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

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

ARM