The tool was designed for attacks against hardened networks in espionage campaigns against select governments and other critical infrastructure targets. Researchers at Symantec claim to have discovered a highly sophisticated tool, likely the most advanced ever to be linked with threat actors with ties to China. “It’s something we haven’t seen before. This is the exact type of information we’re hoping to receive,” Clayton Romans, associate director with the U.S. Cybersecurity Infrastructure Security Agency (CISA), told Reuters. Researchers claim there’s strong evidence to suggest that malware dubbed Backdoor.Dexin has been used as recently as November 2021 by attackers linked to…