US Banks Cybercrime Risk
Following major data breaches at banks like JPMorgan Chase, cybercrime is now seen by many as the No. 1 risk to the industry. Getty Images/Stan Honda

Four men allegedly connected to an attack on JPMorgan that compromised the information of 83 million customers were named Tuesday in federal indictments. Gery Shalon, Joshua Samuel Aaron and Ziv Orenstein face 23 charges stemming from a scheme that involved infiltrating JPMorgan as well as several other financial institutions and news outlets. Anthony Murgio was charged in a separate indictment.

The "sprawling cybercriminal enterprise," lasting from 2012 to 2015, involved stock manipulation, money laundering and identity theft, according to the office of U.S. Attorney Preet Bharara. One of the defendants allegedly directed the intrusions at target companies.

Murgio had previously been charged with money laundering in connection with, a bitcoin exchange that federal authorities said helped criminals launder cash. An FBI memo had named Murgio in connection with the JPMorgan attack.

The hack at JPMorgan, made public in October 2014, was the largest breach of an American financial institution on record. A spokesperson confirmed to Bloomberg that JPMorgan was the bank in question in the indictment. The hackers also targeted Wall Street Journal parent company Dow Jones & Co.

Nine institutions and more than 100 million customers were affected, the indictment said. Prosecutors have previously described a scheme in which the defendants artificially inflated stock prices in part through spam emails sent to millions of potential investors.