Megacorps view this stuff the same way they view the rampant theft at retail stores. It's a cost of doing business and it's passed on to competitors. It's only worth fighting to the extend that they can get a competitive advantage over their competitors to improve their margins. Given that the effort required to have a meaningful affect on the "hackers" is quite large and the return on that investment is quite small, it doesn't happen and the cost is just passed on to customers.
The White House is encouraging federal agencies to tighten their security, according to a White house spokesman quoted in Reuters today.
The chief executive of the International Cyber Security Protection Alliance (ICSPA) – sort of a law-enforcement version of NATO charged with helping member countries track and fight online attacks – said the McAfee report makes the threat of cyberwarfare irrefutable, apparently to those few people computer-savvy enough to spell "Internet" correctly without knowing that connecting "Internet" and "security" makes a cliched oxymoron more popular and more accurate even than pairing "military" and "intelligence."
Despite its mission to reinforce cybercrime units internationally, ICSPA boss John Lyons put the onus of self-protection on potential victims themselves:
"Businesses that have mainstream exposure to the Internet and that are dependent upon technology for their survival must now surely take the threat seriously," Lyons told Reuters.
Companies that have been breached need to get over their reluctance to admit the attacks and cooperate with each other and with law enforcement to help close gaps that could affect other companies as well, Lyons said.
Absolutely right; everyone involved in IT security has been saying exactly the same thing for 20 years. So far the only change in that reluctance is that companies hacked by non-state groups like Anonymous or LulzSec are now willing to admit it after the hactivists post irrefutable evidence of the attacks.
If someone else doesn't publicize an attack, most companies still avoid mentioning them for fear of copycat attacks and damage to their reputations or stock prices.