LONDON — In a campaign that had some declaring the start of a “cyberwar,” hundreds of Internet activists mounted retaliatory attacks on Wednesday on the Web sites of multinational companies and other organizations they deemed hostile to the WikiLeaks antisecrecy organization and its jailed founder, Julian Assange.
Within 12 hours of a British judge’s decision on Tuesday to deny Mr. Assange bail in a Swedish extradition case, attacks on the Web sites of WikiLeaks’s “enemies,” as defined by the organization’s impassioned supporters around the world, caused several corporate Web sites to become inaccessible or slow down markedly.
Targets of the attacks, in which activists overwhelmed the sites with traffic, included the Web site of MasterCard, which had stopped processing donations for WikiLeaks; Amazon.com, which revoked the use of its computer servers; and PayPal, which stopped accepting donations for Mr. Assange’s group. Visa.com was also affected by the attacks, as were the Web sites of the Swedish prosecutor’s office and the lawyer representing the two women whose allegations of sexual misconduct are the basis of Sweden’s extradition bid.
The Internet assaults underlined the growing reach of self-described “cyberanarchists,” antigovernment and anticorporate activists who have made an icon of Mr. Assange, a 39-year-old Australian.
The speed and range of the attacks also appeared to show the resilience of the backing among computer activists for Mr. Assange, who has appeared increasingly isolated in recent months amid the furor stoked by WikiLeaks’s Web site posting of hundreds of thousands of secret Pentagon documents on the wars in Afghanistan and Iraq.
Mr. Assange has come under renewed attack in the past two weeks for posting the first tranche of a trove of 250,000 secret State Department cables that have exposed American diplomats’ frank assessments of relations with many countries, forcing Secretary of State Hillary Rodham Clinton to express regret to world leaders and raising fears that they and other sources would become more reticent.
The New York Times and four other news organizations last week began publishing articles based on the archive of cables made available to them.
In recent months, some of Mr. Assange’s closest associates in WikiLeaks abandoned him, calling him autocratic and capricious and accusing him of reneging on WikiLeaks’s original pledge of impartiality to launch a concerted attack on the United States. He has been simultaneously fighting a remote battle with the Swedish prosecutors, who have sought his extradition for questioning on accusations of “rape, sexual molestation and forceful coercion” made by the Swedish women. Mr. Assange has denied any wrongdoing in the cases.
American officials have repeatedly said that they are reviewing possible criminal charges against Mr. Assange, a step that could lead to a bid to extradite him to the United States and confront him with having to fight for his freedom on two fronts.
The cyberattacks in Mr. Assange’s defense appear to have been coordinated by Anonymous, a loosely affiliated group of activist computer hackers who have singled out other groups before, including the Church of Scientology. Last weekend, members of Anonymous vowed in two online manifestos to take revenge on any organization that lined up against WikiLeaks.
Anonymous claimed responsibility for the MasterCard attack in Web messages and, according to one activist associated with the group, conducted waves of attacks on other companies during the day. The group said the actions were part of an effort called Operation Payback, which began as a way of punishing companies that attempted to stop Internet file-sharing and movie downloads.
The activist, Gregg Housh, who disavows a personal role in any illegal online activity, said that 1,500 supporters had been in online forums and chat rooms organizing the mass “denial of service” attacks. His account was confirmed by Jose Nazario, a senior security researcher at Arbor Networks, a Chelmsford, Mass., firm that tracks malicious activity on computer networks.
Most of the corporations whose sites were targeted did not explain why they severed ties with WikiLeaks. But PayPal issued statements saying its decision was based on “a violation” of its policy on promoting illegal activities.
Almost all the corporate Web sites that were attacked appeared to be operating normally later on Wednesday, suggesting that any economic impact was limited. But the sense of an Internet war was reinforced when Netcraft, a British Internet monitoring firm, reported that the Web site being used by the hackers to distribute denial-of-service software had been suspended by a Dutch hosting firm, Leaseweb.
A sense of the belligerent mood among activists was given when one contributor to a forum the group uses, WhyWeProtest.net, wrote of the attacks: “The war is on. And everyone ought to spend some time thinking about it, discussing it with others, preparing yourselves so you know how to act if something compels you to make a decision. Be very careful not to err on the side of inaction.”
Mr. Housh acknowledged that there had been online talk among the hackers of a possible Internet campaign against the two women who have been Mr. Assange’s accusers in the Swedish case, but he said that “a lot of people don’t want to be involved.”
A Web search showed new blog posts in recent days in which the two women, identified by the Swedish prosecutors only as Ms. A. and Ms. W., were named, but it was not clear whether there was any link to Anonymous. The women have said that consensual sexual encounters with Mr. Assange became nonconsensual when condoms were no longer in use.
The cyberattacks on corporations Wednesday were seen by many supporters as a counterstrike against the United States. Mr. Assange’s online supporters have widely condemned the Obama administration as the unseen hand coordinating efforts to choke off WikiLeaks by denying it financing and suppressing its network of computer servers.
Mr. Housh described Mr. Assange in an interview as “a political prisoner,” a common view among WikiLeaks supporters who have joined Mr. Assange in condemning the sexual abuse accusations as part of an American-inspired “smear campaign.”
Another activist used the analogy of the civil rights struggle for the cyberattacks.
“Are they disrupting business?” a contributor using the name Moryath wrote in a comment on the slashdot.org technology Web site. “Perhaps, but no worse than the lunch counter sit-ins did.”
JOHN F. BURNS and RAVI SOMAIYA
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