Nihon Kotsu Co., Ltd.
AiLock listed this organization on its leak site on Jul 15, 2026.
- Listing date
- Jul 15, 2026
- Attack date
- Jul 15, 2026
Listing text
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.
About the group
AiLock posted its first listing on Mar 3, 2026 and has listed 51 organizations to date.
AiLock is a ransomware operation that emerged in early 2025, marketing itself as AI-assisted ransomware using a hybrid ChaCha20/NTRUEncrypt encryption scheme and double-extortion tactics, actively recruiting affiliates and threatening regulatory reporting if ransoms are unpaid.
Learning center
What does this listing mean?
Ransomware groups move data out of the organization before encrypting systems and threaten to publish it if the ransom is not paid. This method is called double extortion.
The listing shows that the group claims to have targeted the organization. Whether the data was published is shown by the later status of the listing.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
Is your organization mentioned?
Search with your domain to check whether your organization appears in ransomware listings, leaked records, forums and Telegram channels.
Search your domainIntelligence 360
Customer intelligence on top of Infostealer Detection: leaked accounts of end users who sign in to your site.