Foreign computer intrusion

The use or attempted use of any cyber-activity or other means, by, for, or on behalf of a foreign power to scan, probe, or gain unauthorized access into one or more U.S.-based computers. (AG Guidelines for Domestic FBI Operations, 29 Sep 2008).

Source: Terms & Definitions of Interest for DoD Counterintelligence Professionals, Office of the National Counterintelligence, https://www.dni.gov/files/NCSC/documents/ci/CI_Glossary.pdf