Mimecast Audit - Logon Authentication Failed

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Id	f00197ab-491f-41e7-9e22-a7003a4c1e54
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	30m
Query period	30m
Trigger threshold	3
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
Version	1.0.1
Arm template	f00197ab-491f-41e7-9e22-a7003a4c1e54.json

KQL

MimecastAudit 
| where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
| extend   SourceIp = ['Source IP']

YAML

requiredDataConnectors:
- dataTypes:
  - MimecastAudit
  connectorId: MimecastAuditAPI
queryPeriod: 30m
triggerThreshold: 3
queryFrequency: 30m
suppressionDuration: 5h
severity: High
eventGroupingSettings:
  aggregationKind: SingleAlert
enabled: true
alertRuleTemplateName: 
description: Detects threat when logon authentication failure found in audit
name: Mimecast Audit - Logon Authentication Failed
kind: Scheduled
version: 1.0.1
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: User
  entityType: Mailbox
- fieldMappings:
  - identifier: AppId
    columnName: Application
  entityType: CloudApplication
triggerOperator: gt
id: f00197ab-491f-41e7-9e22-a7003a4c1e54
displayName: Mimecast Audit - Logon Authentication Failed
tactics:
- Discovery
- InitialAccess
- CredentialAccess
relevantTechniques:
- T1110
customDetails: 
suppressionEnabled: false
alertDetailsOverride: 
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
query: |
  MimecastAudit 
  | where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
  | extend   SourceIp = ['Source IP']   
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: P7D
    matchingMethod: AllEntities
    enabled: true
    reopenClosedIncident: false

ARM