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 [8.4] ›Detections and alerts ›Prebuilt rule reference

GCP Firewall Rule Creation

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GCP Firewall Rule Creation

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Identifies when a firewall rule is created in Google Cloud Platform (GCP) for Virtual Private Cloud (VPC) or App Engine. These firewall rules can be configured to allow or deny connections to or from virtual machine (VM) instances or specific applications. 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: 7 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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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 guide

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Rule query
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event.dataset:gcp.audit and event.action:(*.compute.firewalls.insert
or google.appengine.*.Firewall.Create*Rule)











Threat mapping
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Framework: MITRE ATT&CKTM














Rule version history
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Version 7 (8.4.0 release)








    

  • 

    Updated query, changed from:
    

    

    

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

    

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Version 5 (7.13.0 release)








    

  • 
Formatting only

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Version 4 (7.12.0 release)








    

  • 
Formatting only

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Version 3 (7.11.2 release)








    

  • 
Formatting only

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Version 2 (7.11.0 release)








    

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    Updated query, changed from:
    

    

    

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

    

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