The IT and internet services giant said on its blog that it believes the attacker has published information allegedly linked to customers and its business. However, the contents are still being verified and the full extent of the incident remains unclear.
GMO Internet has since advised customers to reset their passwords, amid receiving reports of “unauthorized operations” performed on customer trading accounts. The company said 27,000 servers may be affected by the breach.
A spokesperson for GMO Internet did not respond to TechCrunch’s request for comment.
The incident comes about a week after the Japanese firm’s cybersecurity unit separately reported finding evidence that a Chinese AI-enabled penetration testing tool called Artex had been used in hacks targeting companies across Japan. However, the company said it has not publicly established a connection between Artex and the breach of Onamae.
