"This is baseless. I've never heard of this, so I have no way to give a response," said the official, who declined to give his name.
Tsinghua University, known as "China's MIT," is closely connected to Tsinghua Holdings, a state-backed company focused on the development of various technologies, including artificial intelligence and robotics.
China's Defense Ministry did not respond to a request for comment.
Recorded Future gave a copy of its report to US law enforcement agencies. The FBI declined to comment.
It is unclear whether the targeted systems were compromised, but the highly focused, extensive and peculiar scanning activity indicates a "serious interest" in hacking them, said Priscilla Moriuchi, director of strategic threat development at Recorded Future and former head of the National Security Agency's East Asia and Pacific cyber threats office.