As Twitter struggled to return to normal Wednesday evening, a trickle of details suggested that the outage that left 30 million users unable to use the micro-blogging service for several hours, at least in part, may have been the result of a spam campaign that targeted a single user who vocally supports the Republic of Georgia.
According to Bill Woodcock, research director at the non-profit Packet Clearing House, the torrent of traffic that brought the site to its knees wasn't the result of a traditional DDoS, or distributed denial of service attack, but rather people who clicked on a link in spam messages that referenced a well-known blogger called Cyxymu.
As spam goes, the emails looked benign enough. One of them carried the subject "Visit my blog" and contained the words "thanks for looking at my blog" in the body. They contained respective links to Cyxymu's accounts on Twitter, Facebook, LiveJournal and YouTube, all of which also reported receiving abnormal amounts of traffic on Thursday.
"This was not like a botnet-style DDoS," Woodcock told The Register. "This was a joejob where people were just clicking on links in email and the people clicking on the links were not malefactors. They were just the sort of idiots that click on links in email without knowing what they are."
Joejobs are spam messages that are designed not to push Viagra but to induce someone to click on a link in the hopes of harming the site being linked to.
Twitter has so far said little on its blog and status page except that it spent much of the day fighting against a denial of service attack and that as late as 4:45 pm California time, latency problems caused some users to receive error pages. Company representatives didn't respond to emails seeking comment.
The theory was backed up by this article from CNET News, which quoted Facebook's security officer executive as saying the attacks targeting multiple websites all contained traffic linking to accounts held by Cyxymu.
"It was a simultaneous attack across a number of properties targeting him to keep his voice from being heard," Facebook's Max Kelly told reporter Elinor Mills. "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 made no reference to spam messages, so it remained unclear if the emails were the only cause of the mass requests to Cyxymu's profiles or if there were other causes as well.
Cyxymu has long been viewed as an antagonist by some pro-Russian supporters, who take issue with the blogger's coverage of recent military conflicts in Georgia.
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