The US National Counterintelligence and Security Center (NCSC) has accused Iran, China and Russia as the top three spying nations that steal trade secrets, engage with state/corporate espionage and cyber attacks. The report particularly named the three countries as aggressive with maintaining their own state-funded cyber army of skilled hackers, capable of sustained corporate and government espionage. The NCSC has highlighted Russias role with the illegal penetration of ten US companies from the energy sector. The agency also has not ruled-out other countries other than the three mentioned in their report to get involved with massive cyber espionage sooner or later.”]
Source: https://hackercombat.com/the-top-three-states-that-are-engaged-in-cyber-espionage-ncsc/