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

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

ARM