The hackers are thought to be operating from Russia and appear to have at least loose connections with officials of the Russian government, people briefed on the matter said. It is unclear whether the other intrusions, at banks and brokerage firms, were as deep as the one that JPMorgan disclosed on Thursday. The banks security team, which first discovered the attack in late July, managed to block the hackers before they could compromise the most sensitive information about tens of millions of JPMorgan customers. Some American officials speculate that the breach was intended to send a message to Wall Street and the United States.”]
Source: https://dealbook.nytimes.com/2014/10/03/hackers-attack-cracked-10-banks-in-major-assault/