Japan’s Keio Railway Hit by Ransomware Attack, Disrupting Business Systems
Keio Corporation, a major private railway operator in Japan, has confirmed that its network was hit by a ransomware attack over the weekend. The cyberattack disrupted some of the company’s business systems and forced it to shut down its network to prevent further damage. Keio is one of Japan’s largest railway operators, with 85 kilometers of track, 69 stations, and a separate hospitality business consisting of 25 hotels.
The incident appears to have affected only the hospitality side of Keio’s business, not train operations. The company has confirmed that its payment systems were disrupted, which may lead to delays in customer-facing services. Local media outlets have reported that the cyberattack also affected Keio’s payment systems, further indicating the severity of the attack.
Ransomware attacks typically involve a type of malware designed to encrypt a victim’s data and demand a ransom in exchange for the decryption key. In this case, it is unclear whether the attackers are seeking financial compensation or have other motives. However, the fact that Keio was forced to shut down its network suggests that the attackers may be seeking to disrupt business operations rather than simply extorting money.
Keio’s confirmation of the attack comes as Tokyo Metro, another major Japanese railway operator, disclosed a separate cyber incident over the weekend. In this case, attackers gained unauthorized access to 59,000 member email addresses. While it is unclear whether these two incidents are related or part of a coordinated campaign by the same threat actor, they highlight the growing concern for cybersecurity in Japan’s transportation sector.
The Tokyo Metro breach was contained quickly, with the company identifying and closing the security weakness used by the attackers within days. However, the Keio incident has raised questions about the effectiveness of its cybersecurity measures and whether it could have prevented or mitigated the attack. As both companies are major players in Japan’s transportation industry, their experiences serve as a reminder to organizations across various sectors that cybersecurity threats can strike at any time.
In light of these incidents, organizations must prioritize cybersecurity and take proactive steps to protect themselves against ransomware attacks. This includes regularly updating software, implementing robust backup systems, and educating employees on the importance of cybersecurity best practices. By doing so, companies can minimize the impact of a potential attack and ensure business continuity in the face of a cyber incident.
Source: Bleeping Computer — 2026-09-28