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From moneynews.com
Iranian cyber warriors hacked the computer networks of Citi, Morgan, and Bank of America. The attacks which began late 2011 escalated and been directed at denial of service. The strategy was to overwhelm the websites with traffic that results in denial in service of other bona fide customers.
This was in apparent retaliation of Iranians after a virus disrupted the nuclear program by Stuxnet virus apparently developed by US.
It is not clear whether the attacks resulted in damage to the database or whether this was done by splinter groups or directed at national level..
Iranian hackers attack US banks