The Energy Department and National Nuclear Security Administration, which maintains the US nuclear weapons stockpile, has evidence of hackers accessing their networks as part of an extensive espionage operation that has affected at least half a dozen federal agencies. The investigators have been searching intricately through networks to know the extent to which the hackers were able to breach.
According to the recent reports they found suspicious activity in networks belonging to the Federal Energy Regulatory Commission (FERC), Sandia and Los Alamos national laboratories in New Mexico and Washington, the Office of Secure Transportation and the Richland Field Office of the DOE. The hackers have been able to do more damage at FERC than the other agencies, the officials said, but did not elaborate.
The officials familiar with the case as saying that the officials at DOE still do not know whether the attackers were able to access anything and the probe is ongoing and they may not know the full extent of the damage "for weeks."The hackers are believed to have gained access to the federal agencies' networks by compromising the software company SolarWinds, which sells IT management products to hundreds of governments and private-sector clients