Russian hackers may have attacked the U.S. financial system in mid-August, infiltrating and stealing data from JPMorgan Chase & Co. (JPM) and at least one other bank, an incident the FBI is investigating as a possible retaliation for government-sponsored sanctions.
The attack resulted in the loss of gigabytes of sensitive data, said the people, who asked not to be identified because the probe is still preliminary. Authorities are investigating whether recent infiltrations of major European banks using a similar vulnerability are also linked to the attack, one of the people said.
In one case, the hackers used a software flaw known as a zero-day vulnerability in one of the banks’ websites. They then plowed through layers of elaborate security to steal the data, a feat security experts said appeared far beyond the capability of ordinary criminal hackers.
“Companies of our size unfortunately experience cyber attacks nearly every day,” Patricia Wexler, a JPMorgan spokeswoman, said in an e-mail.
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