Mimecast Secure Email Gateway - Impersonation Protect

MimecastCG
| where Type == "email_ttp_impersonation"
| extend  SenderEnvelope = ['Sender Envelope'] , SenderIp = ['Sender IP']

query: |
  MimecastCG
  | where Type == "email_ttp_impersonation"
  | extend  SenderEnvelope = ['Sender Envelope'] , SenderIp = ['Sender IP']  
id: 2ef77cef-439f-4d94-848f-3eca67510d2f
name: Mimecast Secure Email Gateway - Impersonation Protect
severity: High
triggerThreshold: 0
suppressionDuration: 5h
description: |
    'Detects threats from impersonation mail under targeted threat protection.'
status: Available
relevantTechniques:
- T1114
triggerOperator: gt
tactics:
- Discovery
- LateralMovement
- Collection
entityMappings:
- fieldMappings:
  - columnName: SenderEnvelope
    identifier: Sender
  - columnName: SenderIp
    identifier: SenderIP
  - columnName: Recipients
    identifier: Recipient
  entityType: MailMessage
requiredDataConnectors:
- connectorId: MimecastSEGAPI
  dataTypes:
  - MimecastCG
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: P7D
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
  createIncident: true
enabled: true
eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Impersonation.yaml
suppressionEnabled: false
queryPeriod: 15m
queryFrequency: 15m
version: 1.0.0
kind: Scheduled

{
  "$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/2ef77cef-439f-4d94-848f-3eca67510d2f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2ef77cef-439f-4d94-848f-3eca67510d2f')]",
      "properties": {
        "alertRuleTemplateName": "2ef77cef-439f-4d94-848f-3eca67510d2f",
        "customDetails": null,
        "description": "'Detects threats from impersonation mail under targeted threat protection.'\n",
        "displayName": "Mimecast Secure Email Gateway - Impersonation Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "SenderEnvelope",
                "identifier": "Sender"
              },
              {
                "columnName": "SenderIp",
                "identifier": "SenderIP"
              },
              {
                "columnName": "Recipients",
                "identifier": "Recipient"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P7D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Impersonation.yaml",
        "query": "MimecastCG\n| where Type == \"email_ttp_impersonation\"\n| extend  SenderEnvelope = ['Sender Envelope'] , SenderIp = ['Sender IP']\n",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Discovery",
          "LateralMovement"
        ],
        "techniques": [
          "T1114"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}