GCP Audit Logs - DNSSEC Disabled on Managed DNS Zone

GCPAuditLogs
| where ServiceName == "dns.googleapis.com"
| where MethodName in ("dns.managedZones.update", "dns.managedZones.patch")
| where GCPResourceType == "dns_managed_zone" and Severity == "NOTICE"
| extend 
    ResponseJson = parse_json(Response),
    RequestMetadataJson = parse_json(RequestMetadata),
    AuthInfoJson = parse_json(AuthenticationInfo)
| extend ZoneContext = ResponseJson.operation.zoneContext
| where isnotempty(ZoneContext)
| extend 
    OldDnsSecState = tostring(ZoneContext.oldValue.dnssecConfig.state),
    NewDnsSecState = tostring(ZoneContext.newValue.dnssecConfig.state)
| where OldDnsSecState == "ON" and NewDnsSecState == "OFF"
| extend 
    ManagedZoneName = extract(@"managedZones/([^/]+)", 1, GCPResourceName),
    DnsName = tostring(ResponseJson.managedZone.dnsName),
    ZoneId = tostring(ResponseJson.managedZone.id),
    ZoneDescription = tostring(ResponseJson.managedZone.description),
    Visibility = tostring(ResponseJson.managedZone.visibility),
    OperationId = tostring(ResponseJson.operation.id),
    CallerIpAddress = tostring(RequestMetadataJson.callerIp),
    AuthEmail = tostring(AuthInfoJson.principalEmail)
| extend 
    AccountName = tostring(split(PrincipalEmail, "@")[0]), 
    AccountUPNSuffix = tostring(split(PrincipalEmail, "@")[1])
| project TimeGenerated,
          PrincipalEmail,
          AuthEmail,
          ProjectId,
          ManagedZoneName,
          DnsName,
          ResourceName = GCPResourceName,
          Visibility,
          ZoneId,
          ZoneDescription,
          OperationId,
          CallerIpAddress,
          MethodName,
          ServiceName,
          Severity,
          LogName,
          InsertId,
          AccountName,
          AccountUPNSuffix

tags:
- GCP
- DNS
- DNSSEC
- Cloud Security
queryFrequency: 1h
kind: Scheduled
version: 1.0.0
relevantTechniques:
- T1562.001
- T1071.004
- T1584.002
alertDetailsOverride:
  alertDisplayNameFormat: DNSSEC Disabled on DNS Zone {{ManagedZoneName}} ({{DnsName}}) by {{PrincipalEmail}}
  alertDescriptionFormat: |-
    User {{PrincipalEmail}} disabled DNSSEC on DNS managed zone {{ManagedZoneName}} ({{DnsName}}).    
    This action removes cryptographic validation of DNS responses and may indicate an attempt to facilitate DNS-based attacks.
    Investigate immediately to determine if this change was authorized and assess potential security impact.
    Review DNS query logs for suspicious activity and consider re-enabling DNSSEC if unauthorized.    
triggerOperator: gt
customDetails:
  ResourceName: ResourceName
  ProjectId: ProjectId
  ZoneId: ZoneId
  Visibility: Visibility
  DnsName: DnsName
  ManagedZoneName: ManagedZoneName
status: Available
requiredDataConnectors:
- connectorId: GCPAuditLogsDefinition
  dataTypes:
  - GCPAuditLogs
id: 9129a43e-e204-4a9a-969e-d8861ce3437c
name: GCP Audit Logs - DNSSEC Disabled on Managed DNS Zone
query: |
  GCPAuditLogs
  | where ServiceName == "dns.googleapis.com"
  | where MethodName in ("dns.managedZones.update", "dns.managedZones.patch")
  | where GCPResourceType == "dns_managed_zone" and Severity == "NOTICE"
  | extend 
      ResponseJson = parse_json(Response),
      RequestMetadataJson = parse_json(RequestMetadata),
      AuthInfoJson = parse_json(AuthenticationInfo)
  | extend ZoneContext = ResponseJson.operation.zoneContext
  | where isnotempty(ZoneContext)
  | extend 
      OldDnsSecState = tostring(ZoneContext.oldValue.dnssecConfig.state),
      NewDnsSecState = tostring(ZoneContext.newValue.dnssecConfig.state)
  | where OldDnsSecState == "ON" and NewDnsSecState == "OFF"
  | extend 
      ManagedZoneName = extract(@"managedZones/([^/]+)", 1, GCPResourceName),
      DnsName = tostring(ResponseJson.managedZone.dnsName),
      ZoneId = tostring(ResponseJson.managedZone.id),
      ZoneDescription = tostring(ResponseJson.managedZone.description),
      Visibility = tostring(ResponseJson.managedZone.visibility),
      OperationId = tostring(ResponseJson.operation.id),
      CallerIpAddress = tostring(RequestMetadataJson.callerIp),
      AuthEmail = tostring(AuthInfoJson.principalEmail)
  | extend 
      AccountName = tostring(split(PrincipalEmail, "@")[0]), 
      AccountUPNSuffix = tostring(split(PrincipalEmail, "@")[1])
  | project TimeGenerated,
            PrincipalEmail,
            AuthEmail,
            ProjectId,
            ManagedZoneName,
            DnsName,
            ResourceName = GCPResourceName,
            Visibility,
            ZoneId,
            ZoneDescription,
            OperationId,
            CallerIpAddress,
            MethodName,
            ServiceName,
            Severity,
            LogName,
            InsertId,
            AccountName,
            AccountUPNSuffix  
queryPeriod: 1h
triggerThreshold: 0
description: |
  'Detects when DNSSEC (DNS Security Extensions) is disabled on a Google Cloud DNS managed zone.
  DNSSEC provides cryptographic authentication of DNS data, preventing DNS spoofing and cache poisoning attacks.
  Adversaries may disable DNSSEC to enable DNS-based command and control, phishing campaigns, or
  to redirect traffic to malicious infrastructure without cryptographic validation.
  This rule monitors DNS zone patch operations where DNSSEC state changes from ON to OFF.'  
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: PrincipalEmail
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: CallerIpAddress
- entityType: CloudApplication
  fieldMappings:
  - identifier: Name
    columnName: ProjectId
  - identifier: InstanceName
    columnName: ResourceName
- entityType: DNS
  fieldMappings:
  - identifier: DomainName
    columnName: DnsName
severity: High
tactics:
- DefenseEvasion
- CommandAndControl
- ResourceDevelopment
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google Cloud Platform Audit Logs/Analytic Rules/GCPDNSSECDisabledForDNSZone.yaml