IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elastic Security Solution [7.10] ›Detections and Alerts ›Prebuilt rule reference

GCP Firewall Rule Modification

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GCP Firewall Rule Modification

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Identifies when a firewall rule is modified 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 modify a firewall rule in order to weaken their target’s security controls.

Rule type: query

Rule indices:

  • filebeat-*

Severity: medium

Risk score: 47

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: 1

Added (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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

Investigation guide

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

Rule query

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

Threat mapping

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Framework: MITRE ATT&CKTM

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