株式会社 丸山製作所

Maruyama Manufacturing Co, also known as 株式会社 丸山製作所, is a manufacturing company headquartered in Japan. The organization’s name indicates its involvement in manufacturing activities, although the specific products or industries it serves are not detailed in the available sources. As a Japanese‑based firm, it likely conducts operations within the domestic market and may also engage with international partners. The company maintains an official email domain of @maruyama.co.jp, which it references in communications. No further details about its size, revenue, or market share are provided in the material.

On February 8, 2022, a computer belonging to a Maruyama Manufacturing employee was infected with Emotet malware, leading to the exfiltration of email data that included internal and external contact names, addresses, and message subjects. Attackers used the stolen information to send fraudulent emails that impersonated company personnel and contained malware‑laden encrypted ZIP attachments. The company confirmed the data breach, warned recipients to verify that sender addresses matched its official @maruyama.co.jp domain, and launched an investigation to prevent secondary damage. In response to the incident, Maruyama Manufacturing stated its intention to strengthen cybersecurity measures to mitigate future risks. The event is documented in a PDF notice published by the company on February 9, 2022.