ARCEUSULP Stealer Log Surfaces Weeks After 14,892 Leaked

ARCEUSULP 89 16491 Stealer Log: 14,892 Records Surface Weeks Later

The data behind this leak was captured on 02-Jul-2026, but it did not surface publicly until HEROIC analysts found it weeks later, uploaded by a Telegram user in a file named "ARCEUSULP 89 16491." By the time it was spotted, 14,892 records were already circulating, each one pairing an email address with a plaintext password and the URL of the site the login was captured on.

Why This Stealer Log Is Dangerous

The delay between capture and discovery matters because it gives attackers a head start. Anyone who had this file before HEROIC found it could have already tried these logins, meaning some of the 14,892 accounts may have been accessed weeks before their owners had any way of knowing. Each record includes the exact site the password belongs to, so there is no guessing involved, and the plaintext passwords mean no extra effort is needed to use them.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites the credentials were used on

Why This Matters

Because this data may have been circulating quietly for weeks before it was identified, anyone in this file faces a real risk of credential stuffing and account takeover, especially if they reuse the same password on other accounts like email or banking. The longer stolen credentials go unnoticed, the more time attackers have to test them against other services and cause damage before anyone changes a password.

How Stealer Logs Work

Stealer logs come from malware that infects a device and quietly copies saved browser logins, passwords, and the sites they work on. That stolen data is then packaged into a log file and passed around in Telegram channels and dark web marketplaces, sometimes sitting unnoticed for weeks before researchers or the public become aware it exists, exactly what happened with this file.

Check If You Are Affected

Since this data may have been exposed for weeks before it was found, it is worth checking your status now rather than later. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, so you can find out quickly and update any passwords that may already be compromised.