Eisai Co., Ltd
atomsiloThis record tracks a ransomware attack claimed by the atomsilo group against Eisai Co., Ltd. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
[AI generated] Eisai Co., Ltd. is a Japanese multinational pharmaceutical company headquartered in Tokyo. Established in 1941, it's one of the leading firms in the field of neurology and oncology. Eisai produces several drugs used globally such as Aricept for Alzheimer's disease and Halaven for breast cancer. Aside from drug creation, Eisai also engages in global health initiatives.
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.