From the NYT:

Since September, intruders have caused major disruptions to the online banking sites of Bank of America, Citigroup, Wells Fargo, U.S. Bancorp, PNC, Capital One, Fifth Third Bank, BB&T and HSBC.

They employed DDoS attacks, or distributed denial of service attacks, named because hackers deny customers service by directing large volumes of traffic to a site until it collapses. No bank accounts were breached and no customers’ money was taken.

And the alleged culprit?

“There is no doubt within the U.S. government that Iran is behind these attacks,” said James A. Lewis, a former official in the State and Commerce Departments and a computer security expert at the Center for Strategic and International Studies in Washington.

Perhaps Iran’s way of reminding the USG that future Stuxnet-like attacks will come at a cost?