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

Avant Group: its subsidiary Internet Disclosure was accessed without authorization and stopped services such as "Kaiji Net" and "Soumu Net"

A subsidiary was accessed without authorization in the early hours of May 30 and cut its network, stopping services such as "Kaiji Net". Other group companies are unaffected.

Disclosed

2023-05-31

Organizations involved

2

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. From the early morning it confirmed that Internet Disclosure was being accessed by a third party without authorization. From the same day it cut the network and stopped providing its services and publishing its website. [1] [3]

  2. It announced the case. A response team is recovering the systems and handling possible secondary attacks, and is checking the possibility of an information leak with outside experts. [1] [3]

  3. It published a second report. [2] [3]

  4. Some services were resumed. [4]

Impact

The services that stopped were the Internet Disclosure website, Kaiji Net, Soumu Net, eRules and the typo checker. The effect is limited to the subsidiary, and no effect on the systems and services of other Avant Group companies has been confirmed. [1] [3]

Timeline

  1. Started, Detected 2023-05-30
  2. Disclosed 2023-05-31
  3. 1 days

Attack or cause

Method
[Intrusion]
Impact
[Service outage]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]第三者からの不正アクセスによるサービス提供の停止についてAvant Group Corporation · 2023-05-31
  2. [2][Official]当社グループ会社における第三者からの不正アクセスによるサービス提供の停止について（第2報） | ニュース | 株式会社アバントグループAvant Group Corporation · 2023-06-05
  3. [3][News]アバントグループ子会社に不正アクセス、「開示 Net」「総務 Net」をはじめとするサービスの提供を停止ScanNetSecurity · 2023-06-05 08:05
  4. [4][News]アバントグループ子会社へのランサムウェア攻撃、一部サービスの提供を再開ScanNetSecurity · 2023-06-13 08:05