Mimecast Secure Email Gateway - Spam Event Thread

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Id	df1b9377-5c29-4928-872f-9934a6b4f611
Rulename	Mimecast Secure Email Gateway - Spam Event Thread
Description	Detects threat from spam event thread protection logs
Severity	Low
Tactics	Discovery
Techniques	T1083
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_Spam_Event.yaml
Version	1.0.0
Arm template	df1b9377-5c29-4928-872f-9934a6b4f611.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"

YAML

relevantTechniques:
- T1083
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1d
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
name: Mimecast Secure Email Gateway - Spam Event Thread
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: df1b9377-5c29-4928-872f-9934a6b4f611
tactics:
- Discovery
version: 1.0.0
customDetails:
  SenderDomain: SenderDomain_s
  SourceIP: SourceIP
  headerFrom: headerFrom_s
  Route: Route_s
  MsgId: MsgId_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Spam_Event.yaml
queryPeriod: 15m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
enabled: true
suppressionDuration: 5h
queryFrequency: 5m
severity: Low
suppressionEnabled: false
description: Detects threat from spam event thread protection logs
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"
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/df1b9377-5c29-4928-872f-9934a6b4f611')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/df1b9377-5c29-4928-872f-9934a6b4f611')]",
      "properties": {
        "alertRuleTemplateName": "df1b9377-5c29-4928-872f-9934a6b4f611",
        "customDetails": {
          "headerFrom": "headerFrom_s",
          "MsgId": "MsgId_s",
          "Route": "Route_s",
          "SenderDomain": "SenderDomain_s",
          "SourceIP": "SourceIP"
        },
        "description": "Detects threat from spam event thread protection logs",
        "displayName": "Mimecast Secure Email Gateway - Spam Event Thread",
        "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_Spam_Event.yaml",
        "query": "MimecastSIEM_CL| where mimecastEventId_s==\"mail_spameventthread\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "Low",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery"
        ],
        "techniques": [
          "T1083"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}