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

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

ARM