As used in this chapter:
(a) “Advanced persistent threat” means an adversary with sophisticated levels of expertise and significant resources that allow it, through the use of multiple different attack vectors, including, but not limited to, cyber, physical, and deception, to generate opportunities to achieve its objectives that are typically to establish and extend its presence within the information technology infrastructure of organizations for purposes of exfiltrating information or to undermine or impede critical aspects of a mission, program, or organization or place itself in a position to do so in the future.