Japan is grappling with an unprecedented surge in cyberattacks, with the National Police Agency recording 123 ransomware incidents in the first half of 2026—the highest number for any six-month period since data collection began in 2020. This wave of digital threats has impacted a wide spectrum of the nation, including local government bodies, manufacturing firms, hospitals, schools, and major corporations.
National Police Agency records 123 ransomware incidents
A Rising Tide of Cyber Threats
The scale of the disruption has prompted government concern, with Minister of Digital Transformation Toshiharu Furukawa noting that the attacks are reaching across all sectors. Reports indicate that unauthorized access incidents have become increasingly common, with hackers obtaining login credentials to infiltrate internal networks, steal data, or encrypt systems for ransom.
Data from the National Police Agency shows that in the first half of the year, 60% of these incidents resulted in damages exceeding 10 million yen. In more than half of the recorded cases, system and data recovery took over a month, and nine instances led to a total suspension of business operations. Additionally, the agency detected approximately 13,700 suspicious access attempts daily during that period, a nearly 50% increase from the previous year, as attackers scanned for vulnerabilities in computer systems.
Microsoft reports Japan ranked eighth globally
The Role of Artificial Intelligence
While ransomware has long been a challenge, experts suggest that artificial intelligence is making these attacks easier and more frequent. Automated systems now allow hackers to scan for global vulnerabilities around the clock. While the Japanese language previously served as a barrier to international cybercriminals, A.I.-generated translations have enabled more persuasive phishing campaigns.
According to a report from Microsoft, Japan was ranked eighth globally for the proportion of organizations affected by cyber threats between January and June 2026. Experts point out that Japan’s status as the world’s fourth-largest economy, combined with its extensive global supply chain technology, makes it an attractive target. Analysts also suggest that the country’s cybersecurity infrastructure has struggled to keep pace with its early adoption of technology, leaving many organizations vulnerable due to unpatched systems and outdated software.
Yusuke Nakanishi states measures include neutralizing access
Government Response
In response to the escalating threat, the Japanese government has implemented new measures under a cybersecurity law that took effect on October 1, 2026. Deputy Prime Minister Yusuke Nakanishi stated that these measures include "neutralizing access," a proactive strategy that allows the government to analyze communications and target attackers to prevent them from utilizing their tools.
Ko Fujii notes the current wave
Despite these efforts, the threat remains persistent. Ko Fujii, founder of the public affairs agency Makaira, noted that the current wave appears to be driven by the high return on investment for hackers targeting unpatched infrastructure rather than a coordinated geopolitical campaign. As organizations continue to face challenges in replacing legacy systems and implementing modern security controls, officials are urging businesses to maintain heightened vigilance.
