Vaikora - High score quarantine | Microsoft Sentinel Analytic Rules

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Id	017031f6-be1d-4c68-b4d3-182fa84378cc
Rulename	Vaikora - High score quarantine
Description	Identifies high-confidence phishing or suspected-threat quarantine events from Vaikora for O365. Fires when the classifier returns action_id 4 (Suspected) or 5 (Phishing) with confidence above 0.8 on a Microsoft 365 mailbox.
Severity	High
Tactics	InitialAccess CredentialAccess Collection Exfiltration
Techniques	T1566 T1566.001 T1566.002
Required data connectors	VaikoraO365
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-O365/Analytic%20Rules/Vaikora%20-%20High%20score%20quarantine.yaml
Version	1.0.0
Arm template	017031f6-be1d-4c68-b4d3-182fa84378cc.json

KQL

VaikoraO365_Quarantine_CL
| where TimeGenerated >= ago(15m)
| where ActionId_d in (4, 5)
| where Confidence_d >= 0.8
| extend
    EmailId          = EmailId_s,
    TenantId         = TenantId_s,
    ActionId         = ActionId_d,
    ActionName       = ActionName_s,
    Confidence       = Confidence_d,
    RiskScore        = RiskScore_d,
    SubCategory      = SubCategory_s,
    Reasoning        = Reasoning_s,
    SourceMailbox    = SourceMailbox_s,
    SenderAddress    = SenderAddress_s,
    SenderDomain     = SenderDomain_s,
    Subject          = Subject_s,
    RecipientAddress = RecipientAddress_s,
    ModelVersion     = ModelVersion_s
| project
    TimeGenerated, EmailId, TenantId, ActionId, ActionName, Confidence, RiskScore,
    SubCategory, Reasoning, SourceMailbox, SenderAddress, SenderDomain, Subject,
    RecipientAddress, ModelVersion
| order by TimeGenerated desc

YAML

requiredDataConnectors:
- dataTypes:
  - VaikoraO365_Quarantine_CL
  connectorId: VaikoraO365
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-O365/Analytic%20Rules/Vaikora%20-%20High%20score%20quarantine.yaml
version: 1.0.0
status: Available
alertDetailsOverride:
  alertDescriptionFormat: Vaikora-O365 classified this message as {{ActionName}} with confidence {{Confidence}}. The message was quarantined from the recipient mailbox.
  alertDisplayNameFormat: Vaikora-O365 {{ActionName}} on {{RecipientAddress}}
queryFrequency: 15m
query: |
  VaikoraO365_Quarantine_CL
  | where TimeGenerated >= ago(15m)
  | where ActionId_d in (4, 5)
  | where Confidence_d >= 0.8
  | extend
      EmailId          = EmailId_s,
      TenantId         = TenantId_s,
      ActionId         = ActionId_d,
      ActionName       = ActionName_s,
      Confidence       = Confidence_d,
      RiskScore        = RiskScore_d,
      SubCategory      = SubCategory_s,
      Reasoning        = Reasoning_s,
      SourceMailbox    = SourceMailbox_s,
      SenderAddress    = SenderAddress_s,
      SenderDomain     = SenderDomain_s,
      Subject          = Subject_s,
      RecipientAddress = RecipientAddress_s,
      ModelVersion     = ModelVersion_s
  | project
      TimeGenerated, EmailId, TenantId, ActionId, ActionName, Confidence, RiskScore,
      SubCategory, Reasoning, SourceMailbox, SenderAddress, SenderDomain, Subject,
      RecipientAddress, ModelVersion
  | order by TimeGenerated desc
tactics:
- InitialAccess
- CredentialAccess
- Collection
- Exfiltration
relevantTechniques:
- T1566
- T1566.001
- T1566.002
id: 017031f6-be1d-4c68-b4d3-182fa84378cc
triggerThreshold: 0
triggerOperator: gt
name: Vaikora - High score quarantine
queryPeriod: 15m
severity: High
entityMappings:
- fieldMappings:
  - columnName: RecipientAddress
    identifier: Recipient
  - columnName: EmailId
    identifier: NetworkMessageId
  entityType: MailMessage
- fieldMappings:
  - columnName: SenderAddress
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: RecipientAddress
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: SenderDomain
    identifier: DomainName
  entityType: DNS
kind: Scheduled
description: |
  Identifies high-confidence phishing or suspected-threat quarantine events from Vaikora for O365. Fires when the classifier returns action_id 4 (Suspected) or 5 (Phishing) with confidence above 0.8 on a Microsoft 365 mailbox.

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/017031f6-be1d-4c68-b4d3-182fa84378cc')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/017031f6-be1d-4c68-b4d3-182fa84378cc')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Vaikora-O365 classified this message as {{ActionName}} with confidence {{Confidence}}. The message was quarantined from the recipient mailbox.",
          "alertDisplayNameFormat": "Vaikora-O365 {{ActionName}} on {{RecipientAddress}}"
        },
        "alertRuleTemplateName": "017031f6-be1d-4c68-b4d3-182fa84378cc",
        "customDetails": null,
        "description": "Identifies high-confidence phishing or suspected-threat quarantine events from Vaikora for O365. Fires when the classifier returns action_id 4 (Suspected) or 5 (Phishing) with confidence above 0.8 on a Microsoft 365 mailbox.\n",
        "displayName": "Vaikora - High score quarantine",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "RecipientAddress",
                "identifier": "Recipient"
              },
              {
                "columnName": "EmailId",
                "identifier": "NetworkMessageId"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "SenderAddress",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "RecipientAddress",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "SenderDomain",
                "identifier": "DomainName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-O365/Analytic%20Rules/Vaikora%20-%20High%20score%20quarantine.yaml",
        "query": "VaikoraO365_Quarantine_CL\n| where TimeGenerated >= ago(15m)\n| where ActionId_d in (4, 5)\n| where Confidence_d >= 0.8\n| extend\n    EmailId          = EmailId_s,\n    TenantId         = TenantId_s,\n    ActionId         = ActionId_d,\n    ActionName       = ActionName_s,\n    Confidence       = Confidence_d,\n    RiskScore        = RiskScore_d,\n    SubCategory      = SubCategory_s,\n    Reasoning        = Reasoning_s,\n    SourceMailbox    = SourceMailbox_s,\n    SenderAddress    = SenderAddress_s,\n    SenderDomain     = SenderDomain_s,\n    Subject          = Subject_s,\n    RecipientAddress = RecipientAddress_s,\n    ModelVersion     = ModelVersion_s\n| project\n    TimeGenerated, EmailId, TenantId, ActionId, ActionName, Confidence, RiskScore,\n    SubCategory, Reasoning, SourceMailbox, SenderAddress, SenderDomain, Subject,\n    RecipientAddress, ModelVersion\n| order by TimeGenerated desc\n",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1566.001",
          "T1566.002"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "CredentialAccess",
          "Exfiltration",
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}