Chinese APT deploys new malware to keep access to hacked networks

Source: BleepingComputer

Published: Fri, 05 Jun 2026 14:09:47 -0400

Summary

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. [...]

Sources

• BleepingComputer report
• BleepingComputer feed
• Lyrie threat desk