Microsoft Sentinel Analytic Rules
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Mimecast Secure Email Gateway - Attachment Protect

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Id72264f4f-61fb-4f4f-96c4-635571a376c2
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 connectorsMimecastSIEMAPI
KindScheduled
Query frequency5m
Query period15m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Attachment.yaml
Version1.0.1
Arm template72264f4f-61fb-4f4f-96c4-635571a376c2.json
Deploy To Azure
MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_attachment"
customDetails:
  fileName: fileName_s
  sha256: sha256_s
  MsgId_s: MsgId_s
id: 72264f4f-61fb-4f4f-96c4-635571a376c2
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_attachment"
suppressionDuration: 5h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Attachment.yaml
description: Detect threat for mail attachment under the targeted threat protection
name: Mimecast Secure Email Gateway - Attachment Protect
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: 1d
    enabled: true
  createIncident: true
suppressionEnabled: false
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: Recipient
    columnName: Recipient_s
  - identifier: Subject
    columnName: Subject_s
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IP_s
triggerThreshold: 0
version: 1.0.1
enabled: true
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
eventGroupingSettings:
  aggregationKind: SingleAlert
queryFrequency: 5m
queryPeriod: 15m
severity: High
relevantTechniques:
- T1114
- T1566
- T0865
kind: Scheduled
tactics:
- Collection
- Exfiltration
- Discovery
- InitialAccess
- Execution
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/72264f4f-61fb-4f4f-96c4-635571a376c2')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/72264f4f-61fb-4f4f-96c4-635571a376c2')]",
      "properties": {
        "alertRuleTemplateName": "72264f4f-61fb-4f4f-96c4-635571a376c2",
        "customDetails": {
          "fileName": "fileName_s",
          "MsgId_s": "MsgId_s",
          "sha256": "sha256_s"
        },
        "description": "Detect threat for mail attachment under the targeted threat protection",
        "displayName": "Mimecast Secure Email Gateway - Attachment Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "Sender_s",
                "identifier": "Sender"
              },
              {
                "columnName": "Recipient_s",
                "identifier": "Recipient"
              },
              {
                "columnName": "Subject_s",
                "identifier": "Subject"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IP_s",
                "identifier": "Address"
              }
            ]
          }
        ],
        "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_Attachment.yaml",
        "query": "MimecastSIEM_CL| where mimecastEventId_s==\"mail_ttp_attachment\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Discovery",
          "Execution",
          "Exfiltration",
          "InitialAccess"
        ],
        "techniques": [
          "T1114",
          "T1566"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}