GCP Firewall Rule Creationedit

Identifies when a firewall rule is created in Google Cloud Platform (GCP). Virtual Private Cloud (VPC) firewall rules can be configured to allow or deny connections to or from virtual machine (VM) instances. An adversary may create a new firewall rule in order to weaken their target’s security controls and allow more permissive ingress or egress traffic flows for their benefit.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-gcp*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Cloud
  • GCP
  • Continuous Monitoring
  • SecOps
  • Configuration Audit

Version: 4 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positivesedit

Firewall rules may be created by system administrators. Verify that the firewall configuration change was expected. Exceptions can be added to this rule to filter expected behavior.

Investigation guideedit

The GCP Filebeat module must be enabled to use this rule.

Rule queryedit

event.dataset:(googlecloud.audit or gcp.audit) and
event.action:v*.compute.firewalls.insert

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 4 (7.12.0 release)
  • Formatting only
Version 3 (7.11.2 release)
  • Formatting only
Version 2 (7.11.0 release)
  • Updated query, changed from:

    event.dataset:googlecloud.audit and
    event.action:v*.compute.firewalls.insert