Mimecast Secure Email Gateway - Attachment Protect

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Id	72264f4f-61fb-4f4f-96c4-635571a376c2
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	MimecastSIEMAPI
Kind	Scheduled
Query frequency	5m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Attachment.yaml
Version	1.0.1
Arm template	72264f4f-61fb-4f4f-96c4-635571a376c2.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_attachment"

YAML

queryPeriod: 15m
relevantTechniques:
- T1114
- T1566
- T0865
version: 1.0.1
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_attachment"
triggerThreshold: 0
tactics:
- Collection
- Exfiltration
- Discovery
- InitialAccess
- Execution
id: 72264f4f-61fb-4f4f-96c4-635571a376c2
triggerOperator: gt
enabled: true
suppressionEnabled: false
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Attachment.yaml
queryFrequency: 5m
incidentConfiguration:
  groupingConfiguration:
    enabled: true
    matchingMethod: AllEntities
    lookbackDuration: 1d
    reopenClosedIncident: false
  createIncident: true
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: Recipient
    columnName: Recipient_s
  - identifier: Subject
    columnName: Subject_s
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IP_s
suppressionDuration: 5h
customDetails:
  MsgId_s: MsgId_s
  fileName: fileName_s
  sha256: sha256_s
eventGroupingSettings:
  aggregationKind: SingleAlert
kind: Scheduled
name: Mimecast Secure Email Gateway - Attachment Protect
severity: High
requiredDataConnectors:
- dataTypes:
  - MimecastSIEM_CL
  connectorId: MimecastSIEMAPI
description: Detect threat for mail attachment under the targeted threat protection

ARM