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

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

ARM