"The AVAST Virus Lab has identified un-patched and often pirated versions of Windows XP as the main vector for rootkits infections. Data from a six-month study catalogued over 630,000 samples and found that 74 per cent of infections originated from Windows XP machines, compared to 17 per cent for Vista and only 12 per cent from Windows 7 machines. While Windows XP may be old, it is still the most common operating system around the globe with 49 per cent of Avast! antivirus users having it on their computers compared to the 38 per cent with Windows 7 and the 13 per cent with Vista."
"Microsoft is telling Windows users that they'll have to reinstall the operating system if they get infected with a new rootkit that hides in the machine's boot sector.
A new variant of a Trojan Microsoft calls "Popureb" digs so deeply into the system that the only way to eradicate it is to return Windows to its out-of-the-box configuration, Chun Feng, an engineer with the Microsoft Malware Protection Center (MMPC), said last week on the group's blog.
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