Mimecast Audit - Logon Authentication Failed

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Id	f00197ab-491f-41e7-9e22-a7003a4c1e54
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	30m
Query period	30m
Trigger threshold	3
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
Version	1.0.1
Arm template	f00197ab-491f-41e7-9e22-a7003a4c1e54.json

KQL

MimecastAudit 
| where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
| extend   SourceIp = ['Source IP']

YAML

tactics:
- Discovery
- InitialAccess
- CredentialAccess
id: f00197ab-491f-41e7-9e22-a7003a4c1e54
name: Mimecast Audit - Logon Authentication Failed
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
version: 1.0.1
suppressionEnabled: false
description: Detects threat when logon authentication failure found in audit
queryFrequency: 30m
displayName: Mimecast Audit - Logon Authentication Failed
alertDetailsOverride: 
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
    lookbackDuration: P7D
  createIncident: true
alertRuleTemplateName: 
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: User
  entityType: Mailbox
- fieldMappings:
  - identifier: AppId
    columnName: Application
  entityType: CloudApplication
triggerThreshold: 3
query: |
  MimecastAudit 
  | where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
  | extend   SourceIp = ['Source IP']   
suppressionDuration: 5h
queryPeriod: 30m
eventGroupingSettings:
  aggregationKind: SingleAlert
severity: High
triggerOperator: gt
customDetails: 
kind: Scheduled
enabled: true
requiredDataConnectors:
- connectorId: MimecastAuditAPI
  dataTypes:
  - MimecastAudit
relevantTechniques:
- T1110

ARM