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
- Detected 2026-04-02
- Disclosed 2026-05-12
- 40 days
Attack or cause
- Method
- [Ransomware]
- Impact
- [Data leak]
- Entry point
- Unknown
Data exposed or at risk
Organizations involved
[Breached][Critical]Tokyo, ChiyodaConstruction
Tokyo Hoso Kogyo Inc.
Sources
- [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][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