The United States and China are two major countries with malicious computer activity, Vincent Weafer, Vice President of Symantec Security Response, the largest maker of personal computer security software in the world, told Xinhua in an interview. He said cybercrime represents today's most prolific threat and cybercriminals are more determined than ever to steal confidential information. Attacks ... Computer security software maker Symantec Corp. said Monday that Stephen P. Bennett, former president and CEO of accounting software maker Intuit Inc., will join its board of directors effective Feb. 8. The forecast by Symantec, the biggest maker of computer security software, pushed down the shares as much as 5 percent. Jan. 27 (Bloomberg) -- Symantec Corp. , the biggest maker of computer security software, forecast fourth-quarter profit that failed to top some analysts’ estimates. Symantec Corp., the biggest maker of computer security software, forecast fourth-quarter profit that failed to top some analysts’ estimates.