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

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

ARM