Mimecast Audit - Logon Authentication Failed

Back


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

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

ARM