Japanese Users Targeted: HQ Japan Exposes 40,046 Passwords

HEROIC has identified a massive stealer log file titled HQ Japan UHQComboz on Telegram that contains 40,046 compromised records targeting Japanese users. The dump includes email addresses, plaintext passwords, and the URLs of websites where the credentials were originally entered, all harvested by infostealer malware from infected devices across Japan.

40,046 Plaintext Passwords Now in the Open

Every password in this dump is stored in clear, readable text. Attackers do not need to invest time or computing power to decode them. With over 40,000 credentials available in plaintext, this leak represents a significant volume of accounts that can be accessed instantly by anyone who obtains the file.

What Was Exposed

• Email addresses belonging to Japanese internet users
• Plaintext passwords captured from browser storage and form entries
• URLs of Japanese and international websites where logins occurred

The Scale of Credential Stuffing Risk

With 40,046 credential pairs, attackers can launch large-scale credential stuffing campaigns against Japanese banking platforms, e-commerce sites, and social networks. Each email-password pair is tested against dozens of services simultaneously. For users who reuse their passwords, this single leak could compromise their entire online presence.

Infostealer Malware: The Silent Credential Harvester

Stealer logs like this originate from infostealer malware that spreads through malicious email attachments, compromised websites, and fake application downloads. The malware runs undetected, extracting saved credentials from browsers, recording keystrokes, and capturing authentication cookies. The collected data is then compiled and distributed through Telegram channels and underground marketplaces.

Check If Your Credentials Were Exposed

Japanese internet users should check immediately whether their accounts appear in this dump. Use the HEROIC breach scanner to search more than 400 billion compromised records for your email address. With a leak of this magnitude, early detection is critical to preventing unauthorized account access and identity theft.