970K Records Exposed: ARCEUSULP 18 1243497 uploaded by a Telegram User

On 20-Jun-2026, HEROIC analysts identified a stealer log file, uploaded by a Telegram user under the label "ARCEUSULP 18 1243497," containing 970,646 records. The data was harvested directly from infected devices and includes email addresses, plaintext passwords, and the URLs of the websites those logins belong to.

Why This Stealer Log Is Dangerous

Unlike breaches where passwords are stored as scrambled hashes that attackers have to crack, stealer logs contain passwords exactly as they were typed, in plain, readable text. That means anyone who gets a copy of this file can log straight into an account with no extra work. Pairing each password with the exact URL it unlocks makes things worse: an attacker doesn't have to guess which site a credential belongs to, they already know, and can go straight to that login page and try it.

What Was Exposed

• Email addresses
• Plaintext passwords
• The login URLs tied to each set of credentials

Why This Matters

If you reuse the same password across multiple sites, one exposed login can unlock several of your accounts, not just the one the malware originally targeted. This creates a real risk of account takeover on email, shopping, and social accounts, and it also fuels credential stuffing attacks, where criminals feed lists like this one into automated tools that try the same email and password combination on hundreds of other websites at once.

How Stealer Logs Work

Stealer logs come from a category of malware built to quietly infect a device, often through a fake download, cracked software, or malicious attachment, and then vacuum up whatever is saved in the browser: stored passwords, autofill data, and the web addresses tied to each login. That harvested data is packaged into a "log" and uploaded to channels like Telegram, where it's shared or sold in bulk, exactly as happened with this 970,646-record file.

Check If You Are Affected

The fastest way to know if your information appears in this or any other leak is to check it directly. HEROIC's free breach scanner searches your email address against a database of more than 400 billion leaked and dark web records, so you can find out where your credentials have surfaced and take action, like changing passwords, before someone else uses them first.