Leading cybersecurity companies say they have discovered a “highly sophisticated” malware used by Chinese hackers to attack government and key infrastructure targets. Symantec, the division of US software designer and maker of Broadcom, said the oldest known version of the malware, which has been dubbed Daxin, dates back to 2013, but Microsoft first documented the hacking tool in December 2013. A report from the company’s Threat Hunter Team states that Daxin is “without a doubt” the most advanced malware it has ever seen used “by an actor related to China. The unit says that Daxin was found along with other...