30,703 Leaked: ARCEUSULP 131 30899 uploaded by a Telegram User

Inside the ARCEUSULP Log: 30,703 Login and Password Pairs Leaked

In late June 2026, HEROIC analysts identified a stealer log titled "ARCEUSULP 131 30899" uploaded by a Telegram user. The "ULP" in the name stands for User, Login, Password, a common shorthand in the stealer log world for files formatted as ready-to-use credential pairs. This particular file contained 30,703 records made up of email addresses, plaintext passwords, and the URLs those logins belong to.

Why This Is Dangerous

A ULP formatted log is built specifically for speed and ease of use. Each line pairs a username or email with its plaintext password and the exact web address it unlocks, which means an attacker, or automated software acting on an attacker's behalf, can attempt to log into tens of thousands of accounts in rapid succession without any additional effort.

What Was Exposed

• Email addresses
• Plaintext passwords
• Login URLs

Why This Matters

With over 30,000 records in ULP format, this file is essentially plug and play for credential stuffing attacks, where attackers use automated tools to test the same email and password combination across many different websites. Anyone whose information appears here faces a heightened risk of account takeover, and if a password was reused across email, banking, or shopping accounts, the danger multiplies well beyond the original site tied to the leak.

How ULP Stealer Logs Work

ULP stands for User, Login, Password, and it refers to the standardized format that infostealer malware output is often converted into before distribution. After malware harvests saved browser credentials, autofill data, and cookies from an infected device, the raw data is reformatted into simple lines of email, password, and URL, making it easy for buyers to load directly into credential stuffing tools. This standardization is exactly what makes ULP logs, including this one, so efficient for attackers to use at scale.

Check If You Are Affected

Because ULP formatted data is built for fast, automated abuse, checking your exposure quickly matters. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including ULP formatted stealer logs like this one, so you can find out if you were exposed and change your passwords before an automated attack tries them for you.