Microsoft Sentinel Analytic Rules
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Mimecast Secure Email Gateway - Spam Event Thread

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Iddf1b9377-5c29-4928-872f-9934a6b4f611
RulenameMimecast Secure Email Gateway - Spam Event Thread
DescriptionDetects threat from spam event thread protection logs
SeverityLow
TacticsDiscovery
TechniquesT1083
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_Spam_Event.yaml
Version1.0.0
Arm templatedf1b9377-5c29-4928-872f-9934a6b4f611.json
Deploy To Azure
MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"
name: Mimecast Secure Email Gateway - Spam Event Thread
triggerOperator: gt
suppressionEnabled: false
queryPeriod: 15m
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
  dataTypes:
  - MimecastSIEM_CL
severity: Low
queryFrequency: 5m
customDetails:
  SourceIP: SourceIP
  MsgId: MsgId_s
  SenderDomain: SenderDomain_s
  headerFrom: headerFrom_s
  Route: Route_s
enabled: true
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: Recipient
    columnName: Recipient_s
  - identifier: Subject
    columnName: Subject_s
  entityType: MailMessage
eventGroupingSettings:
  aggregationKind: SingleAlert
relevantTechniques:
- T1083
kind: Scheduled
description: Detects threat from spam event thread protection logs
tactics:
- Discovery
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Spam_Event.yaml
id: df1b9377-5c29-4928-872f-9934a6b4f611
suppressionDuration: 5h
incidentConfiguration:
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
    lookbackDuration: 1d
  createIncident: true
version: 1.0.0
{
  "$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"
    }
  ]
}