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

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

ARM