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

ARM