China-linked threat actors have compromised some U.S. internet service providers (ISPs) as part of a cyber espionage campaign code-named Salt Typhoon.

The cyber campaign is attributed to the China-linked APT group Salt Typhoon, which is also known as FamousSparrow and GhostEmperor.

The Wall Street Journal reported that experts are investigating the security breach to determine if the attackers gained access to Cisco Systems routers, which are core network components of the ISP infrastructures.

“The hacking campaign, called Salt Typhoon by investigators, hasn’t previously been publicly disclosed and is the latest in a series of incursions that U.S. investigators have linked to China in recent years. The intrusion is a sign of the stealthy success Beijing’s massive digital army of cyberspies has had breaking into valuable computer networks in the U.S. and around the globe.”

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