LoFP / 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.

Techniques

• T1562

Sample rules

GCP Firewall Rule Creation

• source: elastic
• technicques:
  • T1562

Description

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.

Detection logic

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