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Antino Backdoor Lets China-Linked UAT-11587 Turn Microsoft 365 Into a C2 Channel

Cisco Talos details UAT-11587, a China-linked group using the Antino backdoor and Microsoft 365 as cover to spy on Asian governments. Cisco Talos has been tracking a cluster of espionage activity since September 2025 that it calls UAT-11587, and by July 2026 …

By Pierluigi Paganini· Securityaffairs.com· 1 day ago· 2 min read
Antino Backdoor Lets China-Linked UAT-11587 Turn Microsoft 365 Into a C2 Channel