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

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

ARM