> JapanHacked_
[Contained][Severity: Critical][Ransomware]

Tokyo Hoso Kogyo: ransomware attack

On 2 April, paving contractor Tokyo Hoso Kogyo found access to its systems blocked, apparently by ransomware, and cut the devices off the network. On 12 May it said customer and partner company names, contact names, emails and bank details, and employee names, addresses and birth dates may have leaked. The final report on 31 July said attackers got into the internal network by exploiting a vulnerability in some network devices, and no evidence of data being taken was found.

Disclosed

2026-05-12

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-04-02
  2. Disclosed 2026-05-12
  3. 40 days

Attack or cause

Method
[Ransomware]
Impact
[Data leak]
Entry point
Unknown

Data exposed or at risk

[Name][E-mail address][Bank account][Postal address][Date of birth][Employment]

Organizations involved

Open in organization search

Sources

  1. [1][Official]ランサムウェア攻撃による被害についてTokyo Hoso Kogyo · 2026-05-12
  2. [2][Official]ランサムウェア攻撃による被害について(最終報)Tokyo Hoso Kogyo · 2026-07-31