NASDAQ Hackers Spied on Company Directors

Hackers who broke into the NASDAQ stock exchange's systems last year stole a lot more information than previously thought, sources close to the investigation tell Reuters. The hackers installed malware on a software program that corporate boards use to share documents and communicate with executives, which allowed them to spy on scores of company directors.

"God knows exactly what they have done. The long term impact of such an attack is still unknown," says a cybersecurity expert with experience protecting financial institutions. It's not clear how long the hackers had access to NASDAQ's systems before the attack was discovered late last year. The chief of the National Security Agency and US Cyber Command says the agency is working with NASDAQ to fend off further attacks. (More cybercrime stories.)