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

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

ARM