ProofpointPOD - Email sender in TI list

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| where Active == true
| where isnotempty(EmailSenderAddress)
| extend TI_emailEntity = EmailSenderAddress
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
       ProofpointPOD
       | where TimeGenerated >= ago(dt_lookBack)
       | where isnotempty(SrcUserUpn)
       | extend ProofpointPOD_TimeGenerated = TimeGenerated, ClientEmail = SrcUserUpn
)
on $left.TI_emailEntity == $right.ClientEmail
| where ProofpointPOD_TimeGenerated < ExpirationDateTime
| summarize ProofpointPOD_TimeGenerated = arg_max(ProofpointPOD_TimeGenerated, *) by IndicatorId, ClientEmail
| project ProofpointPOD_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, ClientEmail
| extend timestamp = ProofpointPOD_TimeGenerated

name: ProofpointPOD - Email sender in TI list
tactics:
- Exfiltration
- InitialAccess
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_maillog_CL
triggerOperator: gt
id: 35a0792a-1269-431e-ac93-7ae2980d4dde
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODEmailSenderInTIList.yaml
description: |
  'Email sender in TI list.'
kind: Scheduled
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: ClientEmail
    identifier: FullName
queryFrequency: 1d
relevantTechniques:
- T1078
- T1567
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
  | where Active == true
  | where isnotempty(EmailSenderAddress)
  | extend TI_emailEntity = EmailSenderAddress
  // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  | join kind=innerunique (
         ProofpointPOD
         | where TimeGenerated >= ago(dt_lookBack)
         | where isnotempty(SrcUserUpn)
         | extend ProofpointPOD_TimeGenerated = TimeGenerated, ClientEmail = SrcUserUpn
  )
  on $left.TI_emailEntity == $right.ClientEmail
  | where ProofpointPOD_TimeGenerated < ExpirationDateTime
  | summarize ProofpointPOD_TimeGenerated = arg_max(ProofpointPOD_TimeGenerated, *) by IndicatorId, ClientEmail
  | project ProofpointPOD_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, ClientEmail
  | extend timestamp = ProofpointPOD_TimeGenerated
triggerThreshold: 0
queryPeriod: 14d
version: 1.1.2
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/35a0792a-1269-431e-ac93-7ae2980d4dde')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/35a0792a-1269-431e-ac93-7ae2980d4dde')]",
      "properties": {
        "alertRuleTemplateName": "35a0792a-1269-431e-ac93-7ae2980d4dde",
        "customDetails": null,
        "description": "'Email sender in TI list.'\n",
        "displayName": "ProofpointPOD - Email sender in TI list",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ClientEmail",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODEmailSenderInTIList.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| where Active == true\n| where isnotempty(EmailSenderAddress)\n| extend TI_emailEntity = EmailSenderAddress\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n       ProofpointPOD\n       | where TimeGenerated >= ago(dt_lookBack)\n       | where isnotempty(SrcUserUpn)\n       | extend ProofpointPOD_TimeGenerated = TimeGenerated, ClientEmail = SrcUserUpn\n)\non $left.TI_emailEntity == $right.ClientEmail\n| where ProofpointPOD_TimeGenerated < ExpirationDateTime\n| summarize ProofpointPOD_TimeGenerated = arg_max(ProofpointPOD_TimeGenerated, *) by IndicatorId, ClientEmail\n| project ProofpointPOD_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, ClientEmail\n| extend timestamp = ProofpointPOD_TimeGenerated\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration",
          "InitialAccess"
        ],
        "techniques": [
          "T1078",
          "T1567"
        ],
        "templateVersion": "1.1.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}