Mimecast Secure Email Gateway - Spam Event Thread

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Id	df1b9377-5c29-4928-872f-9934a6b4f611
Rulename	Mimecast Secure Email Gateway - Spam Event Thread
Description	Detects threat from spam event thread protection logs
Severity	Low
Tactics	Discovery
Techniques	T1083
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_Spam_Event.yaml
Version	1.0.1
Arm template	df1b9377-5c29-4928-872f-9934a6b4f611.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"

YAML

suppressionDuration: 5h
queryFrequency: 5m
suppressionEnabled: false
queryPeriod: 15m
eventGroupingSettings:
  aggregationKind: SingleAlert
triggerOperator: gt
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_spameventthread"
enabled: true
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Spam_Event.yaml
tactics:
- Discovery
triggerThreshold: 0
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - identifier: Sender
    columnName: Sender_s
  - identifier: Recipient
    columnName: Recipient_s
  - identifier: Subject
    columnName: Subject_s
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
  dataTypes:
  - MimecastSIEM_CL
kind: Scheduled
relevantTechniques:
- T1083
customDetails:
  headerFrom: headerFrom_s
  MsgId_s: MsgId_s
  SenderDomain: SenderDomain_s
  SourceIP: SourceIP
  Route: Route_s
description: Detects threat from spam event thread protection logs
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: 1d
    enabled: true
  createIncident: true
name: Mimecast Secure Email Gateway - Spam Event Thread
version: 1.0.1
id: df1b9377-5c29-4928-872f-9934a6b4f611
severity: Low

ARM