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

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

ARM