The Combolist 3M Japan Mix Leak Data Quietly Appeared on the Dark Web

HEROIC analysts identified this stealer log on 03-Dec-2025. The breach exposed 2,626,522 records, with stolen data including email addresses, plaintext passwords, and URLs. The source is identified as Combolist 3M Japan Mix Fresh 100, uploaded by a Telegram user.

Why This Is Dangerous

With over 2.6 million freshly verified email and password pairs targeting Japanese accounts, this is one of the larger credential leaks in this series. The credentials are labeled fresh and verified, meaning they represent active accounts that attackers can access without any additional steps. A breach of this size provides enough data to run large-scale automated attacks.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (website addresses where each credential was captured)

Why This Matters

The Combolist 3M Japan Mix leak puts millions of accounts at risk of credential stuffing attacks, where automated tools test each stolen login across multiple websites. For individuals affected, the risks include account takeover on banking platforms, e-commerce sites, and social media. Plaintext passwords also make it easier for criminals to guess related passwords used on other services, increasing the impact beyond just the accounts listed in this file.

How a Stealer Log Works

Combolists like this one are assembled from stealer malware output. The malware infects devices through deceptive downloads or phishing campaigns, then collects every username and password stored in the browser. Criminals aggregate these records, filter them by region or email provider, verify which ones are still active, and distribute the final lists on dark web forums and encrypted messaging apps.

Check If You Are Affected

HEROIC offers a free breach scanner that searches 400 billion records. Search your email address now to see if your credentials appear here or elsewhere. Free, takes seconds.