Mimecast Secure Email Gateway - Attachment Protect

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Id	72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2
Rulename	Mimecast Secure Email Gateway - Attachment Protect
Description	Detect threat for mail attachment under the targeted threat protection.
Severity	High
Tactics	Collection Exfiltration Discovery InitialAccess Execution
Techniques	T1114 T1566 T0865
Required data connectors	MimecastSEGAPI
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Attachment.yaml
Version	1.0.0
Arm template	72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2.json

KQL

MimecastCG
| where Type == "email_ttp_ap"
| extend  SenderEnvelope = ['Sender Envelope']  , SenderIp = ['Sender IP']

YAML

incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: P7D
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true
id: 72bd7b0c-493c-4fa5-8a95-7f6376b6cfb2
query: |
  MimecastCG
  | where Type == "email_ttp_ap"
  | extend  SenderEnvelope = ['Sender Envelope']  , SenderIp = ['Sender IP']  
description: |
    'Detect threat for mail attachment under the targeted threat protection.'
requiredDataConnectors:
- connectorId: MimecastSEGAPI
  dataTypes:
  - MimecastCG
enabled: true
tactics:
- Collection
- Exfiltration
- Discovery
- InitialAccess
- Execution
status: Available
queryFrequency: 15m
queryPeriod: 15m
suppressionEnabled: false
triggerOperator: gt
kind: Scheduled
name: Mimecast Secure Email Gateway - Attachment Protect
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastSEG/MimecastCG_Attachment.yaml
version: 1.0.0
eventGroupingSettings:
  aggregationKind: AlertPerResult
relevantTechniques:
- T1114
- T1566
- T0865
suppressionDuration: 5h
severity: High
entityMappings:
- fieldMappings:
  - identifier: Sender
    columnName: SenderEnvelope
  - identifier: Recipient
    columnName: Recipients
  - identifier: Subject
    columnName: Subject
  entityType: MailMessage
- fieldMappings:
  - identifier: Address
    columnName: SenderIp
  entityType: IP
triggerThreshold: 0

ARM