In addition to comments from Department of Defense officials, the State Department said it has been tracking foreign influence operations tied to COVD-19 since January.
It's the latest U.S. government effort to turn the screws on Chinese telecommunications firms over national security concerns.
The WikiLeaks 2010 dump showed the U.S. government had been tracking the adversary for some time.
Hackers frequently take advantage of crises and current events to tailor their messages better.
The U.S. has increased cyber aid to Ukraine after Russia-linked cyberattacks on power grids in 2015 and 2016.
Thursday's announcement was the first time the U.S. government connected the GRU to the hacking group known as Sandworm.