On Tuesday 6th of June 2023, Eisai, a Tokyo-based pharmaceutical company Eisai disclosed it suffered a ransomware incident over the weekend that impacted its operations following the threat actors encrypting some of its servers. In response to the attack, Eisai has taken many of its IT systems offline to contain the damage and prevent the spread of the locker to further portions of the breached corporate network.
Eisai stated in a released notice that they had immediately implemented their incident response plan and had launched an investigation with the aid of their cybersecurity partners. Eisai also explained that several of its systems, both inside and outside Japan, including logistics systems, will remain out of service until investigations are concluded. Eisai stated that the possibility of data leakage is under investigation; hence it remains a potential risk.
No ransomware group has claimed responsibility for the incident yet.