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TOC Building (株式会社テーオーシー)

listed as www.toc.co.jp · Claimed by Lynx · listed 7 months ago

7m
Age
since listed · data leaked

Status timeline

  1. ListedDec 6, 2025
  2. Data leakeddate unknown

At a glance

Group
Lynx
Status
Data leaked
Country
Japan
Sector
Transportation/Logistics
Listed on leak site
Dec 6, 2025

About the victim

AI dossier — public-source company profile

TOC Building (operated by Toc Co., Ltd. / 株式会社テーオーシー) is a large commercial facility located in Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan. The building hosts a wide variety of retail tenants including clothing stores, kitchenware shops, cafes, electronics retailers, and food outlets, as well as event hall facilities. It operates a free shuttle bus service and targets a broad consumer demographic including families and individuals seeking shopping and entertainment.

Industry
Commercial Real Estate & Retail Complex Management
Address
東京都品川区西五反田七丁目22番17号 (7-22-17 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan)

Attack summary

Severity: high — The company itself publicly confirmed an unauthorised network access incident on December 4, 2025, and Lynx has marked the disclosure status as 'data_published', indicating confirmed exfiltration and publication of data. The scale of potential exposure from a large multi-tenant commercial facility with customer and business data elevates this beyond medium, though the absence of specific regulated data categories (e.g., medical, financial at scale) prevents a critical classification.

The Lynx ransomware group claims responsibility for an unauthorised network intrusion against the operating company of TOC Building, confirmed by the company's own public notice dated December 4, 2025. The group has published data; however, no specific data categories, volume, or ransom amount have been stated in the leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Corporate network data
  • Tenant information
  • Customer data (inferred from retail/facility operations)

What the group claims

TOC Building is a commercial facility that provides a comprehensive floor guide, event information, and tenant details for visitors. The building hosts a variety of shops and services, including clothing stores, kitchenware, and cafes. It aims to attract a diverse clientele, including families and individuals looking for shopping and entertainment options. The official website offers updates on new shops and events to keep customers informed.

Sources

Source

Indexed 7 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Lynx

Lynx is a relatively new ransomware group that emerged in July 2024, operating with apparent financial motivations and demonstrating rapid scaling capabilities with 397 documented victims within their first few months of operation. The group's origin and specific affiliations remain unclear due to their recent emergence, though their targeting patterns suggest a sophisticated operation that may operate independently rather than as a traditional Ransomware-as-a-Service model. Based on their victim distribution, Lynx appears to employ broad-spectrum targeting methodologies focusing heavily on English-speaking countries, with the United States, United Kingdom, Canada, Germany, and Australia representing their primary geographic targets, while concentrating their attacks on manufacturing, business services, technology, and transportation/logistics sectors, though specific technical details regarding their initial access vectors, encryption methods, and data exfiltration practices have not yet been extensively documented by major security research organizations. Due to the group's recent emergence, there are no widely reported major campaigns or high-profile incidents that have gained significant public attention from law enforcement agencies or established threat intelligence firms. As of late 2024, Lynx appears to remain active with no reported law enforcement disruptions or operational changes. The group has been linked to 414 public disclosures across our corpus. First observed on a leak site on July 29, 2024; most recent post June 18, 2026. The operation is currently active.

Timeline of this disclosure

  • December 6, 2025www.toc.co.jp listed by Lynxon the group's public leak site

Other recent disclosures by Lynx

Lynx has been linked to 414 public victims on Darkfield. A sample of the most recent:

See the full Lynx dossier →

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 1,081 disclosures indexed across all operators we track. Geographically, www.toc.co.jp is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Lynx means www.toc.co.jp appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, JPCERT/CC (Japan), as required for your jurisdiction.
  • Monitor for the data appearing on Lynx's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.