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The infiltrations, which involved Yahoo e-mail accounts, appeared to be aimed at people who write about China and Taiwan, rendering their accounts inaccessible, according to those who were affected. In the case of this reporter, hackers altered e-mail settings so that all correspondence was surreptitiously forwarded to another e-mail address.
The attacks, most of which began last Thursday, occurred the same week that Google angered the Chinese government by routing Internet search engine requests out of the mainland to a site in Hong Kong. Google said the move was prompted by its objections to censorship rules and by a spate of attacks on Google e-mail users that the company suggested had originated in China.
Those cyberattacks, which began as early as last April, affected dozens of American corporations, law firms and individuals, many of them rights advocates critical of China’s authoritarian government.
The victims of the most recent intrusions included a law professor in the United States, an analyst who writes about China’s security apparatus and several print journalists based in Beijing and Taipei, the capital of Taiwan.
“It’s very unsettling,” said Clifford Coonan, the China correspondent for Variety magazine, whose e-mail account was rendered inaccessible last week after Yahoo detected that someone had gained access to it remotely. “You can’t help but wonder why you’ve been targeted.”
In an e-mail exchange, Dana Lengkeek, a Yahoo spokeswoman, declined to discuss the incidents, citing company policy. “We are committed to protecting user security and privacy and we take appropriate action in the event of any kind of breach,” Ms. Lengkeek said.
Kathleen McLaughlin, an American freelance journalist in Beijing, said she had been locked out of her Yahoo account since Thursday night. Like the others who were affected, Ms. McLaughlin said she received a message from Yahoo indicating that her account had been disabled because, according to an automated message, “we have detected an issue with your account.”
She said she contacted Yahoo but has yet to receive an explanation of what happened. “Someone is clearly targeting journalists,” she said. “It makes me feel very uncomfortable.”
Yahoo, which merged its China operations with the Chinese e-commerce company Alibaba, has faced criticism for cooperating with government security officials in the past. In 2006, Yahoo turned over data that officials used to help prosecute several dissidents. One, a journalist named Shi Tao, was later given a 10-year sentence for leaking a secret propaganda directive.
Unlike Google and Microsoft, Yahoo maintains servers in China, a factor that has driven many privacy-conscious Chinese away from the company’s e-mail services.
Computer security experts say infiltration of Yahoo’s e-mail service once again highlights the challenges that Internet companies face in protecting their customers from hackers.
Paul Wood, a senior analyst at the Symantec Corporation, said a growing number of malignant viruses were tailored to specific recipients, with the goal of tricking them into opening attachments that would insert malware onto their computers. Mr. Wood said his company, which designs anti-virus software, now blocks about 60 such attacks each day, up from 1 or 2 a week in 2005. “They’re very well crafted and extremely damaging,” he said.
A report issued by Symantec on Monday found that nearly 30 percent of attacks originated from computers in China; about 20 percent of those came from Shaoxing, a relatively obscure city in Zhejiang Province previously known for winemaking.
Mr. Wood and other experts point out that attacks appearing to come from a certain location can just as easily be emanating from computers infected with botnets, a virus that allows them be controlled remotely by other computing systems.
It is this kind of rogue software that is probably responsible for crippling the Web site of Chinese Human Rights Defenders, a group that has been an assertive critic of China’s human rights violations. Since last Thursday, the group’s Chinese-language site has been overwhelmed by hackers flooding it with junk requests, a tactic known as denial of service. Although the site has been attacked before, the attacks did not last more than a few hours.
Renee Xia, the international director for the human rights group, said the assault began the same day the American company that is host to its site, Go Daddy, announced that it would stop registering domain names in China. “Maybe it’s a coincidence, but we don’t think so,” Ms. Xia said.
Google Finds New Cyberattack
SAN FRANCISCO — Google said Tuesday that it had discovered a cyberattack aimed at Vietnamese Internet users around the world. The attack was less sophisticated than those that originated in China and appeared to be aimed at Chinese human rights activists.
Google said the attack may have infected the computers of tens of thousands of people who downloaded Vietnamese keyboard language software.
Source - [url=http://www.nytimes.com/2010/03/31/world/asia/31china.html]Journalists? E-Mails Hacked in China - NYTimes.com[/url]