The information came from an annual report released by China's National Computer Network Emergency Response Technical Team (CNCERT) on Monday.
The CNCERT said that in 2018, 14,000 servers in the US infected by a Trojan virus or botnet controlled 3.34 million host computers in China; and the number of servers increased 90.8 percent year-on-year, the Xinhua News Agency reported.
In 2018, 3,325 US IP addresses with the Trojan virus infected 3,607 Chinese websites, an increase of 43 percent compared with 2017, CNCERT said.
Aside from implanting viruses, the US has long been hacking information from the terminals of Chinese customers, and has been utilizing apps to tap, steal information and analyze the information they obtained, a Beijing-based military expert, who also specializes in cybersecurity, told the Global Times on Monday.
The increase of the attacks indicates that the US is preparing larger-scale cyber attacks against China, and could escalate to a "cyber war" to run concurrently with its trade war to prevent China's rapid development, experts said.
The CNCERT report proves that despite all the accusation from the US that China has been threatening its cybersecurity, the US itself is the biggest cyber attacker, the anonymous expert said.