A pro-Georgian blogger with accounts on Twitter, Facebook, LiveJournal and Google's Blogger and YouTube was targeted in a denial of service attack that led to the site-wide outage at Twitter and problems at the other sites on Thursday, according to a Facebook executive.
The blogger, who uses the account name "Cyxymu," (the name of a town in the Republic of Georgia) had accounts on all of the different sites that were attacked at the same time, Max Kelly, chief security officer at Facebook, told CNET News.
"It was a simultaneous attack across a number of properties targeting him to keep his voice from being heard," Kelly said. "We're actively investigating the source of the attacks and we hope to be able to find out the individuals involved in the back end and to take action against them if we can."
Kelly declined to speculate on whether Russian nationalists were behind the attack, but said: "You have to ask who would benefit the most from doing this and think about what those people are doing and the disregard for the rest of the users and the Internet."
Twitter was down for several hours beginning early Thursday morning, and suffered periodic slowness and time-outs throughout the day.
Cyxymu's LiveJournal page wasn't accessible, but a cached version showed that it was updated on Thursday with a message about the denial of service (DOS) attacks on his accounts on the US-based sites. "Now it's obvious it's a special attack against me and Georgians," the message in Russian said.
The site also apologized for a spam e-mail attack in which the sender was spoofed and made to look like the e-mails were sent by him. Screen shots are shown. It's unclear whether or how the spam attack is related to the DOS attacks.
In the distributed denial of service (DDOS) attack on the sites, computers that have been compromised by viruses or other malware are instructed by the attacker's computer to visit the specific Web sites all at the same time and repeatedly. The barrage of connection requests overwhelms the target sites, making it so that legitimate Web traffic can't get through.
Such coordinated attacks require the efforts of tens of thousands or more of hijacked computers, which together form a botnet. Spammers send e-mails with malicious attachments or URLs to millions of people to create botnets. Criminals also can lease existing botnets for specific campaigns for as little as 5 cents to 10 cents per bot.
"The people who are coordinating this attack, the criminals, are definitely determined and using a lot of resources," Kelly said. "If they're asking our infrastructure to generate hundreds of pages a second, that's a lot of pages our users can't see."
Facebook and Google were able to minimize any impact to their sites. Facebook even managed to keep the Cyxymu account accessible to Web surfers from that region, Kelly said, although it was inaccessible to people in other geographic areas, including San Francisco.
This was the first coordinated attack on the sites, and all the companies involved were working closely on the investigation, he said. "My team and the teams that are working together at all these companies are doing a really good job very quickly and I'm proud and happy," he said.
Twitter and LiveJournal did not immediately return e-mails and calls seeking comment.
A Google spokesman offered this statement: "We are aware that a handful of non-Google sites were impacted by a DOS attack this morning, and are in contact with some affected companies to help investigate this attack. Google systems prevented substantive impact to our services."
Political and military conflicts between Russia and it former Republic spilled online last year with DOS attacks and Web site defacements going both directions.