"We've all been watching China, but they're not the most advanced cybercriminals, " said Tom Kellermann, the former commissioner of President Barack Obama's cybersecurity council and head of security at Trend Micro.

CNN: Doug Gross,

Tom Kellermann, a former computer security official at the World Bank who now works at a firm called Core Security Technologies, said the most advanced hackers in the world are increasingly targeting financial institutions, particularly those involved in trading.

WSJ: Hackers Penetrate Nasdaq's Computers