TAG-121 is an Insikt Group designation for a separate cluster of North Korean-linked activity operating a network of front companies across China. The companies imitate legitimate information-technology firms by copying substantial portions of their websites, creating additional deniability and helping operators embed themselves in global IT supply chains. The activity forms part of a broader fraudulent remote-employment ecosystem used to obtain revenue, access, and proprietary information from international organizations. Workers may secure positions under false identities, while front companies and facilitators make their employment histories and business relationships appear credible. This access creates an insider threat: operators can steal sensitive data, introduce backdoors, or support wider cyber operations. Insikt Group identified suspected front companies spoofing firms in China, India, Pakistan, Ukraine, and the United States and assessed that clusters such as TAG-121 would continue exploiting remote work to threaten intellectual property and technology supply chains.