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

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

ARM