Mimecast Secure Email Gateway - Attachment Protect

Back


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

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

ARM