Microsoft Sentinel Analytic Rules
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Mimecast Secure Email Gateway - URL Protect

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Idea19dae6-bbb3-4444-a1b8-8e9ae6064aab
RulenameMimecast Secure Email Gateway - URL Protect
DescriptionDetect threat when potentially malicious url found
SeverityHigh
TacticsInitialAccess
Discovery
Execution
TechniquesT1566
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_Url_Protect.yaml
Version1.0.0
Arm templateea19dae6-bbb3-4444-a1b8-8e9ae6064aab.json
Deploy To Azure
MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    lookbackDuration: 1d
    matchingMethod: AllEntities
    reopenClosedIncident: false
eventGroupingSettings:
  aggregationKind: SingleAlert
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1566
customDetails:
  action: action_s
  credentialTheft: credentialTheft_s
  senderDomain: senderDomain_s
  reason: reason_s
  msgid: msgid_s
  route: route_s
  urlCategory: urlCategory_s
  SourceIP: SourceIP
  url: url_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Url_Protect.yaml
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
queryPeriod: 15m
tactics:
- InitialAccess
- Discovery
- Execution
severity: High
suppressionDuration: 5h
triggerOperator: gt
description: Detect threat when potentially malicious url found
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"
name: Mimecast Secure Email Gateway - URL Protect
version: 1.0.0
enabled: true
id: ea19dae6-bbb3-4444-a1b8-8e9ae6064aab
suppressionEnabled: false
queryFrequency: 5m
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: sender_s
    identifier: Sender
  - columnName: recipient_s
    identifier: Recipient
  - columnName: subject_s
    identifier: Subject
{
  "$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/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",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery",
          "Execution",
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}