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	1.0.1
Arm template	df1b9377-5c29-4928-872f-9934a6b4f611.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"

YAML

kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
suppressionDuration: 5h
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: Sender_s
    identifier: Sender
  - columnName: Recipient_s
    identifier: Recipient
  - columnName: Subject_s
    identifier: Subject
description: Detects threat from spam event thread protection logs
severity: Low
queryFrequency: 5m
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    matchingMethod: AllEntities
    lookbackDuration: 1d
    enabled: true
  createIncident: true
triggerThreshold: 0
relevantTechniques:
- T1083
suppressionEnabled: false
customDetails:
  MsgId_s: MsgId_s
  headerFrom: headerFrom_s
  SourceIP: SourceIP
  Route: Route_s
  SenderDomain: SenderDomain_s
tactics:
- Discovery
name: Mimecast Secure Email Gateway - Spam Event Thread
id: df1b9377-5c29-4928-872f-9934a6b4f611
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
version: 1.0.1
enabled: true
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Spam_Event.yaml
queryPeriod: 15m

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_s": "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": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}