Mimecast Secure Email Gateway - URL Protect

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Id	ea19dae6-bbb3-4444-a1b8-8e9ae6064aab
Rulename	Mimecast Secure Email Gateway - URL Protect
Description	Detect threat when potentially malicious url found
Severity	High
Tactics	InitialAccess Discovery Execution
Techniques	T1566
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_Url_Protect.yaml
Version	1.0.1
Arm template	ea19dae6-bbb3-4444-a1b8-8e9ae6064aab.json

KQL

MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"

YAML

queryPeriod: 15m
enabled: true
suppressionEnabled: false
triggerOperator: gt
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastSEG/Analytic Rules/MimecastSIEM_Url_Protect.yaml
name: Mimecast Secure Email Gateway - URL Protect
requiredDataConnectors:
- connectorId: MimecastSIEMAPI
  dataTypes:
  - MimecastSIEM_CL
suppressionDuration: 5h
id: ea19dae6-bbb3-4444-a1b8-8e9ae6064aab
version: 1.0.1
description: Detect threat when potentially malicious url found
relevantTechniques:
- T1566
entityMappings:
- entityType: MailMessage
  fieldMappings:
  - columnName: sender_s
    identifier: Sender
  - columnName: recipient_s
    identifier: Recipient
  - columnName: subject_s
    identifier: Subject
eventGroupingSettings:
  aggregationKind: SingleAlert
query: MimecastSIEM_CL| where mimecastEventId_s=="mail_ttp_url" and reason_s != "clean"
queryFrequency: 5m
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1d
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
customDetails:
  SourceIP: SourceIP
  url: url_s
  senderDomain: senderDomain_s
  credentialTheft: credentialTheft_s
  route: route_s
  urlCategory: urlCategory_s
  action: action_s
  MsgId_s: msgid_s
  reason: reason_s
kind: Scheduled
tactics:
- InitialAccess
- Discovery
- Execution
severity: High

ARM