> JapanHacked_
[Investigating][Severity: Moderate][Intrusion]

TOC: unauthorized access to its network encrypted some of its files

A third party gained unauthorized access to the network of Tokyo Prime-listed TOC, and the company confirmed that some files were encrypted.

Disclosed

2025-12-08

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. It confirmed unauthorized access to its network by a third party. [1] [2]

  2. It announced the unauthorized access. It is working with outside experts on investigating the scope, restoring systems and identifying affected information. [1] [2]

  3. In a follow-up report it announced that it had confirmed the encryption of some files. [3]

Impact

The company says the effect on its earnings forecast is still being examined. [2]

Timeline

  1. Detected 2025-12-04
  2. Disclosed 2025-12-08
  3. 4 days

Attack or cause

Method
[Intrusion]
Impact
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]当社ネットワークへの不正アクセスについてTOC Co., Ltd. · 2025-12-08
  2. [2][News]テーオーシーのネットワークに不正アクセス、業績予想に及ぼす影響については精査中ScanNetSecurity · 2025-12-23 08:10
  3. [3][News]テーオーシーのネットワークへの不正アクセス、ファイルの一部の暗号化を確認ScanNetSecurity · 2025-12-24 08:10