NASDAQ OMX, owners and operators of the NASDAQ Stock Exchange, reported this weekend that their systems had been infiltrated by unknown hackers. The hackers found suspicious files in a part of their US server that is not related to trading. NASDAQ s handles around 19 percent of stock trading in the US, which places it among power companies and air-traffic control companies. Investigators haven t identified a clear motive for the breach, but are working to prevent further breaches.
Source: https://threatpost.com/nasdaq-hack-raises-critical-infrastructure-concerns-020711/74914/