ProofpointPOD - Possible data exfiltration to private email

Back


Id	aedc5b33-2d7c-42cb-a692-f25ef637cbb1
Rulename	ProofpointPOD - Possible data exfiltration to private email
Description	Detects when sender sent email to the non-corporate domain and recipient’s username is the same as sender’s username.
Severity	Medium
Tactics	InitialAccess
Techniques	T1078
Required data connectors	ProofpointPOD
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODDataExfiltrationToPrivateEmail.yaml
Version	1.0.1
Arm template	aedc5b33-2d7c-42cb-a692-f25ef637cbb1.json

KQL

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

YAML

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

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/aedc5b33-2d7c-42cb-a692-f25ef637cbb1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aedc5b33-2d7c-42cb-a692-f25ef637cbb1')]",
      "properties": {
        "alertRuleTemplateName": "aedc5b33-2d7c-42cb-a692-f25ef637cbb1",
        "customDetails": null,
        "description": "'Detects when sender sent email to the non-corporate domain and recipient's username is the same as sender's username.'\n",
        "displayName": "ProofpointPOD - Possible data exfiltration to private email",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODDataExfiltrationToPrivateEmail.yaml",
        "query": "let lbtime = 10m;\nProofpointPOD\n| where TimeGenerated > ago(lbtime)\n| where EventType == 'message'\n| where NetworkDirection == 'outbound'\n| where array_length(todynamic(DstUserUpn)) == 1\n| extend sender = extract(@'\\A(.*?)@', 1, SrcUserUpn)\n| extend sender_domain = extract(@'@(.*)$', 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"
    }
  ]
}