Calling the scope of the attack "amazing," security researchers at F-Secure Friday said that 6.5 million Windows PCs have been infected by the "Downadup" worm in the last four days, and that nearly nine million have been compromised in just over two weeks.
Early Friday, the Finnish firm revised its estimate of the number of computers that had fallen victim to the worm, and explained how it came to the figure. "The number of Downadup infections [is] skyrocketing," Toni Koivunen, an F-Secure researcher, said in an entry to the company's Security Lab blog . "From an estimated 2.4 million infected machines to over 8.9 million during the last four days. That's just amazing."
On Tuesday, Koivunen put the number of infected systems at 2.4 million, then updated the estimate Wednesday to 3.5 million, an increase of 1.1 million in just 24 hours.
"We haven't seen outbreaks of this scale in many years," said Mikko Hypponen, chief research officer at F-Secure, in an e-mail reply to questions. "[It] reminds me of the old Loveletter/Melissa/Sasser/Blaster cases size-wise," he added, ticking off some of history's biggest malware attacks.
Downadup -- which also goes by the name "Conficker" -- exploits a bug in the Windows Server service used by Windows 2000, XP, Vista, Server 2003 and Server 2008. Although Microsoft fixed the flaw with one of its rare "out of cycle" updates in late October, about a third of all PCs have not yet been patched, according to Qualys Inc., another security company. Those PCs are the ones being hijacked by the worm.
In his Friday blog post, F-Secure's Koivunen also provided some background on the company's estimate, in part because some people had expressed disbelief in the number. According to Koivunen, F-Secure came to its 8.9 million-machine estimate by spying on the worm's communication with hacker-controlled servers.
Once it's gotten onto a PC, Downadup generates a list of possible domains, selects one, then uses that URL to reach a malicious server from which it downloads additional malware to install on the hijacked computer. F-Secure, however, has registered some of those domains, and has been able to monitor traffic through those URLs.
By examining logs of connection attempts to the domains, F-Secure discovered several hundred thousand different IP addresses -- over 350,000 as of today -- as well as a counter embedded in each that spells out the number of additional PCs that the infected machine has compromised.
"So this number tells us how many other computers this machine has exploited since it was last restarted," explained Koivunen. A sample log provided by F-Secure showed 12 Downadup-infected PCs, which collectively had infected 186 additional systems. Just one of the originally-infected computers successfully attacked 116 other machines.