A cyber crime syndicate known as Magecart, which is made up of dozens of sub-groups that indulge in credit card theft by skimming online payment forms, has been found to be implicated in more than two million such attacks.

Attackers who breached networks at India's second largest outsourcing company, Wipro, were part of a sophisticated campaign that used both commercial and open-source marketing tools to hit many organisations with phishing attacks. Most of these were firms that deal in gift cards.

The subscription site for Forbes magazine has been the victim of the card-skimming attack group Magecart, with the well-known website leaking card data on Wednesday until the attack was noticed and the site taken down.