# Volt Typhoon Ran Covert "Silent Train" Network Across Four Zero-Day Campaigns

The China-linked espionage group Volt Typhoon operated a hidden relay network dubbed "Silent Train" to disguise its intrusions while exploiting four previously unknown zero-day vulnerabilities. The campaigns targeted victims while masking command-and-control traffic through the covert infrastructure. The findings matter because Volt Typhoon is tied to pre-positioning attacks against critical infrastructure, and the use of multiple zero-days signals a well-resourced, persistent threat.

**Importance:** 4/5

## Sources

### Security
- [The Hacker News](https://thehackernews.com/2026/10/volt-typhoon-used-covert-silent-train.html) — Wed, 28 Oct 2026 23:38:33 +0530