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

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

ARM