An established group that steals data through phishing and card-skimming is using new infrastructure and activities to generate revenue, the security firm RiskIQ says, adding that it has named the group Fullz House based on its operations.

Security firm RiskIQ, which closely tracks incidences of online shopping sites being compromised, has put out a study in which it claims that Black Friday and Cyber Monday, the two big online shopping days, are sure to be in the sights of cyber criminals.

The number of blacklisted mobile apps in the 120-odd mobile stores, examined by security firm RiskIQ on a regular basis, grew from 44,850 to 53,955, a rise of 20%, the company said in its mobile threat report for the second quarter of the year.