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

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

ARM