Microsoft Sentinel Analytic Rules
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ProofpointPOD - Possible data exfiltration to private email

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Idaedc5b33-2d7c-42cb-a692-f25ef637cbb1
RulenameProofpointPOD - Possible data exfiltration to private email
DescriptionDetects when sender sent email to the non-corporate domain and recipient’s username is the same as sender’s username.
SeverityMedium
TacticsInitialAccess
TechniquesT1078
Required data connectorsProofpointPOD
KindScheduled
Query frequency10m
Query period10m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODDataExfiltrationToPrivateEmail.yaml
Version1.0.1
Arm templateaedc5b33-2d7c-42cb-a692-f25ef637cbb1.json
Deploy To Azure
let lbtime = 10m;
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'outbound'
| where array_length(todynamic(DstUserUpn)) == 1
| extend sender = extract(@'\A(.*?)@', 1, SrcUserUpn)
| extend sender_domain = extract(@'@(.*)$', 1, SrcUserUpn)
| extend recipient = extract(@'\A(.*?)@', 1, tostring(todynamic(DstUserUpn)[0]))
| extend recipient_domain = extract(@'@(.*)$', 1, tostring(todynamic(DstUserUpn)[0]))
| where sender =~ recipient
| where sender_domain != recipient_domain
| project SrcUserUpn, DstUserUpn
| extend AccountCustomEntity = SrcUserUpn
kind: Scheduled
relevantTechniques:
- T1078
description: |
    'Detects when sender sent email to the non-corporate domain and recipient's username is the same as sender's username.'
queryPeriod: 10m
queryFrequency: 10m
tactics:
- InitialAccess
name: ProofpointPOD - Possible data exfiltration to private email
requiredDataConnectors:
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_message_CL
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
triggerThreshold: 0
version: 1.0.1
id: aedc5b33-2d7c-42cb-a692-f25ef637cbb1
query: |
  let lbtime = 10m;
  ProofpointPOD
  | where TimeGenerated > ago(lbtime)
  | where EventType == 'message'
  | where NetworkDirection == 'outbound'
  | where array_length(todynamic(DstUserUpn)) == 1
  | extend sender = extract(@'\A(.*?)@', 1, SrcUserUpn)
  | extend sender_domain = extract(@'@(.*)$', 1, SrcUserUpn)
  | extend recipient = extract(@'\A(.*?)@', 1, tostring(todynamic(DstUserUpn)[0]))
  | extend recipient_domain = extract(@'@(.*)$', 1, tostring(todynamic(DstUserUpn)[0]))
  | where sender =~ recipient
  | where sender_domain != recipient_domain
  | project SrcUserUpn, DstUserUpn
  | extend AccountCustomEntity = SrcUserUpn  
status: Available
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODDataExfiltrationToPrivateEmail.yaml
severity: Medium
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/aedc5b33-2d7c-42cb-a692-f25ef637cbb1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aedc5b33-2d7c-42cb-a692-f25ef637cbb1')]",
      "properties": {
        "alertRuleTemplateName": "aedc5b33-2d7c-42cb-a692-f25ef637cbb1",
        "customDetails": null,
        "description": "'Detects when sender sent email to the non-corporate domain and recipient's username is the same as sender's username.'\n",
        "displayName": "ProofpointPOD - Possible data exfiltration to private email",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODDataExfiltrationToPrivateEmail.yaml",
        "query": "let lbtime = 10m;\nProofpointPOD\n| where TimeGenerated > ago(lbtime)\n| where EventType == 'message'\n| where NetworkDirection == 'outbound'\n| where array_length(todynamic(DstUserUpn)) == 1\n| extend sender = extract(@'\\A(.*?)@', 1, SrcUserUpn)\n| extend sender_domain = extract(@'@(.*)$', 1, SrcUserUpn)\n| extend recipient = extract(@'\\A(.*?)@', 1, tostring(todynamic(DstUserUpn)[0]))\n| extend recipient_domain = extract(@'@(.*)$', 1, tostring(todynamic(DstUserUpn)[0]))\n| where sender =~ recipient\n| where sender_domain != recipient_domain\n| project SrcUserUpn, DstUserUpn\n| extend AccountCustomEntity = SrcUserUpn\n",
        "queryFrequency": "PT10M",
        "queryPeriod": "PT10M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}