Windows 7 Malware Rate High

Thursday, October 11, 2012 @ 06:10 PM gHale


Whether it is the price of popularity or just something targeted by attackers, but Windows 7’s malware infection rate climbed by as much as 182% this year, Microsoft officials said.

But even with that dramatic increase, Windows 7 remained two to three times less likely to fall to hacker attack than Windows XP.

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Data from Microsoft’s latest twice-yearly security report showed in the second quarter of 2012, Windows 7 was between 33% and 182% more likely to suffer a malware infection than in the second quarter of 2011.

The infection rate for Windows RTM, or “release to manufacturing,” the original version launched in Oct. 2009, was 33% higher this year for the 32-bit edition (x86), 59% higher for the 64-bit (x64) OS.

Windows 7 Service Pack 1 (SP1) — the upgrade that shipped in Feb. 2011 — saw even larger infection increases: 172% for x86, 182% for x64.

Microsoft blamed several factors for the boost in successful malware attacks, including less savvy users.

“This may be caused in part by increasing acceptance and usage of the newest consumer version of Windows,” said Microsoft in its latest Security Intelligence Report. “Early adopters are often technology enthusiasts who have a higher level of technical expertise than the mainstream computing population. As the Windows 7 install base has grown, new users are likely to possess a lower degree of security awareness than the early adopters and be less aware of safe online practices.”

But other elements came into play, said Tim Rains, director of Microsoft’s Trustworthy Computing group.

“There are several factors at play here. In XP, for example, we’ve seen infection rates go up because of particular pieces of malware that are more effective on that platform,” he said. “[And] in different places in the world, [users’] ability to keep Windows up to date varies greatly.”

For the first time, Microsoft ranked the threats facing each version of Windows, bolstering Rains’ assertion that some malware families are more successful against, or at least more often aimed at, specific Windows builds, and thus affect the infection rates.

But security researchers were more likely to pin the blame on Windows 7’s popularity.

“Windows 7 has really been the first platform adopted by both enterprises and consumers, and that kind of adoption hasn’t happened in quite some time for Microsoft,” said Andrew Storms, director of security operations at nCircle Security. “Given the market movements, its likely that the attackers follow.”

And Windows 7 is a more popular operating system this year: From June 2011 to June 2012, Windows 7’s usage share grew 45%, according to statistics from metric firm Net Applications.

Microsoft collects infection data from several sources, including the Malicious Software Removal Tool (MSRT), a free utility it distributes to all Windows users each month that detects, then deletes selected malware. It then normalizes the data by comparing an equal number of computers for each edition of Windows.

The measurements are X per thousand: Windows XP SP3’s infection rate, for instance, was 9.5 in the second quarter, or 9.5 XP SP3 machines out of every 1,000.

The x86 editions of Windows 7 RTM and SP1 came with higher infection rates than the x64 versions, and Windows 7 SP1 was less likely to suffer an infection than RTM. Windows 7 RTM x86 had the highest rate, 5.3, while Windows 7 SP1 x64 had the lowest, just 3.1.

But even with that low rate, Windows 7 SP1 x64 sported the largest year-to-year increase because in the second quarter of 2011, its infection rate was an even lower 1.1.



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