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Microsoft Blames Hackers, Not Vulnerability, For Web Attack: Page 3 of 4

The group has accumulated hundreds of megabytes of stolen financial information, said Dunham, and sells it on the black market. Last week's attack was ultimately meant to deliver key loggers and Trojan horses to compromised users' machines to steal account information and credit-card numbers.

Nor is the group going to stop. "Even if they sell a credit-card number for just $1 to $3 a pop--and they have hundreds of megabytes of data--you do the math," Dunham said. "A million dollars in Russia is a lot of money. And they're able to recruit new members because they have an illicit business model that works."

In other words, expect more such attacks. "The potential for future attacks is real," Friedrichs said. "We could see them in a couple of days or a couple of weeks."

Until the unpatched vulnerability is fixed by Microsoft, users can rely on a combination of safe surfing practices and some technical workarounds to make sure they're secure.

Large, trusted commercial sites, said Symantec's Friedrichs, can be assumed to be patched against the IIS vulnerability, but smaller sites may not. "Use common sense when you surf," he advised.