Cyber threats / Threat actors

UAT-9921

CN Suspected sponsor: China
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APAC targets
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Techniques
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Incidents
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News · 30d
Profile
Also known as: VoidLink Operator

UAT-9921 is a China-nexus threat actor active since 2019, tracked by Cisco Talos. In 2026, they were observed deploying 'VoidLink', a sophisticated modular framework primarily targeting Linux systems (IoT, Critical Infrastructure). Unique characteristics include the use of AI-enabled IDEs for rapid development (ZigLang implant, GoLang backend), P2P mesh networking for C2, and advanced persistence via eBPF rootkits. They target Technology and Financial sectors exploiting Java serialization vulnerabilities (Apache Dubbo).

ATT&CK techniques
MITRE ATT&CK has no technique mapping for this actor.
Incidents attributed
  • No incident in the register is attributed to this actor.
In the news
  • No Asia-Pacific article names this actor yet.
Targets
No victim countries in the sources.
Relevance to the EU
EU relevance: Low
No EU member state among its known victims and no overlap with EU projects
No EU cooperation projects recorded in its target countries.
References
Sources: MISP