A sign for the National Security Agency (NSA), US Cyber Command and Central Security Service is seen near the visitor's entrance to the headquarters of the National Security Agency (NSA) in Fort Meade, Maryland, Feb 14, 2018. (SAUL LOEB / AFP)

BEIJING - China on Tuesday released a new investigation report in which it said further evidence has been found to show the US National Security Agency (NSA) is behind "thousands of cyber attacks" on a Chinese university.

Chinese experts have found that the attacks against China's Northwestern Polytechnical University originated from the US National Security Agency-affiliated Office of Tailored Access Operation (TAO), which had exposed its own technical loopholes and operational missteps during the attack, according to the report published by China's National Computer Virus Emergency Response Center in collaboration with internet security company 360

With the technical support from a number of European and Southeast Asian countries, Chinese experts were able to retrace the technical features, attack weapons and paths used in the cyber attack against China's Northwestern Polytechnical University, according to the report published by China's National Computer Virus Emergency Response Center in collaboration with internet security company 360.

They have found that those attacks originated from the NSA-affiliated Office of Tailored Access Operation (TAO), which had exposed its own technical loopholes and operational missteps during the attack, the report showed.

Earlier probe has found that 41 types of cyber weapons were used by TAO in the recently exposed cyber attacks against the university.

Among the 41 types of cyber attack tools, 16 are identical to the TAO's weapons that have been exposed by hacker group "Shadow Brokers," and 23 share a 97 percent genetic similarity with those deployed by TAO, according to the report.

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The remaining two types need to be used in conjunction with other cyber attack weapons of TAO, the report added, adding that the homology of the weapons suggests they all belong to TAO.

Technical analysis found that the cyber attackers' working time, language and behavior habits, and operation miss have also exposed their links with TAO.

The report detailed the process of TAO's infiltration into the Chinese university's internal network. TAO first used "FoxAcid," a man-in-the-middle attack platform, to hack into the university's internal host computer and servers, and then gained control over several key servers with remote control weapons. It then controlled some important network node equipment including the university's internal routers and switches, and stole authentication data.

Hiding in the university's operation and maintenance servers, TAO stole several key configuration files of network equipment, which were used to "validly" monitor a batch of network equipment and internet users.

The Chinese investigation team found that TAO captured personal information of some people with sensitive identity on the Chinese mainland. The information was sent back to headquarters of the NSA via multiple jump servers.

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The report showed the true identities of 13 attackers have been found out.

The report, revealing details of the US cyber attacks against the Chinese university, was released to offer lessons to countries across the world so that they can more effectively identify and prevent cyber attacks by TAO.