The Win32/Alureon family of malware is a complex set of components which perform various functions. These include the modification of DNS settings, search hijacking, and click fraud. Alureon has existed for several years and has undergone a number of evolutionary changes. The ability to “infect” the miniport driver associated with the hard disk of the operating system is a recent notable change. This functionality first appeared around August 2009. For the most common system configuration (for machines using ATA hard disk drives) , the ATA miniport driver ‘atapi.sys’ is the file which is targeted.