China-Linked UAT-8099 Targets IIS Servers in Asia with BadIIS SEO Malware

Cybersecurity researchers have discovered a new campaign attributed to a China-linked threat actor known as UAT-8099 that took place between late 2025 and early 2026. The activity, discovered by Cisco Talos, has targeted vulnerable Internet Information Services IIS servers located across Asia, bu...

Dissecting UAT-8099: New persistence mechanisms and regional focus

Cisco Talos has identified a new campaign by UAT-8099, active from late 2025 to early 2026, that is targeting vulnerable Internet Information Services IIS servers across Asia with a specific focus on victims in Thailand and Vietnam. Analysis confirms significant operational overlaps between this...