Korea puts 28 police officers and its science ministry on a breach at seven financial firms
President Lee Jae Myung ordered resources onto a breach of customer data at seven Korean financial firms, citing possible AI use in some attacks. What the firms pay will turn on a network law amended five days earlier and on which ministry runs the case.
The Investor · Invest desk
What happened
- Hana Bank, KB Kookmin Bank and Shinhan Bank are among the seven firms whose customer information was exposed.
- At a parliamentary audit, People Power Party lawmakers said the government's response fell short because agencies worked in silos.
- The amended network act lets authorities open on-site investigations as soon as they detect signs of hacking, without waiting for a company report.
Why it matters
- Who's exposed exposure The seven firms no longer control when inspectors arrive, since authorities can now act on signs of hacking before any company files a report.
- What it costs cost Bae's pledge of stronger punitive and economic sanctions points the bill at the breached firms, sized under an act he says has yet to show results.
- What it sets up precedent The breach landed five days into the amended act, so how hard the ministry uses its on-site power here will set expectations for the next financial hack.
Next story · Security · Oct 6
South Korea suspects AI agents in bank breaches that leaked data on at least 25,000 Shinhan customersConfirmed17 publishers
Lee's own words set the strength of the AI claim. "In some hacking cases, details have emerged of the possible use of artificial intelligence (AI), causing the people to feel great concern and anxiety," he told the Cabinet [3]. The qualifiers are his: some cases, possible use. The reports do not include a customer count, the names of the other four firms, or a description of what AI did in any of the attacks [2][16].
According to Yonhap, Lee went on to say AI-driven methods are increasing the scope of damage to previously unseen levels [4]. He asked for faster development and adoption of AI tools built for cyber security [7]. "It is difficult to respond to evolving cyber threats by handling accidents after they happen," he said. "We must have the security capabilities to detect and block attacks in advance." [6] The one spending figure on the record belongs to the science ministry, whose information protection budget is up 44% from a year earlier, according to minister Bae Kyung-hoon [9].
For the seven firms, the more direct cost runs through a statute. Police are examining violations of the information and communications network law with a 28-member team [5]. A revised version of that act took effect on October 1, five days before the Cabinet meeting [10][17]. It lets authorities open on-site investigations as soon as they detect signs of hacking, even without a report from the company [10]. Bae said the government "will also strengthen punitive and economic sanctions" [11]. He also said: "The revised Information and Communications Network Act took effect only recently, so its effectiveness is not yet immediately visible, but clear results will emerge going forward." [12]
The opposition's complaint at the same day's audit was about who holds the case. Rep. Choi Hyung-doo of the People Power Party said the hacking "is not a matter for the Financial Services Commission or the Financial Supervisory Service but, under the government's structure, a matter for the Ministry of Science and ICT." [13] Rep. Seo Cheon-ho, of the same party, noted that response systems are divided by agency and that there is no government-wide task force [14]. Bae accepted the role. "The Ministry of Science and ICT will take the lead in managing and responding to breach incidents and will step up efforts to pass information on to companies and across ministries," he said [15]. So the government has put one ministry in charge and 28 officers on the probe [5][15], and by Seo's account it has not built a cross-government unit [14].
The outcomes split on what the police find. If AI turns out to have played a minor part, this becomes an ordinary enforcement case under the amended act, and the open question is how large the sanctions are. Should AI-assisted methods run through most of the seven breaches, the money Lee described goes to state-built defenses, and the firms look more like targets than offenders. A third path is a remit fight between ministries that leaves the new on-site power unused in its first weeks [17].
I think the first money to move will be the firms', under an act whose own minister says sanctions will get tougher [11]. The counter-case has weight: a president who calls the attacks AI-driven [4] has political reasons to treat the banks as victims of a new kind of threat, and heavy penalties would undercut that framing. This view is wrong if the police attribute the breaches to AI-assisted methods that ordinary controls could not have caught, and no sanctions follow under the amended act.
What to watch
- Police findings on whether AI tools were actually used, and in how many of the seven breaches.
- Whether the science ministry uses its new on-site investigation power at any of the seven firms, and what sanctions follow under the amended act.
- Disclosure of the four unnamed firms and the number of customers whose information was exposed.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence58
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- [1]
President Lee Jae Myung instructed the government on Tuesday, Oct. 6, at a Cabinet meeting to dedicate personnel and resources to minimizing damage from a recent series of hacking attacks at financial firms.
- [2]
The attacks exposed customer information at seven companies, including Hana Bank, KB Kookmin Bank and Shinhan Bank.
- [3]
"In some hacking cases, details have emerged of the possible use of artificial intelligence (AI), causing the people to feel great concern and anxiety," Lee said.
- [4]
Lee said AI-driven hacking methods are increasing the scope of damage to previously unseen levels.
- [5]
Police said the same day that an investigation has been launched into the cyber attacks, with a 28-member team looking into charges of violations of the information and communications network law.
- [6]
"It is difficult to respond to evolving cyber threats by handling accidents after they happen," he said. "We must have the security capabilities to detect and block attacks in advance."
- [7]
Lee called for accelerated efforts to develop and adopt AI tools tailored for cyber security.
- [8]
Opposition lawmakers criticized the government's handling of the hacking attacks on financial firms during a parliamentary audit of the Ministry of Science and ICT on the 6th, saying the response had been inadequate because agencies worked in silos.
- [9]
Science minister Bae Kyung-hoon said the ministry is raising its information protection budget by 44% from a year earlier.
- [10]
Under the amended Information and Communications Network Act, which took effect on the 1st of this month (October), authorities can conduct on-site investigations immediately when signs of hacking are detected, even without a separate report from the company.
- [11]
Bae said the government "will also strengthen punitive and economic sanctions."
- [12]
"The revised Information and Communications Network Act took effect only recently, so its effectiveness is not yet immediately visible, but clear results will emerge going forward," Bae said.
- [13]
Rep. Choi Hyung-doo of the People Power Party said the hacking of financial firms "is not a matter for the Financial Services Commission or the Financial Supervisory Service but, under the government's structure, a matter for the Ministry of Science and ICT."
- [14]
Rep. Seo Cheon-ho of the People Power Party said the Ministry of Science and ICT must accept responsibility as lead agency for hacking response, noting that response systems are divided by agency and there is no government-wide task force.
- [15]
"The Ministry of Science and ICT will take the lead in managing and responding to breach incidents and will step up efforts to pass information on to companies and across ministries," Bae said.
- [16]
Four of the seven affected firms were not named in the reports.
- [17]
The amended network act had been in force five days when Lee issued his order and police opened the probe.
Sources
2 independent publishers whose own reporting we read for this story.
- en.sedaily.comLawmakers Fault Science Ministry Over Financial Hacking Response
1 article · October 5, 2026
- en.yna.co.krLee orders dedication of personnel, resources to handling hacking attacks
4 articles · October 6, 2026
Topics and entities
Topics
- South Korea cyber policy
- Financial Sector Cybersecurity
- AI-Enabled Cyberattacks
- Customer data breaches
Entities
- People Power Party
- Financial Supervisory Service
- NH NongHyup Bank
- Shinhan Bank
- Woori Bank
- National Police Agency
- Hana Bank
- KB Kookmin Bank
- Information and Communications Network Act
- Ministry of Science and ICT
- Lee Jae-myung