Officials say it appears the hackers may been working as proxies for the Iranian government. Cyberattacks originating in Iran have been a persistent issue for U.S. government and businesses, particularly energy companies.
Officials would not discuss the details of the incident but said it was a low-level intrusion into the Navy Marine Corps Intranet.
Cybersecurity experts have said Iran has been escalating its efforts to infiltrate U.S. networks, but other intelligence officials said they have seen a fairly consistent level of activity.
The officials spoke on condition of anonymity because they were not authorized to discuss it by name.
The Wall Street Journal first reported the breach.
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