Until just a few weeks ago, executives at JPMorgan said they believed that only one million accounts were affected, according to several people with knowledge of the attacks.
As the severity of the intrusion — which began in June but was not discovered until July — became more clear in recent days, bank executives scrambled for the second time in three months to contain the fallout and to reassure skittish customers that no money had been taken and that their financial information remained secure.
The hackers appeared to have obtained a list of the applications and programs that run on JPMorgan's computers — a road map of sorts — which they could crosscheck with known vulnerabilities in each program and web application, in search of an entry point back into the bank's systems, according to several people with knowledge of the results of the bank's forensics investigation, all of whom spoke on the condition of anonymity.
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