarize arg_max(threat_score, *) by source_entity, Activity\n| sort by TimeGenerated\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Discovery",
          "LateralMovement",
          "Collection",
          "CommandAndControl",
          "Exfiltration",
          "Impact"
        ],
        "techniques": null,
        "alertRuleTemplateName": "33e3b6da-2660-4cd7-9032-11be76db88d2",
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "alertDetailsOverride": {
          "alertDynamicProperties": [
            {
              "alertProperty": "AlertLink",
              "value": "vectra_URL"
            },
            {
              "alertProperty": "ProductName",
              "value": "DeviceProduct"
            },
            {
              "alertProperty": "ProviderName",
              "value": "DeviceVendor"
            },
            {
              "alertProperty": "ConfidenceScore",
              "value": "certainty_score"
            }
          ],
          "alertSeverityColumnName": "Severity",
          "alertDescriptionFormat": "Entity is a host. Category is {{Category}}. Threat score is {{threat_score}} and certainty score is {{certainty_score}}.\n",
          "alertDisplayNameFormat": "Vectra AI - {{Activity}} Detected"
        },
        "customDetails": {
          "AttackCategory": "Category",
          "AttackType": "Activity"
        },
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "SourceHostName",
                "identifier": "HostName"
              }
            ],
            "entityType": "Host"
          }
        ],
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vectra AI Detect/Analytic Rules/VectraDetect-Host-Detections.yaml",
        "status": "Available"
      }
    }
  ]
}