The hacking collective “Anonymous,” known for its activism against big corporations, security forces, and governments, is specifically targeting central banks, according to two people with direct knowledge of the group’s activities, who asked not to be identified. While the people wouldn’t say which banks are being targeted, they said the group has been busy recruiting new hackers to aid it in its forays, and renewed its attack against a number of central banks in February. The group last year attacked at least eight monetary authorities, including the Dutch Central Bank, the Bank of Greece, and the Bank of Mexico, the two people said. In a change of tack, it is also considering plans to sell on any confidential information it obtains, according to one of the people. The actions by non-state hacking and hacktivist groups such as Anonymous “are a wake-up call that should alert us to the critical weaknesses of global financial systems,” said Prof. Stefano Zanero, Politecnico di Milano.