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

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

ARM