Volt Typhoon Used Covert Silent Train Network in Four Zero-Day Exploitation Campaigns

The China-nexus cyber espionage group Volt Typhoon has been attributed to a now-disrupted covert access network dubbed Silent Train, used for zero-day exploitation and strategic access. First identified in late 2023, Silent Train uses rotating chains of compromised SOHO, IoT, and enterprise infrastructure, according to Lumen Technologies Black Lotus Labs.