(Reuters) — The U.S. Department of Homeland Security and thousands of businesses scrambled Monday to investigate and respond to a sweeping hacking campaign that officials suspect was directed by the Russian government.

Emails sent by officials at DHS, which oversees border security and defense against hacking, were monitored by the hackers as part of the sophisticated series of breaches, three people familiar with the matter told Reuters Monday.

The attacks, first revealed by Reuters Sunday, also hit the U.S. departments of Treasury and Commerce. Parts of the Defense Department were breached, the New York Times reported late Monday night, while the Washington Post reported that the State Department and National Institutes of Health were hacked. Neither of them commented to Reuters.

“For operational security reasons, the DoD will not comment on specific mitigation measures or specify systems that may have been impacted,” a Pentagon spokesperson said.

Technology company SolarWinds, which was the key steppingstone used by the hackers, said up to 18,000 of its customers had downloaded a compromised software update that allowed hackers to spy unnoticed on businesses and agencies for almost nine months.

The United States issued an emergency warning on Sunday, ordering government users to disconnect SolarWinds software that it said had been compromised by “malicious actors.”

That warning came after Reuters reported suspected Russian hackers had used hijacked SolarWinds software updates to break into multiple U.S government agencies. Moscow denied having any connection to the attacks.

One of the people familiar with the hacking campaign said the critical network that DHS’ cybersecurity division uses to protect infrastructure, including the recent elections, had not been breached.

DHS said it was aware of the reports, without directly confirming them or saying how badly it was affected.

DHS is a massive bureaucracy responsible for securing distribution of the COVID-19 vaccine, among other things.

The cybersecurity unit there, known as CISA, has been upended by U.S. President Donald Trump’s firing of head Chris Krebs after Krebs called the recent presidential election the most secure in U.S. history. His deputy and the elections chief have also left.

SolarWinds said in a regulatory disclosure it believed the attack was the work of an “outside nation state” that inserted malicious code into updates of its Orion network management software issued between March and June this year.

“SolarWinds currently believes the actual number of customers that may have had an installation of the Orion products that contained this vulnerability to be fewer than 18,000,” it said.

The company did not respond to requests for comment about the exact number of compromised customers or the extent of any breaches at those organizations. It said it was not aware of vulnerabilities in any of its other products and was now investigating the matter, with help from U.S. law enforcement and outside cybersecurity experts.

SolarWinds boasts 300,000 customers globally, including the majority of the United States’ Fortune 500 companies and some of the most sensitive parts of the U.S. and British governments — such as the White House, defense departments, and both countries’ signals intelligence agencies.

Because the attackers were able to use SolarWinds to get inside a network and then create a new backdoor, merely disconnecting the network management program is not enough to boot the hackers out, experts said.

For that reason, thousands of customers are looking for signs of the hackers’ presence and trying to hunt down and disable those extra tools.

Investigators around the world are now scrambling to find out who was hit.

A British government spokesperson said the United Kingdom was not currently aware of any impact from the hack but was still investigating.

Three people familiar with the investigation into the hack told Reuters that any organization running a compromised version of the Orion software would have had a “backdoor” installed in their computer systems by the attackers.

“After that, it’s just a question of whether the attackers decide to exploit that access further,” one of the sources said.

Early indications suggest the hackers were discriminating about whose systems they chose to break into, according to two people familiar with the wave of corporate cybersecurity investigations being launched Monday morning.

“What we see is far fewer than all the possibilities,” one person said. “They are using this like a scalpel.”

FireEye, a prominent cybersecurity company that was breached in connection with the incident, said in a blog post that other targets included “government, consulting, technology, telecom, and extractive entities in North America, Europe, Asia, and the Middle East.”

“If it is cyber espionage, then it one of the most effective cyber espionage campaigns we’ve seen in quite some time,” FireEye intelligence analysis director John Hultquist said.

(Reporting by Jack Stubbs, Raphael Satter, Christopher Bing, and Joseph Menn. Editing by Lisa Shumaker.)


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