2.7M Leaked: ARCEUSULP 158 3246616 uploaded by a Telegram User

2.7 Million Records Quietly Surfaced on Telegram

HEROIC analysts identified a stealer log titled "ARCEUSULP 158 3246616," tracing back to a June 2026 collection date. There was no dramatic announcement or marketing around its release, just another file quietly uploaded to a Telegram channel. But the size of that file is anything but quiet: 2,714,848 records made up of email addresses, plaintext passwords, and the URLs those logins belong to, making this one of the largest single leaks HEROIC has reviewed recently.

Why This Is Dangerous

The "ULP" in the file's name stands for User, Login, Password, a format built specifically so attackers can plug the data straight into automated tools. With nearly 2.7 million ready-to-use email and password pairs, each matched to its exact login URL, this file gives attackers an enormous head start, no cracking, no guessing, just direct access at a scale most people never expect from a leak they never heard announced anywhere.

What Was Exposed

• Email addresses
• Plaintext passwords
• Login URLs

Why This Matters

At close to 2.7 million records, the potential for harm spans far beyond any one website. Automated credential stuffing tools can run through a file this size in bulk, testing stolen passwords against email, banking, and shopping accounts wherever they were reused. The scale alone significantly increases the odds that any individual's information is caught up in it, leading to account takeover, identity theft, and financial fraud that most affected people will never trace back to this quiet upload.

How a Multi-Million Record ULP Log Gets Built

Stealer logs like this one come from infostealer malware that infects individual devices and copies saved browser passwords, autofill data, cookies, and the addresses tied to them. To reach millions of records, a distributor combines the output of huge numbers of infections, then reformats the results into the standardized ULP structure so it can be used immediately for large-scale credential stuffing. A file this size does not appear overnight, it reflects an extended, ongoing harvesting operation quietly feeding into channels like the one where this leak surfaced.

Check If You Are Affected

A leak this large deserves attention even though it never made headlines. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including massive stealer logs like this one, so you can find out quickly whether you were exposed and change your passwords before an automated attack finds you first.