ARCEUSULP Leak: 2.9M Passwords Could Unlock Other Accounts

On 20-Jun-2026, HEROIC analysts identified a stealer log file, shared by a Telegram user under the label "ARCEUSULP 159 3369343," containing 2,937,099 records. The file includes email addresses, plaintext passwords, and the URLs of the websites those credentials belong to.

Why This ARCEUSULP Leak Could Unlock More Than One Account

Each of the nearly 3 million records in this file pairs a plaintext password with the exact site it unlocks, but the real danger reaches further than that one login. Most people reuse passwords across multiple accounts, so a single exposed password from this file doesn't just open the door it was stolen from, it can unlock email, banking, or shopping accounts too, anywhere that same password was used again.

What Was Exposed

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

Why This Matters

With 2,937,099 records exposed, the immediate concern is account takeover on the exact services listed in the file. The bigger, chained risk comes from credential stuffing, where attackers take confirmed email and password pairs like these and test them against dozens of other popular sites, counting on the fact that reused passwords let one leak compromise several accounts at once.

How Stealer Logs Work

Stealer logs come from malware that infects a device, often through a fake download, cracked software, or a malicious attachment, and then quietly copies whatever the browser has saved: passwords, autofill data, and the web addresses tied to each login. That harvested data is compiled into a log, like this 2,937,099-record file, and shared or sold through channels such as Telegram.

Check If You Are Affected

With almost 3 million records in this leak, checking your exposure is worth the two minutes it takes. HEROIC's free breach scanner checks your email address against more than 400 billion leaked and dark web records, so you can find out where you're exposed and change any reused passwords before they open more than one door.