JPMorgan Chase and at least four other US banks were struck by hackers in a series of coordinated attacks in August. The hackers infiltrated the networks of the banks, siphoning off gigabytes of data, including checking and savings account information, in what security experts described as a sophisticated cyberattack. The F.B.I. is involved in the investigation, and in the past few weeks a number of security firms have been brought in to conduct forensic studies of the penetrated computer networks. According to sources, hackers infiltrated the computer networks of some banks and stole checking and savings account information from clients. It was not clear whether the attacks were financially motivated, or if they were collecting intelligence as part of an espionage effort. The FBI is investigating a possible data breach at JPMorgan Chase. A spokesperson for JPMrgan Chase said companies of its size experience cyberattacks ‘nearly every day’ and have ‘multiple layers of defense’, but did not offer any details on the matter.
