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The cyberextortion attempt that has forced the shutdown of a vital pipeline in the United States was carried out by a criminal gang known as DarkSide that cultivates a Robin Hood image of stealing from corporations and giving a cut to charity, two people close to the investigation said Sunday.

The聽shutdown, meanwhile, stretched into its third day, with the Biden administration saying an 鈥渁ll-hands-on-deck鈥� effort is underway to restore operations and avoid disruptions in the fuel supply.

Experts said that聽gasoline prices聽are unlikely to be affected if the pipeline is back to normal in the next few days but that the incident 鈥� the worst cyberattack to date on critical U.S. infrastructure 鈥� should serve as a wake-up call to companies about the vulnerabilities they face.

The pipeline, operated by Georgia-based Colonial Pipeline, carries gasoline and other fuel from Texas to the Northeast. It delivers roughly 45% of fuel consumed on the East Coast, according to the company.

It was hit by what Colonial called聽a ransomware attack, in which hackers聽typically lock up computer systems by encrypting data, paralyzing networks, and then demand a large ransom to unscramble it.

On Sunday, Colonial Pipeline said it was actively in the process of restoring some of its IT systems. It says it remains in contact with law enforcement and other federal agencies, including the Department of Energy, which is leading the federal government response. The company has not said what was demanded or who made the demand.

However, two people close to the investigation, speaking on condition of anonymity, identified the culprit as DarkSide. It is among ransomware gangs that have 鈥減rofessionalized鈥� a criminal industry that has cost Western nations tens of billions of dollars in losses in the past three years.

DarkSide claims that it does not attack hospitals and nursing homes, educational, or government targets and that it donates a portion of its take to charity. It has been active since August and, typical of the most potent ransomware gangs, is known to avoid targeting organizations in former Soviet bloc nations.

Colonial did not say whether it has paid or was negotiating a ransom, and DarkSide neither announced the attack on its dark web site nor responded to an Associated Press reporter鈥檚 queries. The lack of acknowledgment usually indicates a victim is either negotiating or has paid.

On Sunday, Colonial Pipeline said it is developing a 鈥渟ystem restart鈥� plan. It said its main pipeline remains offline but some smaller lines are now operational.

鈥淲e are in the process of restoring service to other laterals and will bring our full system back online only when we believe it is safe to do so, and in full compliance with the approval of all federal regulations,鈥� the company said in a statement.

聽said Sunday that ransomware attacks are 鈥渨hat businesses now have to worry about,鈥� and that she will work 鈥渧ery vigorously鈥� with the Department of Homeland Security to address the problem, calling it a top priority for the administration.

鈥淯nfortunately, these sorts of attacks are becoming more frequent,鈥� she said on CBS鈥� 鈥淔ace the Nation.鈥� 鈥淲e have to work in partnership with business to secure networks to defend ourselves against these attacks.鈥�

She said President Joe Biden was briefed on the attack.

鈥淚t鈥檚 an all-hands-on-deck effort right now,鈥� Ms. Raimondo said. 鈥淎nd we are working closely with the company, state, and local officials to make sure that they get back up to normal operations as quickly as possible and there aren鈥檛 disruptions in supply.鈥�

The Department of Transportation said it would relax hours-of-service regulations for drivers carrying gasoline, diesel, jet fuel, and other refined petroleum products, allowing them to work extra or more flexible hours to make up for any fuel shortage related to the pipeline outage. That applies to drivers carrying fuel to 17 states and the District of Columbia.

One of the people close to the Colonial investigation said that the attackers also stole data from the company, presumably for extortion purposes. Sometimes stolen data is more valuable to ransomware criminals than the leverage they gain by crippling a network, because some victims are loath to see sensitive information of theirs dumped online.

Security experts said the attack should be a warning for operators of critical infrastructure 鈥� including electrical and water utilities and energy and transportation companies 鈥� that not investing in updating their security puts them at risk of catastrophe.

Ed Amoroso, CEO of TAG Cyber, said Colonial was lucky its attacker was at least ostensibly motivated only by profit, not geopolitics. State-backed hackers bent on more serious destruction use the same intrusion methods as ransomware gangs.

鈥淔or companies vulnerable to ransomware, it鈥檚 a bad sign because they are probably more vulnerable to more serious attacks,鈥� he said. Russian cyberwarriors, for example, crippled the electrical grid in Ukraine during the winters of 2015 and 2016.

have become a death-by-a-thousand-cuts phenomenon in the past year, with attacks forcing delays in cancer treatment聽interrupting schooling and paralyzing police and city governments.

Tulsa, Oklahoma, this week became the 32nd state or local government in the U.S. to come under ransomware attack, said Brett Callow, a threat analyst with the cybersecurity firm Emsisoft.

Average ransoms paid in the U.S. jumped nearly threefold to more than $310,000 last year. The average downtime for victims of ransomware attacks is 21 days, according to the firm Coveware, which helps victims respond.

David Kennedy, founder and senior principal security consultant at TrustedSec, said that once a ransomware attack is discovered, companies have little recourse but to completely rebuild their infrastructure, or pay the ransom.

鈥淩ansomware is absolutely out of control and one of the biggest threats we face as a nation,鈥� Mr. Kennedy said. 鈥淭he problem we face is most companies are grossly underprepared to face these threats.鈥�

Colonial transports gasoline, diesel, jet fuel and home heating oil from refineries on the Gulf Coast through pipelines running from Texas to New Jersey. Its pipeline system spans more than 5,500 miles, transporting more than 100 million gallons a day.

Debnil Chowdhury at the research firm IHSMarkit said that if the outage stretches to one to three weeks, gas prices could begin to rise.

鈥淚 wouldn鈥檛 be surprised, if this ends up being an outage of that magnitude, if we see 15- to 20-cent rise in gas prices over next week or two,鈥� he said.

The Justice Department has a new聽

While the U.S. has not suffered any serious cyberattacks on its critical infrastructure, officials say Russian hackers in particular are known to have infiltrated some crucial sectors, positioning themselves to do damage if armed conflict were to break out. While there is no evidence聽聽U.S. officials believe President Vladimir Putin savors the mayhem it wreaks in adversaries鈥� economies.

Iranian hackers have also been aggressive in trying to gain access to utilities, factories, and oil and gas facilities. In one case in 2013, they聽

This story was reported by The Associated Press. Bajak reported from Boston. AP Writers Alan Suderman in Richmond, Virginia, and Martin Crutsinger and Michael Balsamo in Washington contributed to this report.