Mimecast Audit - Logon Authentication Failed

Back


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

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

ARM