China-Linked Cyber Espionage: How OP-512 Exploited Legacy IIS Servers and Evaded Detection

China-Linked Cyber Espionage: How OP-512 Exploited Legacy IIS Servers and Evaded Detection

June 10, 2026 · 23 min

About this episode

The episode discusses a China-linked cyber espionage campaign that exploited legacy IIS servers and evaded detection.

Your team built defenses around known China-linked clusters. The file hashes are tracked. The behavioral patterns are documented. What those weren't built to catch is a new cluster that studied those exact defenses and engineered around them. A China-linked attacker compromised an internet-facing IIS server, maintained access for over 75 days, and came back on fresh infrastructure. With four China-linked clusters converging on the same legacy IIS stack in twelve months, defenders building det...

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Organizations: China, IIS, OP-512

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