Eisai Pharma Takes Systems Offline After Ransomware Attack

June 27, 2023


Japanese pharma group Eisai Co., Ltd. says it is battling a ransomware attack that was launched on June 3. This resulted in some of its servers becoming encrypted. The attack affected servers both within and outside Japan, and resulted in some of the group’s IT functions, including logistics systems, being taken off line.

For now, it says the corporate websites and email services remain operational, and there’s no clear indication yet whether sensitive data has been leaked. "Eisai Group is working closely with external experts and law enforcement in an effort to protect its systems and to make a successful recovery."

“Any potential impact of this incident on the consolidated earnings forecast of this fiscal year is currently under careful examination,” it said.

At the time of writing, it’s not clear if the attack is linked to the other recent data hacks of Cl0p ransomware gang.

Incident Date

June 3, 2023



Estimated Cost

unknown at this time

Type of Malware

No Malware identified

Threat Source

No threat source identified