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Chinese APT deploys new malware to keep access to hacked networks

A Chinese espionage group tracked as UNC5221 has been accessing Microsoft 365 environments using the Brickstorm backdoor and previously undocumented malware named Plenet and AgentPSD.

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CONTENT OPTIMIZATION · AEO/GEO

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audit trail / provenance2

Provenance

Claims tie surfaced fields back to sources, models, or heuristics.

severity.upliftheuristicn/a
Active exploitation / in-the-wild language detected — floor raised to at least high.
severity.upliftheuristicn/a
Combined zero-day/exploit + ransomware/mass-impact signals → critical.

What changed

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Sources

https://www.bleepingcomputer.com/news/security/chinese-apt-deploys-new-malware-to-keep-access-to-hacked-networks/

Curated Jun 05, 2026 by Aidan Duffy, Threat intelligence editor, AHackaday./Methodology/Sources verified.

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social pulse

mentions (24h)164

velocitytrend flat

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platform splitX 0% · Reddit 0% · GitHub 100%

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cross-platform summaryLive chatter is accelerating; analysts are actively validating impact.