A Chinese espionage group has been using new malware to maintain access to compromised networks. This group has been tracked and identified as UNC5221, and has been using the Brickstorm backdoor along with other previously undocumented malware. The malware used by the group includes Plenet and AgentPSD, which have been deployed to access Microsoft 365 environments. This development indicates the group's efforts to sustain their presence in hacked networks.

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