Elastic Security Detection Rules

GCP Firewall Rule Modification

Last updated 7 months ago on 2025-01-15
Created 5 years ago on 2020-09-21

About

Identifies when a firewall rule is modified in Google Cloud Platform (GCP) for Virtual Private Cloud (VPC) or App Engine. These firewall rules can be modified to allow or deny connections to or from virtual machine (VM) instances or specific applications. An adversary may modify an existing firewall rule in order to weaken their target's security controls and allow more permissive ingress or egress traffic flows for their benefit.
Tags
Domain: CloudData Source: GCPData Source: Google Cloud PlatformUse Case: Configuration AuditTactic: Defense EvasionLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Defense Evasion (TA0005)(opens in a new tab or window)

↳ Impair Defenses (T1562)(opens in a new tab or window)

False Positive Examples
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.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Query (Kibana Query Language)
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-gcp*
Related Integrations

gcp(opens in a new tab or window)

Query
event.dataset:gcp.audit and event.action:(*.compute.firewalls.patch or google.appengine.*.Firewall.Update*Rule)

Install detection rules in Elastic Security

Detect GCP Firewall Rule Modification in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).