Microsoft Sentinel Analytic Rules
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ProofpointPOD - Multiple large emails to the same recipient

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Idd1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
RulenameProofpointPOD - Multiple large emails to the same recipient
DescriptionDetects when multiple emails with large size where sent to the same recipient.
SeverityMedium
TacticsExfiltration
TechniquesT1567
Required data connectorsProofpointPOD
KindScheduled
Query frequency30m
Query period30m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
Version1.0.1
Arm templated1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32.json
Deploy To Azure
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
kind: Scheduled
status: Available
triggerThreshold: 0
relevantTechniques:
- T1567
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
requiredDataConnectors:
- dataTypes:
  - ProofpointPOD_message_CL
  connectorId: ProofpointPOD
queryPeriod: 30m
tactics:
- Exfiltration
severity: Medium
triggerOperator: gt
description: |
    'Detects when multiple emails with large size where sent to the same recipient.'
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  
name: ProofpointPOD - Multiple large emails to the same recipient
version: 1.0.1
id: d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
queryFrequency: 30m
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-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 On demand(POD) Email Security/Analytic Rules/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",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1567"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}