ProofpointPOD - Multiple large emails to the same recipient

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Id	d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
Rulename	ProofpointPOD - Multiple large emails to the same recipient
Description	Detects when multiple emails with large size where sent to the same recipient.
Severity	Medium
Tactics	Exfiltration
Techniques	T1567
Required data connectors	ProofpointPOD
Kind	Scheduled
Query frequency	30m
Query period	30m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
Version	1.0.1
Arm template	d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32.json

KQL

let lbtime = 30m;
let msgthreshold = 3;
let msgszthreshold = 3000000;
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'outbound'
| where NetworkBytes > msgszthreshold
| summarize count() by SrcUserUpn, DstUserUpn
| where count_ > msgthreshold
| extend AccountCustomEntity = SrcUserUpn

YAML

name: ProofpointPOD - Multiple large emails to the same recipient
triggerOperator: gt
query: |
  let lbtime = 30m;
  let msgthreshold = 3;
  let msgszthreshold = 3000000;
  ProofpointPOD
  | where TimeGenerated > ago(lbtime)
  | where EventType == 'message'
  | where NetworkDirection == 'outbound'
  | where NetworkBytes > msgszthreshold
  | summarize count() by SrcUserUpn, DstUserUpn
  | where count_ > msgthreshold
  | extend AccountCustomEntity = SrcUserUpn
queryFrequency: 30m
description: |
  'Detects when multiple emails with large size where sent to the same recipient.'
id: d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
triggerThreshold: 0
queryPeriod: 30m
version: 1.0.1
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_message_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
relevantTechniques:
- T1567
tactics:
- Exfiltration
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account

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/d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32')]",
      "properties": {
        "alertRuleTemplateName": "d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32",
        "customDetails": null,
        "description": "'Detects when multiple emails with large size where sent to the same recipient.'\n",
        "displayName": "ProofpointPOD - Multiple large emails to the same recipient",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml",
        "query": "let lbtime = 30m;\nlet msgthreshold = 3;\nlet msgszthreshold = 3000000;\nProofpointPOD\n| where TimeGenerated > ago(lbtime)\n| where EventType == 'message'\n| where NetworkDirection == 'outbound'\n| where NetworkBytes > msgszthreshold\n| summarize count() by SrcUserUpn, DstUserUpn\n| where count_ > msgthreshold\n| extend AccountCustomEntity = SrcUserUpn\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1567"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}