A series of DDoS attacks are carried out to put pressure on financial firms recently cut ties with the WikiLeaks site. Hacker group Anonymous has claimed responsibility for that claim is retaliation for WikiLeaks. This statement has been put over a message on Twitter. Attacks by his supporters on the site WikiLeaks to financial consequences more serious than people think. Anonymous group has called for volunteers to download software Loic (Low Orbit Ion Cannon), allowing them to control the system and denial of service attack (DdoS).

8/12/2010 evening, a spokesman for MasterCard official announcement about the incident of the service on their site. The MasterCard and Maestro transactions can not be done through code security system to authenticate online payments by the navigation error on the server of MasterCard. However, MasterCard said consumers can still use credit cards to conduct transactions, while providing full system restore service. Meanwhile, MasterCard is Visa's rivals also suffered a similar DDoS attacks and to stop online activities yesterday. According to Sean-Paul Correll, researcher of the Institute of PandaLabs, it seems the official website of the Visa suffered two consecutive attacks. The first attack occurred on the night of 7 / 12 cause service disruption for several hours. There are no groups claimed responsibility for this attack. Then, last night, the site continues to be knocked out by a DDoS attack others.

According to security analyst Paul mutton Netcraft, the site was shut down while Mastercard has a 400 computer was the target of Loic software, while 2,000 people with a Visa using the software. Visa.com is a goal more difficult, because unlike Mastercard.com, it was distributed via the Internet Akamai Technologies. It also said that Anonymous is the perpetrator of the attack on a series of trading system of MasterCard, Visa, PostFinance, PayPal, EveryDNS in recent days. This is a series of companies with online services in the United States, which severed relations with WikiLeaks in recent days.

Website of PostFinance Swiss bank, closed the account WikiLeaks earlier this week, also was attacked on 7 / 12. Yesterday, the site of Claes Borgstrom Swedish lawyer who represents two women in the lawsuit Julian Assange (Editor WikiLeak) on charges of rape, could not get into.
In addition, the group Anonymous also said attacks on Sen's website. Joseph Lieberman (I-Conn.), former Gov. Sarah Palin, and the site of the Swedish prosecutors who are prosecuting Julian Assange. Even Twitter danger of becoming the next target. Group "Campaign to retaliate," gave a message that: "Twitter, the next he will be the moderator for the discussion of Wikileaks."