Yomiuri Shimbun sources confirmed that Mt. Gox was hit by a massive DDoS attack that was separate from the attacks aimed at stealing bitcoins via malformed transactions. The DDoS attacks came prevalently from servers in the US and Europe, and it is unknown if the attackers were the same ones that took advantage of the flaw in the Bitcoin system.
Also this weekend hackers compromised the official blog and the Reddit account of Mt. Gox CEO Mark Karpeles, as well as some of the company's servers.
"Itís time that MTGOX got the bitcoin communities wrath instead of Bitcoin Community getting Goxed. This release would have been sooner, but in spirit of responsible disclosure and making sure all of ducks were in a row, it took a few days longer than would have liked to verify the data," they wrote in a message on Karpeles' blog, and offered a link to a 716 Mb archive containing "relevant database dumps, csv exports, specialized tools, and some highlighted summaries compiled from data," but no user database dumps.
According to Forbes, the file "appears to include an Excel spreadsheet of over a million trades, a file that purports to show the companyís balances in eighteen difference currencies, the backoffice application for some sort of administrative access to the databases of Mt. Goxís parent company Tibanne Limited, a screenshot of the hackersí access to those databases, a list of Mark Karpelesí home addresses and Karpelesí personal CV."
"In the hackersí summary of Mt. Goxís balances in various currencies, they point to a claimed balance of 951,116 bitcoins, which they take as evidence that Mark Karpelesí claim to have lost usersí digital currency to hackers is fraudulent," added Forbes' Andy Greenberg, but pointed out that is not evidence of Karpeles' involvement in the apparent theft.
He also noted that a user on the BitcoinTalk forum apparently tried to sell the Mt. Gox user database, complete with real names and passport scans, but whether he or she actually had the dump in question has not been confirmed.
Reading our newsletter every Monday will keep you up-to-date with security news.
Receive a daily digest of the latest security news.