This record tracks a ransomware attack claimed by the
AiLock group against
Nihon Kotsu 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 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.
-41days
t1 · Published
t2 · Disclosed
Business Category
Transportation / Travel / Logistics
Disclosed / Notified
Jun 04, 2026
Attack Summary
Nihon Kotsu Co., Ltd. is the largest taxi and limousine operator in Japan. For the fiscal year ending May 2025, the company reported an annual consolidated revenue of ¥103.445 billion, with group and partner company sales reaching ¥155.457 billion.
Leak Screenshots
SAMPLE
Proof-of-breach screenshots the operator posted from the stolen data. Previews are
redacted and locked — the originals are available on HaveIBeenRansom.
Dark Web Exposure
Findings for nihon-kotsu.co.jp
— indexed by HaveIBeenRansom.
2
found in Infostealer logs
20
found in Traditional breaches
2
found in Ransomware leaks
2844Breaches_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
LOGITECH.COM
clop · ransomware
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
AntiPublic_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 2 more leak sources locked
Leak volumes are locked
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Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.