CTERA Mass Deletions Detection Analytic

id: 5365f294-0c67-432a-bacf-b1282a3b6c46
name: CTERA Mass Deletions Detection Analytic
description: 'This analytic rule detects and alerts when large amount of deletion operations generated by the CTERA Edge Filer'
kind: Scheduled
severity: High
status: Available
requiredDataConnectors:
  - connectorId: CTERA
    dataTypes:
      - Syslog
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: GreaterThan
triggerThreshold: 5000
tactics:
  - Impact
relevantTechniques:
  - T1485
query: |
    Syslog
    | where ProcessName == 'gw-audit'
    | extend
        TenantName = extract("\"vportal\":\"([^\"]*)\"", 1, SyslogMessage),
        UserName = extract("user=([^|]*)", 1, SyslogMessage),
        Permission = extract("op=([^|]*)", 1, SyslogMessage),
        EdgeFiler = extract("\"client\":\"([^\"]*)\"", 1, SyslogMessage),
        RootPath = extract("rootPath=([^|]*)", 1, SyslogMessage),
        Share = extract("share=([^|]*)", 1, SyslogMessage),
        LocalPath = extract("path=([^|]*)", 1, SyslogMessage),
        Timestamp = todatetime(extract("\"@timestamp\":\"([^\"]*)\"", 1, SyslogMessage))
    | where Permission == 'delete'
    | summarize Count = count() by UserName, bin(Timestamp, 5m)
    | where Count > 5000
incidentConfiguration:
    createIncident: true
    groupingConfiguration:
        enabled: false
        reopenClosedIncident: false
        lookbackDuration: PT5H
        matchingMethod: AllEntities
eventGroupingSettings:
    aggregationKind: SingleAlert
alertDetailsOverride:
    alertnameFormat: 'CTERA Batch Access Denied Detection'
    alertDescriptionFormat: >
      Detected {{Count}} denied access attempts by user {{UserName}} on Edge Filer 
      {{EdgeFiler}} within 5 minutes. Please investigate unauthorized access attempts or misconfigurations.
customDetails:
    TenantName: TenantName
    UserName: UserName
    EdgeFiler: EdgeFiler
    RootPath: RootPath
    Share: Share
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: UserName
  - entityType: File
    fieldMappings:
      - identifier: Name
        columnName: EdgeFiler
suppressionDuration: PT5H
suppressionEnabled: false
version: 1.0.0