About one-third of the world's cyber attack traffic was traced back to China, according to a report by Akamai Technologies to be published today.
Between July and September of last year, about 33 percent of the attacks originated in China, double the percentage in the previous quarter, the report said.
The U.S. was the second-largest source with 13 percent. Next came Russia, Taiwan and Turkey, which each accounted for less than 5 percent of the attacks, according to the report by the Internet services company.
Corporate espionage, especially computer-data heists, has become a common practice in China, as Bloomberg Businessweek reported last year. In 2010, Google accused China of staging an attack on the company's network. China has been the top source of cyber attacks since the end of 2011, the Akamai report said.
Most of the attacks originating in China targeted a particular database system made by Microsoft, according to David Belson, who edited the report.
"It may have been a flareup in some sort of exploit that is trying to spread," Belson said in an interview.
The Akami report also contains the most recent list of countries and regions with the fastest Internet access. Check out the Bloomberg.com slideshow to learn more about the top 10.