This record tracks a ransomware attack claimed by the
qilin group against
Keio Corporation. 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 GAP
Window 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.
0days open
t1 · Published
t2 · Pending
Business Category
Services
Indexed by Breach House
October 15, 2026
Leak Status
pending
checked 2026-10-15
Disclosed / Notified
Not disclosed yet
Attack Summary
Keio Corporation is a prominent corporation headquartered in Japan operating within the Services sector, delivering a range of business and operational solutions to clients across multiple industries. As part of a threat-intelligence index, Keio Corporation is specifically cataloged as a ransomware victim associated with the threat actor known as qilin. This listing type indicates that the entity was impacted by a ransomware campaign tied to this actor, contributing valuable intelligence for defenders assessing risks within the Japanese Services domain. The entry reflects documented threat activity without disclosing unverified details regarding data exfiltration, ransom demands, or operational impact. Understanding such associations helps cybersecurity professionals monitor evolving attack patterns and strengthen protective measures for similar organizations.
Leak Screenshots
28 CAPTURED
Captured directly from the operator's leak site by our collector, last checked 2026-10-15. Verdict evidence: [M1] Time till publication: 111h:29m
Proof files published by the operator —
27 image(s) harvested from this entry.
Content is locked; type and dimensions shown.
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Dark Web Exposure
Cross-referenced against HaveIBeenRansom's dark-web index of ransomware leaks, breaches & infostealer logs.
0
found in Infostealer logs
0
found in Traditional breaches
0
found in Ransomware leaks
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Full exposure is locked
See every breached email, the internal-vs-external split and each leak source behind this victim.
Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house only records what the operators themselves publish in the
open. We take screenshots of their public pages and keep the proof
material they post there, so that a listing can be verified and its status
tracked over time. We do not purchase data, we do not solicit or encourage
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