Yes24 Suffers Ransomware Attack, Disrupting South Korean Entertainment Industry
South Korea's major online ticketing and book retailing platform, Yes24, was hit by a ransomware attack on June 9, 2025.
Key points
- Ransomware attack occurred on June 9, 2025.
- Caused a complete shutdown of Yes24's website and app for days.
- Disrupted online bookings for concerts, e-book access, and community forums.
Connected intelligence
Signal brief
Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.
Organization
- Published
- Jun 9, 2025
- Updated
- Jun 26, 2026
- Confidence
- Medium
- Evidence
- 1 source
Structured assessment
Signal analysis
This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
Watch ransomware, endpoint compromise and business interruption exposure.
Business impact
- Impact area
- Confidentiality, Availability
- Likely asset
- User or customer data
Mentioned entities
Quick context
Questions about this signal
What happened in this signal?
South Korea's major online ticketing and book retailing platform, Yes24, was hit by a ransomware attack on June 9, 2025. The attack caused a complete shutdown of its website and app for several days, disrupting online bookings for concerts, e-book access, and community forums. The company apologized for the inconvenience and initiated an investigation with relevant government agencies, including the Personal Information Protection Commission (PIPC). While Yes24 stated it had not yet confirmed external leakage of personal information, it reported suspicious activity involving unauthorized access to customer data.
When was this signal reported?
Shadow Tier lists Jun 9, 2025 as the signal date.
Which organization is connected to this signal?
Yes24 is the organization connected to this public signal.
Explore Yes24Which attack pattern is relevant?
This signal is connected to current ransomware incidents based on its reported incident context.
Explore current ransomware incidentsWhich impact area is relevant?
This signal is connected to data exposure and breach intelligence based on its reported consequences.
Explore data exposure and breach intelligenceRelated signals
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Healthcare AI Company Xsolis Suffers Data Breach Impacting 1.4 Million Individuals
Healthcare technology company Xsolis, Inc. has disclosed a data breach affecting nearly 1.4 million individuals. Tennessee-based Xsolis provides utilization management and revenue cycle solutions for hospitals, health systems, and payers. The company published a data security notice in early June, revealing that unauthorized activity was detected on its systems on January 22. The intrusion resulted from a targeted phishing attack carried out two days earlier. According to Xsolis, the hackers gained access to files storing personal and protected health information received by the company from its clients, including names, dates of birth, addresses, SSNs, health insurance information, and medical treatment information. While the data breach was disclosed two weeks ago, the US Department of Health and Human Services (HHS) has now disclosed the number of affected individuals. The Xsolis cybersecurity incident was added to the HHS data breach tracker on Monday, with the number of affected individuals listed as 1,396,519. Advertisement. Scroll to continue reading. No known ransomware group appears to have taken credit for the attack on the healthcare tech company. SecurityWeek has asked Xsolis whether it was targeted in an extortion attempt and, if so, whether a ransom has been paid. The company’s disclosure indicates that it’s “not aware of any actual or attempted misuse of information because of this incident”. It’s not uncommon for healthcare-related data breaches to affect millions of people. One recent example is the incident involving the dental benefits administrator DentaQuest , in which hackers stole information from 2.6 million accounts. Related : Millions Impacted Across Several US Healthcare Data Breaches Related : 266,000 Affected by Data Breach at Radiology Associates of Richmond Related : Oncology Institute Discloses Data Breach Written By Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. 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CodeSecCon bridges the gap between dev and security. Discover best practices for secure coding, innovative risk-reduction tools, and safe AI integration to cultivate a true DevSecOps culture. Safely secure your apps! Xsolis breach exposes personal and health data of 1.4 million people Healthcare technology company Xsolis has disclosed a data breach impacting nearly 1.4 million individuals following a phishing attack. The Tennessee-based firm, which provides utilization management and revenue cycle solutions for healthcare providers, became aware of unauthorized access on January 22, 2026, after a phishing attack two days prior. The breach exposed personal and protected health information received from Xsolis’s hospital and payer clients, as reported by Security Affairs. The security incident, which occurred on January 20, 2026, allowed an unauthorized actor to acquire files containing sensitive information. This data may include names, addresses, dates of birth, Social Security numbers, health insurance details, and medical treatment information. Xsolis has launched an investigation, reported the incident to law enforcement, and is implementing enhanced security measures. Affected individuals are being notified by mail and offered free credit monitoring and identity protection services, along with access to a toll-free call center. The U.S. Department of Health and Human Services reported that 1,396,519 individuals were affected. No ransomware group has claimed responsibility for the attack at this time.
