An attack on a big bank by a nation-state could be conducted to amass intelligence to help that country protect or boost its economy, help its businesses to compete against the target bank and others institutions. The top financial firms all have quite of a bit of intelligence because they need to know what their risk exposure is and how it is changing in very real terms,” says Allan Friedman, co-author of Cybersecurity and Cyberwar: What Everyone Needs to Know. The Russian government might be behind the apparent attacks, in part, as payback to the U.S. for imposing sanctions on the Russian government.”]
Source: https://www.cuinfosecurity.com/blogs/a-nation-state-would-hack-jpmorgan-p-1729