A building in a Shanghai suburb that is reportedly a center of cyberespionage.

It's highly unlikely that the Chinese government was not at least aware of the cyberattacks that targeted U.S. companies, organizations and government entities, said Kevin Mandia, CEO and founder of the security firm Mandiant, on CNBC "Squawk on the Street" Tuesday.

According to a Tuesday, research from Mandia's security experts indicates that the cyberattacks were coming from a location on the outskirts of Shanghai in a building that housed the People's Liberation Army Unit 61398 and is the base for its cyberwarriors.