Mimecast Secure Email Gateway - URL Protect

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Id	ea19dae6-bbb3-4444-a1b8-8e9ae6064aab
Rulename	Mimecast Secure Email Gateway - URL Protect
Description	Detect threat when potentially malicious url found
Severity	High
Tactics	InitialAccess Discovery Execution
Techniques	T1566
Required data connectors	MimecastSIEMAPI
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/MimecastSEG/Analytic Rules/MimecastSIEM_Url_Protect.yaml
Version	1.0.0
Arm template	ea19dae6-bbb3-4444-a1b8-8e9ae6064aab.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"

YAML

relevantTechniques:
- T1566
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1d
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
name: Mimecast Secure Email Gateway - URL Protect
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: sender_s
  - identifier: Recipient
    columnName: recipient_s
  - identifier: Subject
    columnName: subject_s
  entityType: MailMessage
triggerThreshold: 0
id: ea19dae6-bbb3-4444-a1b8-8e9ae6064aab
tactics:
- InitialAccess
- Discovery
- Execution
version: 1.0.0
customDetails:
  action: action_s
  senderDomain: senderDomain_s
  SourceIP: SourceIP
  reason: reason_s
  urlCategory: urlCategory_s
  route: route_s
  url: url_s
  credentialTheft: credentialTheft_s
  msgid: msgid_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Url_Protect.yaml
queryPeriod: 15m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
enabled: true
suppressionDuration: 5h
queryFrequency: 5m
severity: High
suppressionEnabled: false
description: Detect threat when potentially malicious url found
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"
triggerOperator: gt

ARM

{
  "$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/ea19dae6-bbb3-4444-a1b8-8e9ae6064aab')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ea19dae6-bbb3-4444-a1b8-8e9ae6064aab')]",
      "properties": {
        "alertRuleTemplateName": "ea19dae6-bbb3-4444-a1b8-8e9ae6064aab",
        "customDetails": {
          "action": "action_s",
          "credentialTheft": "credentialTheft_s",
          "msgid": "msgid_s",
          "reason": "reason_s",
          "route": "route_s",
          "senderDomain": "senderDomain_s",
          "SourceIP": "SourceIP",
          "url": "url_s",
          "urlCategory": "urlCategory_s"
        },
        "description": "Detect threat when potentially malicious url found",
        "displayName": "Mimecast Secure Email Gateway - URL Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "sender_s",
                "identifier": "Sender"
              },
              {
                "columnName": "recipient_s",
                "identifier": "Recipient"
              },
              {
                "columnName": "subject_s",
                "identifier": "Subject"
              }
            ]
          }
        ],
        "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_Url_Protect.yaml",
        "query": "MimecastSIEM_CL| where mimecastEventId_s==\"mail_ttp_url\" and reason_s != \"clean\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery",
          "Execution",
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}