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

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

ARM