The Associated Press reports: Unit 61398 of the People’s Liberation Army has been recruiting computer experts for at least a decade. It has made no secret of details of community life such as badminton matches and kindergarten, but its apparent purpose became clear only when a U.S. Internet security firm accused it of conducting a massive hacking campaign against North American targets.

Hackers with the Chinese unit have been active for years, using online handles such as “UglyGorilla,” Virginia-based firm Mandiant said in a report released Tuesday as the U.S. prepared to crack down on countries responsible for cyber espionage. The Mandiant report plus details collected by The Associated Press depict a highly specialized community of Internet warriors working from a blocky white building in Shanghai:

—RECRUITING THE SPIES: Unit 61398, alleged to be one of several hacking operations run by China’s military, recruits directly from universities. It favors high computer expertise and English language skills. A notice dated 2003 on the Chinese Internet said the unit was seeking master’s degree students from Zhejiang University’s College of Computer Science and Technology. It offered a scholarship, conditional on the student reporting for work at Unit 61398 after graduation.

—CYBERSPY WORKPLACE: Mandiant says it traced scores of cyberattacks on U.S. defense and infrastructure companies to a neighborhood in Shanghai’s Pudong district that includes the 12-story building where Unit 61398 is known to be housed. The building has office space for up to 2,000 people. Mandiant estimates the number of personnel in the unit to be anywhere from hundreds to several thousand. [Continue reading…]