[New] GKE Kubernetes Rules

[Samirbous]

Convert some of our existing K8 rules https://github.com/elastic/detection-rules/tree/1e00f52d419d677ac52794e31ea1a63c97fd239b/rules/integrations/kubernetes to GCP K8 Audit logs. All queries validated against Zocalo dataset.

[github-actions]

Rule: New - Guidelines

These guidelines serve as a reminder set of considerations when proposing a new rule.

Documentation and Context

• Detailed description of the rule.
• List any new fields required in ECS/data sources.
• Link related issues or PRs.
• Include references.

Rule Metadata Checks

• creation_date matches the date of creation PR initially merged.
• min_stack_version should support the widest stack versions.
• name and description should be descriptive and not include typos.
• query should be inclusive, not overly exclusive, considering performance for diverse environments. Non ecs fields should be added to non-ecs-schema.json if not available in an integration.
• min_stack_comments and min_stack_version should be included if the rule is only compatible starting from a specific stack version.
• index pattern should be neither too specific nor too vague, ensuring it accurately matches the relevant data stream (e.g., use logs-endpoint.process-* for process data).
• integration should align with the index. If the integration is newly introduced, ensure the manifest, schemas, and new_rule.yaml template are updated.
• setup should include the necessary steps to configure the integration.
• note should include any additional information (e.g. Triage and analysis investigation guides, timeline templates).
• tags should be relevant to the threat and align/added to the EXPECTED_RULE_TAGS in the definitions.py file.
• threat, techniques, and subtechniques should map to ATT&CK always if possible.

New BBR Rules

• building_block_type should be included if the rule is a building block and the rule should be located in the rules_building_block folder.
• bypass_bbr_timing should be included if adding custom lookback timing to the rule.

Testing and Validation

• Provide evidence of testing and detecting the expected threat.
• Check for existence of coverage to prevent duplication.

[Copilot]

Pull request overview

This PR adds a new set of GKE-focused detection rules built on GCP Kubernetes audit logs (ported from existing Kubernetes audit rules), plus the necessary schema updates to support new non-ECS fields.

Changes:

• Introduces multiple new GKE detection rules covering privilege escalation, persistence, discovery, execution, and credential access scenarios using logs-gcp.audit-*.
• Adds an ES|QL aggregation rule to detect bursts of failed Kubernetes API requests.
• Extends non-ecs-schema.json with GCP audit field mappings used by the new rules.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
rules/integrations/gcp/privilege_escalation_gcp_gke_sensitive_hostpath_volume.toml	Detects pod specs mounting sensitive hostPath paths in GKE audit logs.
rules/integrations/gcp/privilege_escalation_gcp_gke_privileged_pod_created.toml	Detects pods created with allowPrivilegeEscalation: true.
rules/integrations/gcp/privilege_escalation_gcp_gke_pod_host_pid.toml	Detects HostPID enablement on pod create/update/patch events.
rules/integrations/gcp/privilege_escalation_gcp_gke_pod_host_network.toml	Detects HostNetwork enablement on pod create/update/patch events.
rules/integrations/gcp/privilege_escalation_gcp_gke_pod_host_ipc.toml	Detects HostIPC enablement on pod create/update/patch events.
rules/integrations/gcp/privilege_escalation_gcp_gke_excessive_linux_capabilities.toml	Detects dangerous Linux capability additions in pod create events.
rules/integrations/gcp/persistence_gcp_gke_cluster_admin_role_binding.toml	Detects modifications to a cluster-admin-related ClusterRoleBinding (logic/description mismatch flagged in comments).
rules/integrations/gcp/persistence_gcp_gke_admission_webhook_created_or_modified.toml	Detects admission webhook config changes; exclusion scoping issue flagged in comments.
rules/integrations/gcp/execution_gcp_gke_user_exec_into_pod.toml	New-terms rule for first-time user exec into pods.
rules/integrations/gcp/discovery_gcp_gke_suspicious_self_subject_review.toml	Detects service account/node self-subject review activity.
rules/integrations/gcp/discovery_gcp_gke_api_request_failure_burst.toml	ES
rules/integrations/gcp/credential_access_gcp_gke_secrets_list_unusual_source_asn.toml	New-terms rule for first-time secret listing from unusual ASN orgs; scoping tweak flagged in comments.
rules/integrations/gcp/credential_access_gcp_gke_secret_access_suspicious_user_agent.toml	Detects secrets get/list with suspicious user-agent fingerprints.
detection_rules/etc/non-ecs-schema.json	Adds logs-gcp.audit-* field mappings referenced by the new rules.

[Aegrah]

Amazing work, great effort. 🚀