Microsoft Sentinel Analytic Rules
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Mimecast Targeted Threat Protection - Impersonation Protect

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Idd8e7eca6-4b59-4069-a31e-a022b2a12ea4
RulenameMimecast Targeted Threat Protection - Impersonation Protect
DescriptionDetects a maliciously tagged impersonation
SeverityHigh
TacticsExfiltration
Collection
Discovery
TechniquesT1114
Required data connectorsMimecastTTPAPI
KindScheduled
Query frequency5m
Query period15m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPImpersonation.yaml
Version1.0.0
Arm templated8e7eca6-4b59-4069-a31e-a022b2a12ea4.json
Deploy To Azure
MimecastTTPImpersonation_CL| where taggedMalicious_b == true;
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    lookbackDuration: 1d
    matchingMethod: AllEntities
    reopenClosedIncident: false
alertRuleTemplateName: 
eventGroupingSettings:
  aggregationKind: AlertPerResult
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1114
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPImpersonation.yaml
requiredDataConnectors:
- dataTypes:
  - MimecastTTPImpersonation_CL
  connectorId: MimecastTTPAPI
queryPeriod: 15m
tactics:
- Exfiltration
- Collection
- Discovery
severity: High
suppressionDuration: 5h
triggerOperator: gt
description: Detects a maliciously tagged impersonation
query: MimecastTTPImpersonation_CL| where taggedMalicious_b == true;
name: Mimecast Targeted Threat Protection - Impersonation Protect
version: 1.0.0
enabled: true
id: d8e7eca6-4b59-4069-a31e-a022b2a12ea4
suppressionEnabled: false
queryFrequency: 5m
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: senderAddress_s
    identifier: Sender
  - columnName: senderIpAddress_s
    identifier: SenderIP
  - columnName: recipientAddress_s
    identifier: Recipient
{
  "$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/d8e7eca6-4b59-4069-a31e-a022b2a12ea4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d8e7eca6-4b59-4069-a31e-a022b2a12ea4')]",
      "properties": {
        "alertRuleTemplateName": null,
        "customDetails": null,
        "description": "Detects a maliciously tagged impersonation",
        "displayName": "Mimecast Targeted Threat Protection - Impersonation Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "senderAddress_s",
                "identifier": "Sender"
              },
              {
                "columnName": "senderIpAddress_s",
                "identifier": "SenderIP"
              },
              {
                "columnName": "recipientAddress_s",
                "identifier": "Recipient"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P1D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastTTP/Analytic Rules/MimecastTTPImpersonation.yaml",
        "query": "MimecastTTPImpersonation_CL| where taggedMalicious_b == true;",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Discovery",
          "Exfiltration"
        ],
        "techniques": [
          "T1114"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}