Mimecast Targeted Threat Protection - Attachment Protect

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Id	aa75944c-a663-4901-969e-7b55bfa49a73
Rulename	Mimecast Targeted Threat Protection - Attachment Protect
Description	Detects a threat for an unsafe attachment in an email
Severity	High
Tactics	InitialAccess Discovery
Techniques	T0865
Required data connectors	MimecastTTPAPI
Kind	Scheduled
Query frequency	5m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPAttachment.yaml
Version	1.0.0
Arm template	aa75944c-a663-4901-969e-7b55bfa49a73.json

KQL

MimecastTTPAttachment_CL| where result_s <> "safe";

YAML

id: aa75944c-a663-4901-969e-7b55bfa49a73
triggerThreshold: 0
eventGroupingSettings:
  aggregationKind: AlertPerResult
suppressionEnabled: false
severity: High
customDetails:
  fileName: fileName_s
  fileType: fileType_s
  details: details_s
  fileHash: fileHash_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPAttachment.yaml
relevantTechniques:
- T0865
requiredDataConnectors:
- connectorId: MimecastTTPAPI
  dataTypes:
  - MimecastTTPAttachment_CL
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: senderAddress_s
  - identifier: Recipient
    columnName: recipientAddress_s
  - identifier: Subject
    columnName: subject_s
  entityType: MailMessage
version: 1.0.0
query: MimecastTTPAttachment_CL| where result_s <> "safe";
queryPeriod: 15m
alertRuleTemplateName: 
triggerOperator: gt
tactics:
- InitialAccess
- Discovery
enabled: true
suppressionDuration: 5h
incidentConfiguration:
  groupingConfiguration:
    enabled: true
    matchingMethod: AllEntities
    lookbackDuration: 1d
    reopenClosedIncident: false
  createIncident: true
description: Detects a threat for an unsafe attachment in an email
name: Mimecast Targeted Threat Protection - Attachment Protect
kind: Scheduled
queryFrequency: 5m

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/aa75944c-a663-4901-969e-7b55bfa49a73')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aa75944c-a663-4901-969e-7b55bfa49a73')]",
      "properties": {
        "alertRuleTemplateName": "aa75944c-a663-4901-969e-7b55bfa49a73",
        "customDetails": {
          "details": "details_s",
          "fileHash": "fileHash_s",
          "fileName": "fileName_s",
          "fileType": "fileType_s"
        },
        "description": "Detects a threat for an unsafe attachment in an email",
        "displayName": "Mimecast Targeted Threat Protection - Attachment Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "senderAddress_s",
                "identifier": "Sender"
              },
              {
                "columnName": "recipientAddress_s",
                "identifier": "Recipient"
              },
              {
                "columnName": "subject_s",
                "identifier": "Subject"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P1D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPAttachment.yaml",
        "query": "MimecastTTPAttachment_CL| where result_s <> \"safe\";",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery",
          "InitialAccess"
        ],
        "techniques": null,
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}