Malware targeting point-of-sale (POS) systems has been a major trend for the last six months, with a flock of interrelated malware families being sold, shared, exchanged, tweaked and improved by the various denizens of the cyber underworld.

With easy pickings to be had from mom-and-pop shops, this pattern is only going to grow until people start fighting back with better system security, and ideally better payment card systems. Virus Bulletin's Technical Director John Hawes takes a look....