As the damage from cyberattacks expanded in Japan, cybersecurity-related stocks were temporarily bought in the market. Specifically, a ransomware attack targeting IDC Frontier's cloud service was said to have affected approximately 500 companies and organizations.
As cyberattack damage continued to mount in Japan, a ransomware attack on IDC Frontier's cloud service in early October 2026 was reported to have affected approximately 500 companies and organizations, including Nissui and local governments. This prompted broader buying of cybersecurity-related stocks in the market.
As for the market reaction, Trend Micro was reported to have risen to around ¥7,430 on 8 October, reaching its highest level in approximately 10 months. Cyber Security Cloud,Inc. rose from a closing price of ¥1,973 on 2 October to an intraday high of ¥4,400 on the 13th, more than doubling in a short period. This has led to comments that the theme appeal of related stocks has strengthened.