T1578 Modify Cloud Compute Infrastructure

This diagnostic statement describes the implementation of least privilege principle, which can be applied to limiting permissions through role-based access controls, file and directory permissions, and the execution of systems and services. An adversary must already have high-level, admin or root level access on a local system to make full use of these ATT&CK techniques. Restrict users and accounts to the least privileges they require can help mitigate these techniques.

The diagnostic statement highlights several mechanisms that organizations can implement to protect endpoint systems using virtualization technologies, essentially hypervisor hardening. The creation of a new instance or VM is a common part of operations within many cloud environments. Establish centralized logging of instance activity, which can be used to monitor and review system events even after reverting to a snapshot, rolling back changes, or changing persistence/type of storage. Monitor specifically for events related to snapshots and rollbacks and VM configuration changes, that are occurring outside of normal activity. To reduce false positives, valid change management procedures could introduce a known identifier that is logged with the change (e.g., tag or header) if supported by the cloud provider, to help distinguish valid, expected actions from malicious ones.

This diagnostic statement describes how the organization ensures users are identified and authenticated before accessing systems, applications, and hardware, with logical access controls permitting access only to authorized individuals with legitimate business needs. Logical access controls in relation to systems can refer to the use of MFA, user account management, and other role-based access control mechanisms to enforce policies for authentication and authorization of user accounts.

The diagnostic statement highlights several mitigating controls that organizations can implement to protect endpoint systems using virtualization technologies. An adversary may attempt to modify a cloud account's compute service infrastructure to evade defenses. A modification to the compute service infrastructure can include the creation, deletion, or modification of one or more components such as compute instances, virtual machines, and snapshots. To aid in mitigating this technique, consider limiting user permissions to ensure only the expected users have the capability to modify cloud compute infrastructure components.

This diagnostic statement protects against Modify Cloud Compute Infrastructure through the use of hardened access control policies, secure defaults, password complexity requirements, multifactor authentication requirements, and removal of terminated accounts.

This control provides partial protection for all of its sub-techniques and therefore its coverage score factor is Partial, resulting in a Partial score.

Google Security Ops is able to trigger an alert based on changes to the infrastructure (e.g., VPC network changes). This technique was scored as minimal based on low or uncertain detection coverage factor. https://github.com/chronicle/detection-rules/blob/783e0e5947774785db1c55041b70176deeca6f46/gcp_cloudaudit/gcp_vpc_network_changes.yaral

Policy Intelligence role recommendations generated by IAM Recommender help admins remove unwanted access to GCP resources by using machine learning to make smart access control recommendations. With Recommender, security teams can automatically detect overly permissive access and rightsize them based on similar users in the organization and their access patterns. This control may mitigate adversaries that try to gain access to permissions from modifying infrastructure components.

SCC detect changes to the cloud infrastructure and resources which could indicate malicious behavior (e.g., delete instances, create snapshot, revert cloud instance). This security solution protects against modifications potentially used to remove evidence and evade defenses. Because of the near-real time temporal factor and high detection coverage this control was graded as significant.