4M Records Leaked in HUNTER_ULP Breach: Check If Affected

On November 1, 2025, HEROIC analysts uncovered a stealer log named "HUNTER_ULP Private New Base" circulating on Telegram. Marketed as a private, freshly harvested collection, the file contained 4,057,846 records, each combining an email address, a plaintext password, and the URL of the site those credentials unlock. Being labeled "private" means it likely wasn't shared publicly right away, giving a smaller circle of buyers first access to millions of untouched logins.

Why This Is Dangerous

A private base like this is especially risky because it hasn't been picked over yet. The passwords are current, the accounts are likely still active, and the data is organized cleanly by URL, so criminals can move straight to testing logins on banking sites, email providers, and online stores without any extra effort.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the associated accounts

Why This Matters

At over four million records, this leak is large enough to fuel widespread credential stuffing campaigns, where automated tools try the same login pairs across countless websites. Because so many people reuse passwords, a single exposed credential can open the door to account takeover on multiple platforms, followed by identity theft or financial fraud once an attacker reaches a banking or payment account.

How Stealer Logs Work

Bases like HUNTER_ULP come from infostealer malware that infects devices through cracked downloads, fake installers, or phishing links. The malware quietly extracts saved passwords and autofill data from the browser, then compiles it into a structured file. Sellers often brand these files as "private" or "fresh" to boost their price, since buyers pay more for data that other criminals haven't already exploited.

Check If You Are Affected

With millions of records like this circulating on Telegram, the only way to know for certain if you're affected is to check. Head to HEROIC's free breach scanner and search your email against a database of more than 400 billion leaked records. It takes only seconds, and it's the fastest way to find out if your passwords need to change today.