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

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

ARM