Researchers Watch 9,966 Credentials From USA3 Leak Spread on Telegram

HEROIC threat analysts observed a stealer log file labeled "USA3" circulating on a Telegram channel after being uploaded on July 5, 2026. The file contained 9,966 individual records, each linking an email address to a plaintext password and the URL of the service where those credentials were used. Researchers tracked the file as it spread across multiple channels, noting that anyone with access could download and exploit the data without restriction.

Why Nearly 10,000 Plaintext Credentials Are a Serious Threat

With 9,966 records containing passwords in readable plaintext, there is zero barrier for attackers. No decryption tools or specialized skills are required. Anyone who downloads this file can immediately attempt to log into the accounts listed. Because the data also includes the URLs where each credential was used, attackers know exactly which services to target first. This makes automated account takeover attempts fast and efficient.

What Was Exposed in the USA3 Stealer Log

• Email addresses linked to personal and professional accounts
• Plaintext passwords stored without any form of protection
• URLs revealing the specific websites and online services tied to each login

Why This Leak Fuels Larger Attacks

A dataset of nearly 10,000 credentials is prime material for credential stuffing operations. Attackers feed these email and password combinations into automated tools that test them against banking sites, email providers, cloud platforms, and social networks. When people reuse the same password across multiple services, a single compromised pair can cascade into full account takeover, identity theft, and financial fraud. The inclusion of URLs also helps attackers prioritize high-value targets like financial institutions and corporate portals.

How Stealer Logs Capture Your Data

Stealer logs originate from information-stealing malware that infects personal computers and mobile devices. This malware quietly extracts saved credentials from web browsers, email applications, and password managers. It records which website each credential belongs to, building a comprehensive profile of the victim's digital life. The resulting log files are then distributed through Telegram groups, dark web marketplaces, and underground forums. Because stealer logs pull credentials from across every site a victim uses, a single infection can compromise dozens of accounts simultaneously.

Check If Your Credentials Were Compromised

If your email address could appear in this dataset, do not wait. HEROIC offers a free breach scanner that checks your credentials against more than 400 billion compromised records collected from known breaches and stealer log distributions worldwide. A quick scan can reveal whether your accounts are exposed and give you the chance to change passwords and secure your accounts before attackers act.