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

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

ARM