China’s ‘Typhoons’ changing the way FBI hunts sophisticated threats

Two major hacking groups have pushed the bureau to adapt how they respond to stealthier, more patient attacks, a top FBI official said.

Major cyber intrusions by the Chinese hacking groups known as Salt Typhoon and Volt Typhoon have forced the FBI to change its methods of hunting sophisticated threats, a top FBI cyber official said Wednesday.

U.S. officials, allied governments and threat researchers have identified Salt Typhoon as the group behind the massive telecommunications hack revealed last fall but that could have been ongoing for years. Investigators have pointed at Volt Typhoon as a group that has infiltrated critical infrastructure to cause disruptions in the United States if China invades Taiwan and Americans intervene.

Those hacks were stealthier than in the past, and more patient, said Jason Bilnoski, deputy assistant director of the FBI’s cyber division. The Typhoons have focused on persistent access and gotten better at hiding their infiltration by using “living off the land” techniques that involve using legitimate tools within systems to camouflage their efforts, he said. That in turn has complicated FBI efforts to share indicators of compromise (IOCs).

“We’re having to now hunt as if they’re already on the network, and we’re hunting in ways we hadn’t before,” he said at the Billington Cybersecurity Summit. “They’re not dropping tools and malware that we used to see, and perhaps there’s not a lot of IOCs that we’d be able to share in certain situations.”

The hackers used to be “noisy,” with an emphasis on hitting a target quickly, stealing data and then escaping, Bilnoski said. But now for nation-backed attackers, “we’re watching exponential leaps” in tactics, techniques and procedures, he said.

Jermaine Roebuck, associate director for threat hunting at the Cybersecurity and Infrastructure Security Agency, said his agency is also seeing those kinds of changes in the level of stealth from sophisticated hackers, in addition to “a significant change” in their intentions and targeting.

“We saw a lot of espionage over the last several years, but here lately, there’s been a decided shift into computer network attack, prepositioning or disruption in terms of capabilities,” he said at the same conference.

The targeting has changed as organizations, including government agencies, have shifted to the cloud. “Well, guess what?” he asked. “The actors are going toward the cloud” in response.

They’ve also focused on “edge devices,” like devices that supply virtual private network connections or other services provided by managed service providers, Roebuck said. Organizations have less insight into the attacks those devices and providers are facing than more direct intrusions, he said.

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