China’s ICBC, the world’s biggest bank, hit by cyberattack that reportedly disrupted

In Asia

A pedestrian walks pass a branch of Industrial & Commercial Bank of China (ICBC) in Fuzhou, Fujian province of China.

VCG | Getty Images

The U.S. financial services division of Chinese bank ICBC was hit with a cyberattack that reportedly disrupted the trading of Treasurys.

Industrial and Commercial Bank of China, the world’s largest lender by assets, said Thursday that its financial services arm, called ICBC Financial Services, experienced a ransomware attack “that resulted in disruption to certain” systems.

Immediately after discovering the hack, ICBC “isolated impacted systems to contain the incident,” the bank said.

Ransomware is a type of cyberattack. It involves hackers taking control of systems or information and only letting them go once the victim has paid a ransom. It’s a type of attack that has seen an explosion in popularity among bad actors in recent years.

ICBC did not reveal who was behind the attack but said it has been “conducting a thorough investigation and is progressing its recovery efforts with the support of its professional team of information security experts.”

The Chinese bank also said it is working with law enforcement.

ICBC said it “successfully cleared” U.S. Treasury trades executed Wednesday and repo financing trades done on Thursday. A repo is a repurchase agreement, a type of short-term borrowing for dealers in government bonds.

However, multiple news outlets reported there was disruption to U.S. Treasury trades. The Financial Times, citing traders and banks, said Friday that the ransomware attack prevented the ICBC division from settling Treasury trades on behalf of other market participants.

The U.S. Treasury Department told CNBC: “We are aware of the cybersecurity issue and are in regular contact with key financial sector participants, in addition to federal regulators. We continue to monitor the situation.”

ICBC said the email and business systems of its U.S. financial services arm operate independently of ICBC’s China operations. The systems of its head office, the ICBC New York branch, and other domestic and overseas affiliated institutions were not affected by the cyberattack, ICBC said.

What did the Chinese government say?

Wang Wenbin, spokesperson for China’s Ministry of Foreign Affairs, said Friday that ICBC is striving to minimize the impact and losses after the attack, according to a Reuters report.

Speaking at a regular news conference, Wang said ICBC has paid close attention to the matter and has handled the emergency response and supervision well, according to Reuters.

What do we know about the ransomware attack?

Nobody has claimed responsibility for the attack yet and ICBC has not said who might be behind the attack.

In the cybersecurity world, finding out who is behind a cyberattack is often very difficult due to the techniques hackers use to mask their locations and identities.

But there are clues about what kind of software was used to carry out the attack.

Marcus Murray, founder of Swedish cybersecurity firm Truesec, said the ransomware used is called LockBit 3.0. Murray said this information has come from sources with relations to Truesec, but was unable to reveal who those sources are due to confidentiality reasons. The Financial Times reported, citing two sources, that LockBit 3.0 was the software behind the attack too. CNBC was unable to independently verify the information.

This kind of ransomware can make its way into an organization in many ways. For example, by someone clicking on a malicious link in an email. Once in, its aim is to extract sensitive information about a company.

VMWare cybersecurity team said in a blog last year that LockBit 3.0 is a “challenge for security researchers because each instance of the malware requires a unique password to run without which analysis is extremely difficult or impossible.” The researchers added that the ransomware is “heavily protected” against analysis.

The U.S. government’s Cybersecurity and Infrastructure Security Agency calls LockBit 3.0 “more modular and evasive,” making it harder to detect.

— CNBC’s Steve Kopack contributed to this article.

Read More: China’s ICBC, the world’s biggest bank, hit by cyberattack that reportedly disrupted

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