Mimecast Secure Email Gateway - Internal Email Protect

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Id	5b66d176-e344-4abf-b915-e5f09a6430ef
Rulename	Mimecast Secure Email Gateway - Internal Email Protect
Description	Detects threats from internal email threat protection
Severity	High
Tactics	LateralMovement Persistence Exfiltration
Techniques	T1534 T1546
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_Internal_Mail_Protect.yaml
Version	1.0.0
Arm template	5b66d176-e344-4abf-b915-e5f09a6430ef.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_iep"

YAML

triggerThreshold: 0
version: 1.0.0
triggerOperator: gt
description: Detects threats from internal email threat protection
tactics:
- LateralMovement
- Persistence
- Exfiltration
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: Sender_s
    identifier: Sender
  - columnName: Recipient_s
    identifier: Recipient
  - columnName: MsgId_s
    identifier: InternetMessageId
- entityType: URL
  fieldMappings:
  - columnName: URL_s
    identifier: Url
suppressionDuration: 5h
enabled: true
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_iep"
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: 1d
    matchingMethod: AllEntities
    enabled: true
queryFrequency: 5m
customDetails:
  Route: Route_s
  ScanResultInfo: ScanResultInfo_s
  UrlCategory: UrlCategory_s
  Subject: Subject_s
severity: High
name: Mimecast Secure Email Gateway - Internal Email Protect
queryPeriod: 15m
relevantTechniques:
- T1534
- T1546
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Internal_Mail_Protect.yaml
suppressionEnabled: false
id: 5b66d176-e344-4abf-b915-e5f09a6430ef
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert

ARM