Microsoft Sentinel Analytic Rules
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Mimecast Data Leak Prevention - Notifications

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Id1818aeaa-4cc8-426b-ba54-539de896d299
RulenameMimecast Data Leak Prevention - Notifications
DescriptionDetects threat for data leak when action is notification
SeverityHigh
TacticsExfiltration
TechniquesT1030
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/MimecastDLP.yaml
Version1.0.0
Arm template1818aeaa-4cc8-426b-ba54-539de896d299.json
Deploy To Azure
MimecastDLP_CL| where action_s == "notification";
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastDLP.yaml
eventGroupingSettings:
  aggregationKind: SingleAlert
kind: Scheduled
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: senderAddress_s
  - identifier: Recipient
    columnName: recipientAddress_s
  - identifier: DeliveryAction
    columnName: action_s
  entityType: MailMessage
query: MimecastDLP_CL| where action_s == "notification";
version: 1.0.0
triggerOperator: gt
tactics:
- Exfiltration
queryPeriod: 15m
name: Mimecast Data Leak Prevention - Notifications
severity: High
relevantTechniques:
- T1030
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: 1d
    enabled: true
requiredDataConnectors:
- dataTypes:
  - MimecastDLP_CL
  connectorId: MimecastSIEMAPI
triggerThreshold: 0
suppressionEnabled: false
queryFrequency: 5m
enabled: true
alertRuleTemplateName: 
suppressionDuration: 5h
id: 1818aeaa-4cc8-426b-ba54-539de896d299
description: Detects threat for data leak when action is notification
{
  "$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/1818aeaa-4cc8-426b-ba54-539de896d299')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/1818aeaa-4cc8-426b-ba54-539de896d299')]",
      "properties": {
        "alertRuleTemplateName": null,
        "customDetails": null,
        "description": "Detects threat for data leak when action is notification",
        "displayName": "Mimecast Data Leak Prevention - Notifications",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "senderAddress_s",
                "identifier": "Sender"
              },
              {
                "columnName": "recipientAddress_s",
                "identifier": "Recipient"
              },
              {
                "columnName": "action_s",
                "identifier": "DeliveryAction"
              }
            ]
          }
        ],
        "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/MimecastDLP.yaml",
        "query": "MimecastDLP_CL| where action_s == \"notification\";",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1030"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}