While the extent and the timing of the attack isn’t precisely known, the evidence gathered by federal agents so far indicates the hackers were able to make a significant foray into JP Morgan’s computer system, people familiar with the investigation told the Wall Street Journal.
A separate report, from Bloomberg News, based on interviews with two people close to the probe, said the FBI was looking into the possibility that the hackers were based in Russia.
It was not known if the hack was done on the part on individuals or was state-sponsored.
Some investigators believe the sophistication of the attack and technical indicators retrieved from the probe point to some government link, Bloomberg reported. More