T1584.002 / ATT&CK

Adversaries may compromise third-party DNS servers that can be used during targeting. During post-compromise activity, adversaries may utilize DNS traffic for various tasks, including for Command and Control (ex: Application Layer Protocol). Instead of setting up their own DNS servers, adversaries may compromise third-party DNS servers in support of operations.

By compromising DNS servers, adversaries can alter DNS records. Such control can allow for redirection of an organization's traffic, facilitating Collection and Credential Access efforts for the adversary. Additionally, adversaries may leverage such control in conjunction with Digital Certificates to redirect traffic to adversary-controlled infrastructure, mimicking normal trusted network communications. Alternatively, they may be able to prove ownership of a domain to a SaaS service in order to assert control of the service or create a new administrative Cloud Account. Adversaries may also be able to silently create subdomains pointed at malicious servers without tipping off the actual owner of the DNS server.