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Latvijas Valsts Mezi (LVM) Suffers Cybersecurity Breach
Cybersecurity breach reveals vulnerability of Latvia's strategic infrastructure: minister RIGA, June 26 (Xinhua) -- A recent incident in which hackers managed to access IT systems of Latvia's state-owned company Latvijas Valsts Mezi (LVM) revealed the relative vulnerability of the country's strategic infrastructure, Smart Administration and Regional Development Minister Edgars Tavars said Friday. The cybersecurity breach in LVM has caused particular concerns because the company has been entrusted with developing an electoral IT platform for Latvia's parliamentary elections, which are scheduled to take place this fall. In an interview with the TV3 channel on Friday, Tavars called on all state institutions to identify cybersecurity flaws in their own systems and learn a lession from the LVM incident. The minister believes, though, that in general, Latvian IT specialists are good enough to prevent similar incidents from repeating in the future. Tavars said that the electronic voter register, on which LVM has been working, was completed before the incident and was not at risk. In general, "we are definitely not ringing alarm bells about the elections," the minister said. LVM discovered the cybersecurity breach of its IT systems last weekend. In response, the company took all its external IT systems offline and also shut down some internal communication systems. A foreign ransomware group, which has carried out similar attacks against companies and government agencies in other countries, has claimed responsibility on the cyberattack on LVM. Cyberattack on Latvian State Forests detected LVM is one of three companies developing this year’s Saeima election system . However, the company noted that the development of the election system was kept separate and was not affected. Security measures will be reviewed as a precaution. The cyberattack occurred on Monday, June 22. According to the company, since the incident began, the external information technology (IT) systems maintained by LVM, including “LVM GEO,” the mapping service system, and the hunting app “Mednis”, have been shut down and are unavailable for security reasons. Several of LVM’s internal systems, which facilitate the company’s exchange of information with service providers and clients, have also been taken offline. LVM spokesperson Tomass Kotovičs stated that the threat has been eliminated, but it will take time to restore the systems to operation. Baiba Kaškina, head of “Cert.lv,” explained that the attack was thwarted immediately. According to her, there is no reason to believe that it was specifically targeted at Latvia. “Cert.lv” is inclined to believe that this was a commercially motivated attack aimed at demanding a ransom and demonstrating the attackers’ capabilities. The State Police Cybercrime Combating Directorate, based on publicly available information, has launched an internal investigation on its own initiative to clarify the circumstances of the incident and identify the possible perpetrator, according to the LETA news agency. Select text and press Ctrl+Enter to send a suggested correction to the editor Select text and press Report a mistake to send a suggested correction to the editor
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Singapore Land Authority Data Breach Exposes 70,000 Records via IBM Testing Environment
Singapore Land Authority data breach exposes 70,000 records after IBM testing environment compromised SINGAPORE, July 3 — Personal data belonging to about 70,000 individuals has been compromised in a cybersecurity incident involving the Singapore Land Authority (SLA) and a cloud environment managed by IBM. SLA said the breach stemmed from unauthorised access to a dataset created for vendor development and systems integration testing, CNA reported. IBM oversees the testing environment for the Singapore Titles Automated Registration System (STARS) and eLodgment System (ELS), which are used to submit property transfer and caveat documents. Preliminary checks showed the dataset, first created in 1998 and updated periodically, was intended to contain only mock and anonymised records. It was later discovered to include real information such as names, NRIC numbers and past property addresses of around 70,000 people. SLA stressed that the affected environment is separate from its live operational systems, adding that property ownership and lodgment records in STARS and ELS remain secure. IBM has revoked access to the compromised system to prevent further unauthorised entry. As a precaution, SLA has begun notifying affected individuals and advising them on assistance measures. The authority said it is working with IBM, the Government Technology Agency of Singapore and the Cyber Security Agency of Singapore to investigate the incident and implement remedial steps. According to CNA, a police report has been lodged and the Personal Data Protection Commission has been notified. SLA has not yet disclosed when the breach occurred or how many