Mimecast Secure Email Gateway - Internal Email Protect

MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_iep"

relevantTechniques:
- T1534
- T1546
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1d
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
name: Mimecast Secure Email Gateway - Internal Email Protect
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: Recipient
    columnName: Recipient_s
  - identifier: InternetMessageId
    columnName: MsgId_s
  entityType: MailMessage
- fieldMappings:
  - identifier: Url
    columnName: URL_s
  entityType: URL
triggerThreshold: 0
id: 5b66d176-e344-4abf-b915-e5f09a6430ef
tactics:
- LateralMovement
- Persistence
- Exfiltration
version: 1.0.0
customDetails:
  Subject: Subject_s
  Route: Route_s
  UrlCategory: UrlCategory_s
  ScanResultInfo: ScanResultInfo_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Internal_Mail_Protect.yaml
queryPeriod: 15m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
enabled: true
suppressionDuration: 5h
queryFrequency: 5m
severity: High
suppressionEnabled: false
description: Detects threats from internal email threat protection
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_iep"
triggerOperator: gt

{
  "$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/5b66d176-e344-4abf-b915-e5f09a6430ef')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/5b66d176-e344-4abf-b915-e5f09a6430ef')]",
      "properties": {
        "alertRuleTemplateName": "5b66d176-e344-4abf-b915-e5f09a6430ef",
        "customDetails": {
          "Route": "Route_s",
          "ScanResultInfo": "ScanResultInfo_s",
          "Subject": "Subject_s",
          "UrlCategory": "UrlCategory_s"
        },
        "description": "Detects threats from internal email threat protection",
        "displayName": "Mimecast Secure Email Gateway - Internal Email Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "Sender_s",
                "identifier": "Sender"
              },
              {
                "columnName": "Recipient_s",
                "identifier": "Recipient"
              },
              {
                "columnName": "MsgId_s",
                "identifier": "InternetMessageId"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "URL_s",
                "identifier": "Url"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P1D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Internal_Mail_Protect.yaml",
        "query": "MimecastSIEM_CL| where mimecastEventId_s==\"mail_ttp_iep\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration",
          "LateralMovement",
          "Persistence"
        ],
        "techniques": [
          "T1534",
          "T1546"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}