An audit has found that recent cyber attacks targeting the U.S. Department of Energy cost more than $2 million to repair.

"The compromises, which occurred at four department locations, were not described in detail, but were deemed 'successful' for adversaries, according to the annual audit required by the Federal Information Security Management Act (FISMA)," writes SC Magazine's Angela Moscaritolo.

"Three of the four attacks caused an estimated $2 million in damages," Moscaritolo writes. "The audit did not reveal the estimated impact of the fourth."

Go to "Recent attacks cost Energy Department at least $2M" to read the details.

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