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Mimecast Secure Email Gateway - Impersonation Protect

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Id7034abc9-6b66-4533-9bf3-056672fd9d9e
RulenameMimecast Secure Email Gateway - Impersonation Protect
DescriptionDetects threats from impersonation mail under targeted threat protection
SeverityHigh
TacticsDiscovery
LateralMovement
Collection
TechniquesT1114
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_Impersonation.yaml
Version1.0.0
Arm template7034abc9-6b66-4533-9bf3-056672fd9d9e.json
Deploy To Azure
MimecastSIEM_CL| where mimecastEventId_s == "mail_ttp_impersonation"
triggerThreshold: 0
severity: High
id: 7034abc9-6b66-4533-9bf3-056672fd9d9e
suppressionEnabled: false
relevantTechniques:
- T1114
enabled: true
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: SenderIP
    columnName: IP_s
  - identifier: Recipient
    columnName: Recipient_s
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
  dataTypes:
  - MimecastSIEM_CL
version: 1.0.0
queryFrequency: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Impersonation.yaml
eventGroupingSettings:
  aggregationKind: SingleAlert
tactics:
- Discovery
- LateralMovement
- Collection
triggerOperator: gt
description: Detects threats from impersonation mail under targeted threat protection
name: Mimecast Secure Email Gateway - Impersonation Protect
customDetails:
  SimilarMCExtDomain: SimilarMimecastExternalDomain_s
  NewDomain: NewDomain_s
  Action: Action_s
  TaggedExternal: TaggedExternal_s
  InternalName: InternalName_s
  SimilarCustExtDomain: SimilarCustomExternalDomain_s
  Route: Route_s
  ReplyMismatch: ReplyMismatch_s
  CustomName: CustomName_s
  MsgId: MsgId_s
  Definition: Definition_s
  CustomThreatDict: CustomThreatDictionary_s
  TaggedMalicious: TaggedMalicious_s
  Hits: Hits_s
  Subject: Subject_s
  ThreatDictionary: ThreatDictionary_s
  SimilarIntDomain: SimilarInternalDomain_s
queryPeriod: 15m
suppressionDuration: 5h
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: AllEntities
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1d
kind: Scheduled
query: MimecastSIEM_CL| where mimecastEventId_s == "mail_ttp_impersonation"
{
  "$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/7034abc9-6b66-4533-9bf3-056672fd9d9e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7034abc9-6b66-4533-9bf3-056672fd9d9e')]",
      "properties": {
        "alertRuleTemplateName": "7034abc9-6b66-4533-9bf3-056672fd9d9e",
        "customDetails": {
          "Action": "Action_s",
          "CustomName": "CustomName_s",
          "CustomThreatDict": "CustomThreatDictionary_s",
          "Definition": "Definition_s",
          "Hits": "Hits_s",
          "InternalName": "InternalName_s",
          "MsgId": "MsgId_s",
          "NewDomain": "NewDomain_s",
          "ReplyMismatch": "ReplyMismatch_s",
          "Route": "Route_s",
          "SimilarCustExtDomain": "SimilarCustomExternalDomain_s",
          "SimilarIntDomain": "SimilarInternalDomain_s",
          "SimilarMCExtDomain": "SimilarMimecastExternalDomain_s",
          "Subject": "Subject_s",
          "TaggedExternal": "TaggedExternal_s",
          "TaggedMalicious": "TaggedMalicious_s",
          "ThreatDictionary": "ThreatDictionary_s"
        },
        "description": "Detects threats from impersonation mail under targeted threat protection",
        "displayName": "Mimecast Secure Email Gateway - Impersonation Protect",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "MailMessage",
            "fieldMappings": [
              {
                "columnName": "Sender_s",
                "identifier": "Sender"
              },
              {
                "columnName": "IP_s",
                "identifier": "SenderIP"
              },
              {
                "columnName": "Recipient_s",
                "identifier": "Recipient"
              }
            ]
          }
        ],
        "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_Impersonation.yaml",
        "query": "MimecastSIEM_CL| where mimecastEventId_s == \"mail_ttp_impersonation\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Discovery",
          "LateralMovement"
        ],
        "techniques": [
          "T1114"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}