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

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

ARM