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

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

ARM