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APT9 (also known as NIGHTSHADE PANDA and Red Pegasus) is a Chinese state-sponsored threat actor engaged in cyber espionage operations primarily targeting organizations in the United States, Japan, South Korea, and across Europe and Southeast Asia. The group focuses on intellectual property and competitive data theft, with a historically strong emphasis on the pharmaceuticals, biotechnology, healthcare, and aerospace sectors. APT9 employs a range of intrusion techniques including spearphishing, abuse of valid accounts, exploitation of trusted inter-organizational relationships, and a diverse malware toolkit comprising both publicly available and custom backdoors shared across multiple Chinese APT groups.