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

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

ARM