On February 23, Beijing Qi'an Pangu Laboratory Technology Co., Ltd. disclosed the complete technical details of the backdoor " Operation Electric Curtain (Bvp47) from the United States. According to Pangu lab, it is a top backdoor created by Equation, a leading hacker group affiliated with the US National Security Agency (NSA), which is used to spy on and control the network of victim organizations, and has invaded 45 countries and regions around the world.