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

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

ARM