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[Investigating][Severity: Critical][Malware]

Nihon Kotsu: malware attack

In the early hours of 11 July, taxi operator Nihon Kotsu found its internal systems had been hit by malware and cut them off. Online hire car orders and bookings, phone taxi dispatch and online registration for its maternity taxi service stopped. On 22 July it found information suspected to be stolen from it on the internet, and on 19 August it said some of its files had leaked. Phone dispatch and other services resumed on 6 October.

Disclosed

2026-07-13

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-07-11
  2. Disclosed 2026-07-13
  3. 2 days

Attack or cause

Method
[Malware]
Impact
[Data leak][Service outage]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]弊社システムへの不正アクセスによるシステム停止に関するお詫びとご報告Nihon Kotsu · 2026-07-13
  2. [2][Official]弊社システムへの不正アクセスによるシステム停止について(第3報)Nihon Kotsu · 2026-07-22
  3. [3][Official]弊社システムへの不正アクセスによるシステム停止について(第4報)Nihon Kotsu · 2026-08-19
  4. [4][Official]一部サービスの復旧についてNihon Kotsu · 2026-10-05