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Cyberattacks that threaten the U.S. infrastructure are "growing in sophistication" and often linked to hostile states, according to federal authorities.

Cyberattacks against water utilities across the country are becoming more frequent and more severe, the Environmental Protection Agency warned Monday as

National Cyber Director Harry Coker noted that the U.S. has intensified defending its critical infrastructure amid mounting cyber threats posed by Chinese state-sponsored threat operations, including Volt Typhoon, CyberScoop reports.

Multiple Chinese cyberespionage groups, including Volt Typhoon, are using operational relay box networks, aka ORBs, built using leased proxy servers and compromised

BleepingComputer reports that more Chinese state-sponsored threat actors have been using massive operational relay box networks, or proxy networks of botnets, to facilitate cyberespionage efforts.