Microsoft Security Intelligence Report volume 7 (January - June 2009)

On 11/2/2009 Microsoft published it's Security Intelligence Report.

Microsoft published that Windows XP users experienced significantly more security violations compared to Window Vista users and that the Conficker infections is the top threat in enterprise environments but not even in the top 10 in home computing environments.

Microsoft from their statistical data points out that there are differences in the types of threats per country while the U.S. and UK seem to have a high presence in Win32/Alureon and Win32/Vundo while some EU countries saw Win32/Wintrim as most active and in China Win32/BaiuSobar, Win32/Frethog also in Brazil it is Win32 Bancos.
Client side and Server Side Polymorphic Viruses seem to account for the large amount of the Virus Misc variations, polymorphic viruses can mutate its structure to avoid detection by antivirus programs. It can mutate usually by changing a variable or variables in its code without changing its overall algorithm.

There is a lot of interesting data published in this report that is about 232 pages long with information about organizations that are actively involved in mitigating exploits.

Image via Wikipedia

Microsoft Security Intelligence Report

References:
Conficker Working Group