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

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

ARM