What Is a Stealer Log? Xavier_Group Leak Exposes 147,199 Passwords

Another Xavier_Group Stealer Log Appears on Telegram

HEROIC analysts identified a second stealer log tied to the same source, labeled "Xavier_Ulp - 345000 Xavier_Group," uploaded by a Telegram user on 25-Jul-2026. This batch contains 147,199 records made up of email addresses, plaintext passwords, and the URLs those credentials were captured from.

What a Stealer Log Actually Is

A stealer log is not a hacked database in the traditional sense. It is a collection of information pulled directly off individual, infected computers by malware designed to quietly copy anything saved in the browser: passwords, autofill fields, and the addresses of the sites those logins belong to. Instead of one company being breached, thousands of separate personal devices are each compromised individually, and their stolen data gets bundled together into a single file like this one.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs identifying the exact site each login belongs to

Why This Matters

With nearly 150,000 records in this batch alone, the account takeover risk here is significant. Because the passwords are stored in plaintext and matched to specific sites, an attacker can log in immediately, no cracking required. Anyone who reused an exposed password on another account is also exposed to credential stuffing well beyond the original site.

How Stealer Logs Work

Once the malware finishes harvesting data from an infected device, it packages everything into a file and sends it to whoever controls the malware. That person then organizes, labels, and often shares or sells the file, in this case on Telegram, where HEROIC analysts found it as part of ongoing monitoring of the same source.

Check If You Are Affected

With a leak of this size, checking your exposure is a smart precaution. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, and shows you immediately if you were affected. Run a free scan and change any password it flags.