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

ARM