The Cybersecurity and Infrastructure Security Agency is urging critical infrastructure owners and operators to plan for delivering essential services under emergency conditions – potentially for months at a time.

The federal government’s top cybersecurity agency warned that state-sponsored hackers, particularly two Chinese groups known as Salt Typhoon and Volt Typhoon, continue to threaten critical sectors like electricity, water, and internet. 

The agency is now working with the private sector to protect operational technology – the systems that control the heavy machinery and equipment that powers most critical infrastructure – from attacks that enter through business IT systems or third-party vendor products.

The initiative  — known as CI Fortify – will include CISA conducting targeted technical assessments of critical infrastructure entities and aims to create plans that “allow for safe operations for weeks to months while isolated” from IT networks and third-party tools, according to the agency’s website.

Nick Andersen, CISA’s acting director, told reporters that the goal is “service delivery [that] can still reach critical infrastructure after the asset owner has disconnected with IT and OT, disconnected from third party vendors and service provider connections and disconnected from third party telecommunications equipment.”

Over the past two years, wars in Ukraine, Gaza, Iran and elsewhere have seen water plants, power substations, data centers and other critical infrastructure targeted by kinetic or cyberattacks.

Andersen said the agency has already begun engaging with some companies to pilot the assessments and expects that work to ramp up considerably as CISA hires additional staff in the coming months.

He declined to name the entities involved in the pilot program, but said they will focus on organizations that support national security, defense, public health and safety and economic continuity. He added that CISA’s assessments will vary from sector to sector depending on their unique needs.

“Water isn’t necessarily designed to prioritize specific customer needs outside of recovery periods, while energy and transportation have more immediate tradeoffs for selecting one load or one set of cargo over another,” Andersen said as an example.

One pillar of CISA’s strategy is isolation: essentially turning off all third-party and business network connections to an OT network when facing an emergency or unknown vulnerability.

Organizations also need to develop an internal plan for what acceptable service levels look like under those conditions and reach understandings with their critical customers, like U.S. military installations and lifeline services.

The second pillar, recovery, involves best practices for organizations: backing up files, documenting systems and having manual backups for operations when normal computer systems are down.

In conversations with cybersecurity specialists who focus on critical infrastructure and operational technology, it is widely assumed that China is not the only nation to have broadly compromised Americans critical infrastructure. That hacking groups tied to other nations have almost surely noticed and exploited the same basic vulnerabilities and hygiene issues found by the Typhoons.

Agencies like the FBI and Federal Communications Commission have touted efforts to purge Chinese hackers and work voluntarily with telecoms to harden their network security. But U.S. national security officials and cybersecurity defenders have consistently said both Salt Typhoon and Volt Typhoon remain active threats to U.S. critical infrastructure.

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U.S. and international government agencies warned Thursday about a “widespread shift” in Chinese hacker methods toward the use of large-scale covert networks that compromise common devices to carry out a variety of attacks.

The advisory details how those networks work, and defensive steps organizations should take.

“Over the past few years there has been a major shift in the tactics, techniques and procedures (TTPs) used by China-nexus cyber actors, moving away from the use of individually procured infrastructure, and towards the use of externally provisioned, large-scale networks of compromised devices,” the warning reads.

The U.K. National Cyber Security Centre, Cybersecurity and Infrastructure Security Agency, National Security Agency, FBI and agencies from Australia, Canada, Germany, Netherlands, New Zealand, Japan, Spain and Sweden joined forces on the advisory.

It says that “multiple covert networks have been created and are being constantly updated, and that a single covert network could be being used by multiple actors. These networks are mainly made up of compromised Small Office Home Office (SOHO) routers, as well as Internet of Things (IoT) and smart devices.”

It continues: “Covert networks are used to connect across the internet in a low-cost, low-risk, deniable way, disguising the origin and attribution of malicious activity.”

Chinese information security companies create and support the networks, evidence suggests, according to the agencies. Hackers use the networks for reconnaissance, malware delivery and stealing information, they said.

Examples of the use of covert networks include activities from groups known as Volt Typhoon to pre-position on U.S. critical infrastructure, and Flax Typhoon to conduct cyber espionage.

An example of a covert network is the botnet Raptor Train, which infected 200,000 devices worldwide. The networks are large, constantly evolving and with new ones being developed constantly.

At a speech this week, NCSC CEO Richard Horne said “we know that China’s intelligence and military agencies now display an eye-watering level of sophistication in their cyber operations.”

Defenses against covert networks aren’t “straightforward,” according to the advisory, but include an assortment of common good cybersecurity practices. The largest and most at-risk organizations should engage in active hunting, tracking and mapping covert networks, using threat reporting to create blocklists and more.

“Working closely with U.S. and international partners, CISA continues to identify and warn organizations of Chinese state-sponsored cyber actors threatening critical infrastructure,” CISA Acting Director Nick Andersen said Thursday. “This advisory informs organizations of how these actors are strategically using numerous, evolving covert networks at scale for malicious cyber activity.”

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The U.S. government shouldn’t rigidly stick to traditional designations about which agency takes the lead on engaging with critical infrastructure sectors, the acting director of the Cybersecurity and Infrastructure Security Agency said Tuesday.

Sector risk management agency designations have long governed which agency is at the forefront of government efforts to protect each of the 16 critical infrastructure sectors, with CISA responsible for eight of them.

“When we look at our sector risk management agency construct, that’s important for a lot of reasons, It’s less important to abide by that strictly and say ‘CISA is the Sector Risk Management Agency for telecommunications,’” CISA’s Nick Andersen said at an event hosted by Auburn University’s McCrary Institute.

Rather, when responding to cyber incidents or undertaking other engagements with the private sector, the question should be who has the best relationship with a certain sector.

“We may have some owner-operators within a certain critical infrastructure sector that maybe the person they’re best positioned to receive resources from is us, or maybe it’s [Department of] Energy, or maybe it’s EPA, or maybe it’s FBI or NSA, or so forth and so on,” he said. “We just have to be comfortable with taking off those blinders and saying, ‘I don’t necessarily need to be in charge all the time no matter who I am. I just need to make sure that this owner-operator has the best partner teed up to lead that engagement.’”

The goal is to avoid another “Guam situation,” where “everybody was racing to Guam the last couple of years like kids chasing a soccer ball,” Andersen said. Guam was the site of critical infrastructure attacks on U.S. military bases that Microsoft pinned on the Chinese hacking group Volt Typhoon in 2023.

An attack on the telecommunications sector from another “Typhoon” group, Salt Typhoon, prompted questions about whether CISA’s hands are too full with all of its sector risk management agency responsibilities. House Homeland Security Chairman Andrew Garbarino, R-N.Y., raised concerns last year about how CISA handled its sector risk management agency role for the telecommunications sector after the Salt Typhoon campaign was uncovered.

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