SECURITY RESEARCHERS at Russian antivirus vendor Kaspersky Lab warn that TDSS, one of the most dangerous and widespread family of rootkits, recently received an update that forces infected computers to mine Bitcoins.

TDSS rootkits have consistently grown in sophistication since first appearing in 2008. The latest version known as TDL4 installs itself in the master boot record (MBR) and is capable of infecting all Windows versions, including 64-bit Windows Vista and Windows 7, which require signed device drivers.