Inside the ARCEUSULP Stealer Log: 1,687 Passwords Leaked

In June 2026, a stealer log file named "ARCEUSULP 134 1690" began circulating on a Telegram channel used to trade harvested login data. Inside were 1,687 sets of credentials, email addresses, plaintext passwords, and the URLs of the accounts they unlock, all pulled straight from devices infected with information-stealing malware.

Imagine 1,687 Logins Landing in a Criminal's Inbox

Picture a buyer downloading this file within hours of it appearing on Telegram. They open it in a spreadsheet and see row after row: an email address, a password sitting in plain text, and the exact website it opens. There is no guessing involved and no password cracking needed. Within minutes, that buyer can start testing each pair against email providers, banking portals, and online stores, looking for logins that still work.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the accounts and websites those logins access

Why This Matters

Because the passwords in this log were stored in plaintext, they are immediately usable, no decryption required. Attackers automate this kind of testing across thousands of accounts at once, a technique called credential stuffing. Anyone in this batch who reused a password on another site risks a domino effect: one exposed login can lead to account takeover on multiple platforms, identity theft, and direct financial fraud if banking or shopping accounts are involved.

How a Stealer Log This Size Gets Built

Logs like ARCEUSULP 134 1690 are the output of information-stealing malware that infects a device, often bundled inside pirated software, cracked games, or a malicious download, then quietly harvests every password saved in the browser along with the web address each one belongs to. The malware packages everything from every infected device it controls into one file and sends it to the attacker, who then lists it on Telegram, sometimes for sale, sometimes as a free sample to build a reputation.

Check If You Are Affected

You do not need this exact file to find out if you are at risk. HEROIC's free breach scanner checks your email against more than 400 billion leaked and breached records, including stealer logs like this one, and shows you instantly whether your information has surfaced. If it has, change the exposed password right away, update it anywhere else you used it, and turn on two-factor authentication wherever you can.