> JapanHacked_
[Contained][Severity: Critical][Phishing][Credential abuse][Malware]

Rakuten Securities, SBI Securities and others: accounts were taken over with phishing-stolen credentials, and holdings were sold to buy Chinese stocks

Intruders used stolen logins to sell holdings and buy Chinese and other stocks. In 2025 there were 9,752 unauthorized trades worth about 739.3 billion yen.

Disclosed

2025-03-25

Organizations involved

6

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. Rakuten Securities announced that login IDs, passwords and trading PINs had been taken through phishing, spyware or malware and used for unauthorized trades. It temporarily stopped buy orders for 582 Chinese (Hong Kong) stocks that may have been involved. [1]

  2. The Financial Services Agency warned of unauthorized access and trades using information stolen through fake securities company sites and similar means. [2]

  3. The Financial Services Agency's tally from February to April 16 showed unauthorized trades at six firms: Rakuten Securities, SBI Securities, Nomura Securities, Monex, SMBC Nikko Securities and Matsui Securities. It counted 3,312 unauthorized accesses and 1,454 unauthorized trades, with about 50.6 billion yen sold and 44.8 billion yen bought. [3]

  4. The Japan Securities Dealers Association announced that 10 major and online securities firms had agreed to compensate customers for damage to a certain extent. [4]

  5. The Financial Services Agency's summary showed 17,559 unauthorized accesses and 9,752 unauthorized trades in 2025, worth about 739.3 billion yen. [5]

Impact

In most cases, holdings in the account were sold and the proceeds used to buy small-cap stocks such as Chinese stocks. There were no cases of money being withdrawn to a third party. The Financial Services Agency said the damage was not limited to particular firms and could happen at any securities company. [2] [3]

Timeline

  1. Detected, Disclosed 2025-03-25
  2. 1 days

Attack or cause

Method
[Phishing][Credential abuse][Malware]
Impact
[Fraud][Financial loss]
Entry point
Stolen credentials

Data exposed or at risk

[Passwords]

Organizations involved

Open in organization search

Sources

  1. [1][Official]フィッシング詐欺などによる不正取引発生を受けた当社の取り組みとセキュリティ強化のお願いRakuten Securities, Inc. · 2025-03-25
  2. [2][Official]インターネット取引サービスへの不正アクセス・不正取引にご注意くださいFinancial Services Agency · 2025-04-03
  3. [3][News]証券口座の乗っ取り、勝手に株売却し中国株など購入…2か月半で不正取引1454件The Yomiuri Shimbun · 2025-04-18
  4. [4][Official]フィッシング詐欺等による証券口座への不正アクセス等による対応についてJapan Securities Dealers Association · 2025-05-02
  5. [5][News]証券不正取引、計7393億円 昨年の口座乗っ取り被害―金融庁Jiji Press · 2026-01-14