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

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

ARM