U.S. Users Targeted: ARCEUSULP 8 Exposes 36 Passwords

In June 2026, HEROIC's threat intelligence detected a stealer log labeled ARCEUSULP 8 36 being shared on Telegram. The file contains 36 records targeting users primarily in the United States, with each record exposing an email address, a plaintext password, and the URL of the compromised service. This is part of a broader ARCEUSULP stealer log series that has produced multiple dumps of varying sizes.

Plaintext Passwords: No Processing Needed

All 36 passwords in the ARCEUSULP 8 dump are fully plaintext. They are not encrypted, not hashed, not obfuscated. Each one appears as the exact string the user originally typed. An attacker who opens this file can read and use every credential without any tools or technical skill beyond basic literacy.

What Was Exposed

• Email Addresses — U.S.-based accounts used across various online services
• Plaintext Passwords — 36 unprotected credentials for immediate exploitation
• URLs — the websites and platforms tied to each compromised login

Credential Stuffing Does Not Require Large Datasets

While 36 records may seem modest, each credential pair is a live key that attackers will test across dozens of popular platforms. Banks, email providers, streaming services, retailers, and corporate tools are all targets. The geographic concentration on U.S. users means these credentials are especially likely to match accounts on American financial and technology platforms, amplifying the risk for affected individuals.

The ARCEUSULP Stealer Log Operation

ARCEUSULP 8 is part of an ongoing series of stealer log dumps generated by infostealer malware. The malware infects devices through common vectors—phishing emails, fake software installers, and compromised websites. It then quietly harvests saved credentials from web browsers and other applications, compiling them into segmented log files. These files are released in batches on Telegram, making the ARCEUSULP series a persistent and evolving threat to credential security.

Check If Your Credentials Were Exposed

U.S.-based users should take this leak seriously. HEROIC's breach scanner indexes over 400 billion compromised records, giving you the ability to check whether your email address or domain appears in the ARCEUSULP 8 dump or any other known breach. If your credentials are found, change them immediately on every platform and enable multi-factor authentication to block unauthorized access.