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

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

ARM