Mimecast Audit - Logon Authentication Failed

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Id	9c5dcd76-9f6d-42a3-b984-314b52678f20
Rulename	Mimecast Audit - Logon Authentication Failed
Description	Detects threat when logon authentication failure found in audit
Severity	High
Tactics	Discovery InitialAccess CredentialAccess
Techniques	T1110
Required data connectors	MimecastAuditAPI
Kind	Scheduled
Query frequency	5m
Query period	15m
Trigger threshold	3
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic Rules/MimecastAudit.yaml
Version	1.0.0
Arm template	9c5dcd76-9f6d-42a3-b984-314b52678f20.json

KQL

MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"

YAML

triggerThreshold: 3
name: Mimecast Audit - Logon Authentication Failed
alertDetailsOverride: 
description: Detects threat when logon authentication failure found in audit
kind: Scheduled
queryFrequency: 5m
relevantTechniques:
- T1110
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic Rules/MimecastAudit.yaml
customDetails: 
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: 1d
    enabled: true
    matchingMethod: AllEntities
  createIncident: true
apiVersion: 2021-09-01-preview
suppressionDuration: 5h
triggerOperator: gt
version: 1.0.0
displayName: Mimecast Audit - Logon Authentication Failed
alertRuleTemplateName: 
requiredDataConnectors:
- connectorId: MimecastAuditAPI
  dataTypes:
  - MimecastAudit_CL
suppressionEnabled: false
id: 9c5dcd76-9f6d-42a3-b984-314b52678f20
query: MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"
severity: High
queryPeriod: 15m
tactics:
- Discovery
- InitialAccess
- CredentialAccess
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: src_s
    identifier: Address
- entityType: Mailbox
  fieldMappings:
  - columnName: user_s
    identifier: MailboxPrimaryAddress
- entityType: CloudApplication
  fieldMappings:
  - columnName: app_s
    identifier: AppId
enabled: true
eventGroupingSettings:
  aggregationKind: SingleAlert

ARM