Hackers using malware which affects point-of-sale systems like cash registers and credit card machines could be on the rise as the software is relatively affordable and has the potential for huge profits. Icahn may have bought nearly a two percent stake in the tech company as he attempts to pressure it into spinning off its payment unit, PayPal. Economics Friday'seconomic calendarwill be relatively quiet with releases including Canadian CPI, British mortgage approvals, Italian retail sales and Spanish PPI.