In our previous articles we identified a network of front companies for APT activity in Hainan and showed their links to Hainan University academic Gu Jian. Although it was difficult to find people who work for these companies we identified a number of individuals and concluded that this network of companies was actually APT40. One of the individuals we identified, Ding Xiaoyang, is the owner of a phone number used on job adverts under the name Mr Chen.

Ding Xiaoyang’s role

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When we started we weren’t sure what Ding Xiaoyang’s role was.

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So we ran the numbers. How many Dings are there likely to be in Haikou, Hainan, and would it be possible to identify a specific Ding Xiaoyang among them?