Microsoft Sentinel Analytic Rules
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Mimecast Secure Email Gateway - Attachment Protect

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Id72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2
RulenameMimecast Secure Email Gateway - Attachment Protect
DescriptionDetect threat for mail attachment under the targeted threat protection.
SeverityHigh
TacticsCollection
Exfiltration
Discovery
InitialAccess
Execution
TechniquesT1114
T1566
T0865
Required data connectorsMimecastSEGAPI
KindScheduled
Query frequency15m
Query period15m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Attachment.yaml
Version1.0.0
Arm template72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2.json
Deploy To Azure
MimecastCG
| where Type == "email_ttp_ap"
| extend  SenderEnvelope = ['Sender Envelope']  , SenderIp = ['Sender IP']
tactics:
- Collection
- Exfiltration
- Discovery
- InitialAccess
- Execution
entityMappings:
- fieldMappings:
  - columnName: SenderEnvelope
    identifier: Sender
  - columnName: Recipients
    identifier: Recipient
  - columnName: Subject
    identifier: Subject
  entityType: MailMessage
- fieldMappings:
  - columnName: SenderIp
    identifier: Address
  entityType: IP
queryPeriod: 15m
requiredDataConnectors:
- dataTypes:
  - MimecastCG
  connectorId: MimecastSEGAPI
version: 1.0.0
triggerThreshold: 0
status: Available
suppressionEnabled: false
kind: Scheduled
relevantTechniques:
- T1114
- T1566
- T0865
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Attachment.yaml
description: |
    'Detect threat for mail attachment under the targeted threat protection.'
query: |
  MimecastCG
  | where Type == "email_ttp_ap"
  | extend  SenderEnvelope = ['Sender Envelope']  , SenderIp = ['Sender IP']  
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    lookbackDuration: P7D
    matchingMethod: AllEntities
    reopenClosedIncident: false
suppressionDuration: 5h
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: 72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2
name: Mimecast Secure Email Gateway - Attachment Protect
queryFrequency: 15m
triggerOperator: gt
severity: High
enabled: true
{
  "$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/72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2')]",
      "properties": {
        "alertRuleTemplateName": "72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2",
        "customDetails": null,
        "description": "'Detect threat for mail attachment under the targeted threat protection.'\n",
        "displayName": "Mimecast Secure Email Gateway - Attachment Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "SenderEnvelope",
                "identifier": "Sender"
              },
              {
                "columnName": "Recipients",
                "identifier": "Recipient"
              },
              {
                "columnName": "Subject",
                "identifier": "Subject"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SenderIp",
                "identifier": "Address"
              }
            ]
          }
        ],
        "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_Attachment.yaml",
        "query": "MimecastCG\n| where Type == \"email_ttp_ap\"\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",
          "Execution",
          "Exfiltration",
          "InitialAccess"
        ],
        "techniques": [
          "T1114",
          "T1566"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}