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  • Japan ’s FSA warns of unauthorized trades via stolen credentials from fake security firms’ sites

Japan ’s FSA warns of unauthorized trades via stolen credentials from fake security firms’ sites

Pierluigi Paganini April 22, 2025

Japan ’s Financial Services Agency (FSA) warns of hundreds of millions in unauthorized trades linked to hacked brokerage accounts.

Japan ’s Financial Services Agency (FSA) reported that the damage caused by unauthorized access to and transactions on internet trading services is increasing.

“There has been a sharp increase in the number of cases of unauthorized access and unauthorized trading (trading by third parties) on Internet trading services using stolen customer information (login IDs, passwords, etc.) from fake websites (phishing sites) disguised as websites of real securities companies.” reads the FSA’s alert.

FSA warns that cases of unauthorized trading via stolen login data from phishing sites mimicking real securities firms are sharply increasing on online trading platforms.

Below are some data provided by the agency that reflect only currently known cases of unauthorized access and fraudulent trading, however, more undiscovered incidents may exist.

When did it occur?February 2025March 2025April 2025
(as of the 16th)
3 months total
Number of securities firms where fraudulent transactions occurred246–
Number of unauthorized accesses431,4221,8473,312
 Number of fraudulent transactions336857361,454
  Sale priceApproximately 100 million yenApproximately 13.1 billion yenApproximately 37.4 billion yenApproximately 50.6 billion yen
  Purchase priceApproximately 30 million yenApproximately 12.8 billion yenApproximately 32 billion yenApproximately 44.8 billion yen

Typically, attackers hijack victim accounts, sell held stocks, and use the proceeds to buy assets like Chinese stocks, which remain in the account post-attack. Reported sales and purchase amounts represent total transaction volumes, not customer losses.

To avoid falling victim to unauthorized trading caused by stolen login credentials, users should follow key precautions: never click links in emails or SMS, always access brokerage sites via pre-saved bookmarks, and enable security features like multi-factor authentication and login notifications. Avoid password reuse, choose complex passwords, and check account activity often. If you suspect fraud, change passwords and contact your brokerage immediately. Keeping devices updated and using reliable antivirus software also helps prevent malware-related data theft.

Japan ’s Financial Services Agency (FSA) recommends checking the warning issued by the Japan Securities Dealers Association regarding matters to be aware of when using securities companies’ online trading services.

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs –hacking, Japan)


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