This is the best summary I could come up with:

The operation, announced just before FBI Director Chris Wray addressed House lawmakers, disrupted a botnet of hundreds of U.S.-based small office and home routers owned by private citizens and companies that had been hijacked by the Chinese hackers to cover their tracks as they sowed the malware.

“This is a world where a major crisis halfway across the planet could well endanger the lives of Americans here at home through the disruption of our pipelines, the severing of our telecommunications, the pollution of our water facilities, the crippling of our transportation modes — all to ensure that they can incite societal panic and chaos and to deter our ability” to marshal a sufficient response, she said.

At least a portion of that operation, attributed to a group of hackers known as Volt Typhoon, has now been disrupted after FBI and Justice Department officials obtained search-and-seizure orders in Houston federal court in December.

The U.S. has in the past few years become more aggressive in trying to disrupt and dismantle both criminal and state-backed cyber operations, with Wray warning Wednesday that Beijing-backed hackers aim to pilfer business secrets to advance the Chinese economy and steal personal information for foreign influence campaigns.

U.S. officials have long been concerned about such hackers hiding in U.S.-based infrastructure, and the end-of-life Cisco and NetGear routers exploited by Volt Typhoon were easy prey because they were no longer supported by their manufacturers with security updates.

Because of the urgency, law enforcement officials said, U.S. cyber operators deleted the malware in those routers without notifying their owners directly — and added code to prevent re-infection.

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