Security researchers with U.S. cybersecurity firm Symantec said they have discovered a “highly sophisticated” Chinese hacking tool that has been able to escape public attention for more than a decade. The discovery was shared with the U.S. government in recent months, who have shared the information with foreign partners, said a U.S. official. Symantec, a division of chipmaker Broadcom, published its research about the tool, which it calls Daxin, on Monday. “It’s something we haven’t seen before,” said Clayton Romans, associate director with the U.S. Cybersecurity Infrastructure Security Agency (CISA). “This is the exact type of information we’re hoping to receive.” CISA highlighted Symantec’s membership in a joint public-private cybersecurity information sharing partnership, known as the JCDC, alongside the new research paper. The JCDC, or Joint Cyber Defense Collaborative, is a collective of government defense agencies, including the FBI and National Security Agency, and 22 U.S. technology companies that share …