"Different cyber actors have different capabilities and different goals when conducting operations in Cyberspace," James R Clapper, Director of National Intelligence said in his remarks at an international cyber discussion at the Fordham University this week.
"Russia for example, has a broad range of highly sophisticated technical and human intelligence capabilities. Moscow's focus goes beyond just taking advantage of common vulnerabilities that can be fixed with a software patch, and in the event of a military conflict or geo-political crisis with Russia, some US critical infrastructure networks will be at risk," he said.
But we hear a lot more public discussion of the Chinese, because they, and now the North Koreans, are much noisier," he added.
"China has been robbing our industrial base blindly, largely with vulnerabilities that are easy to guard against or to simply fix. And that's one of the places where we can talk about a government and industry partnership," Clapper said.
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Clapper said most Chinese cyber intrusions are through well-known vulnerabilities that can be fixed with patches already available.
"A single breach shouldn't give attackers access to an entire network infrastructure and a mother lode of proprietary data," he said.
"The Chinese in particular are cleaning us out, because we know we're supposed to do those simple things, and yet we don't do them, "he said.
Clapper alleged that China's primary motivation is to catch up to and then surpass Western industrial and defense capabilities and to eventually pass by the US economy.
"The Chinese are focused on those goals, whereas the recent cyber attack from North Korea, which by the way is the most serious cyber attack ever made against US interests with potentially hundreds-of-millions of dollars and counting in damages, was driven by an entirely different philosophy," he said.