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

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

ARM