In October 2010, a Federal Bureau of Investigation system monitoring U.S. Internet traffic picked up an alert. The signal was coming from Nasdaq (NDAQ). It looked like malware had snuck into the company’s central servers.
more here.............http://www.businessweek.com/articles/2014-07-17/how-russian-hackers-stole-the-nasdaq
more here.............http://www.businessweek.com/articles/2014-07-17/how-russian-hackers-stole-the-nasdaq