USA Part3 18 Stealer Log Leak Exposes Nearly 19,000 Accounts

HEROIC analysts flagged a dataset called "USA Part3 18" after it was uploaded to a Telegram channel, with the underlying data dated to March 23, 2023. The file contains 18,935 records, each pairing an email address with a plaintext password and the URL of the site where the credential was used. Compared to smaller stealer logs HEROIC tracks, this file is more than 80 times larger, illustrating how widely the scale of these Telegram-distributed logs can vary from one upload to the next.

Why the USA Part3 18 Leak Is Dangerous

Nearly 19,000 plaintext email and password pairs give an attacker a large, ready-to-use list for automated login attempts. Because the passwords are unencrypted and each one is linked to the specific URL it was used on, criminals can run these credentials through login pages at scale using simple scripts, without ever needing to guess or crack a password.

What Was Exposed

• Email addresses
• Plaintext passwords
• Login URLs tied to each credential

Why This Matters

With close to 19,000 accounts involved, this leak has real potential for credential stuffing, where attackers try the same email and password combination across many popular websites. Anyone in this dataset who reused their password elsewhere faces a meaningfully higher risk of account takeover, financial fraud, or identity theft, especially since the passwords require no extra effort to use.

How Stealer Logs Work

"USA Part3 18" is part of a broader category HEROIC tracks as stealer logs, output from information-stealing malware rather than a breach of a specific company's servers. Victims are typically infected through cracked software, malicious email attachments, or fake downloads. Once active, the malware harvests every saved password and autofill entry from the victim's browser and packages it into a log file for the attacker to sell or distribute. The "Part3" and "18" in the file's name suggest this was one installment in a larger series of logs being released in batches, a common pattern for stealer log sellers looking to build a reputation and drive repeat sales.

Check If You Are Affected

If you had a US-based email account active around March 2023, it's worth checking whether it's part of this leak. HEROIC's free breach scanner searches more than 400 billion breached records, stealer logs included, so you can quickly find out if your credentials were exposed and change any passwords that need it.