affected individuals have been contacted. Singapore’s first dedicated hospital for native wildlife opens at Mandai Singapore bookie aged 69 jailed for illegal betting on Hong Kong horse races Fatal dispute between Singapore Redhill flat neighbours leads to murder charge PDRM prepares security operations for Negeri Sembilan state election Defence weighs AGC appeal for driver in fatal Klang crash Amirudin: Pakatan banks on micro-campaign strategy to win over Negeri Sembilan voters ÑеÑгей ÑаÑанÑÑа - stock.adobe.com The Singapore Land Authority (SLA) has revealed that the personal information of about 70,000 individuals was exposed following unauthorised access to a cloud environment managed by IBM, its technology supplier. IBM was appointed to support and maintain SLA’s Singapore Titles Automated Registration System (Stars) and eLodgment System (ELS), which underpin property title registration and the lodgement of property documents in the city-state. As part of that work, the supplier managed the development and systems integration testing environment for the two systems. In a statement on 3 July 2026, SLA said it had been informed by IBM of the incident, with preliminary investigations indicating that a dataset created solely for development and testing purposes had been accessed without authorisation. The dataset, created in 1998 and updated periodically over the years, was meant to contain only mock and anonymised testing data based on property ownership and lodgement records. However, SLA said it has since uncovered that the dataset also contained the names, National Registration Identity Card (NRIC) numbers and property addresses of the affected individuals at the time. “This information should have been anonymised but was not,” the agency said, adding that investigations are ongoing to determine how this occurred. SLA noted that the affected environment is “distinct and separate” from its operational systems, with no connection to, or compromise of, the live systems that run Stars, ELS or any other SLA systems. Property ownership and lodgement records remain secure and unaffected, it added. IBM has revoked access associated with the affected environment to prevent further unauthorised access, while SLA has identified the individuals whose information was contained in the dataset, and has begun notifying them and advising them on how to seek further information and assistance. Singapore mobilised over 100 cyber defenders to neutralise a sophisticated APT actor which infiltrated Singtel, StarHub, M1 and Simba networks in the country’s largest coordinated cyber incident response to date . Japan’s Nikkei has confirmed a major data breach that potentially exposed the personal information of more than 17,000 employees and business partners after hackers infiltrated its internal Slack messaging platform. Australian privacy commissioner warns that the human factor is a growing threat as notifications caused by staff mistakes rose significantly even as total breaches declined 10% from a record high. Philippine bank BDO is shoring up its cyber security capabilities to protect its data and systems as it moves more services to the cloud and expands its physical presence into remote areas of the archipelago. The agency is working with IBM, the Government Technology Agency and the Cyber Security Agency of Singapore (CSA) to establish the full facts and ensure remedial measures are taken. It has also lodged a police report and notified the Personal Data Protection Commission, and urged the public to remain vigilant against phishing emails, websites, text messages and phone calls from parties claiming to represent government agencies or other organisations. “We apologise for the concern and inconvenience this incident may cause,” the SLA said. The incident underscores the long-standing risk of real personal data finding its way into development and test environments , which are typically less closely guarded than production systems – a risk that is compounded when those environments are operated by third parties. It is also the latest in a series of supply chain security incidents in Singapore in recent years. In April 2025, Toppan Next Tech, a printing supplier for DBS Bank and the Singapore branch of Bank of China, was hit by a ransomware attack that saw customer data stolen by the threat actor . Some 8,200 DBS customers – mostly holders of DBS Vickers trading accounts and Cashline loans – and around 3,000 Bank of China customers were potentially affected. A year earlier, in August 2024, a hacker who gained unauthorised access to Mobile Guardian , a mobile device management platform then deployed across Singapore’s schools, remotely wiped the iPads and Chromebooks of about 13,000 students from 26 secondary schools. The Ministry of Education subsequently removed the software from all student devices and terminated its contract with the supplier.
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DyStar Group Hit by Settra Ransomware Attack, 1.3 TB of Internal Data Exfiltrated
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