Dark Web Intel: 497,637 Credentials From the 999K Poland Mix Dump

HEROIC analysts identified a combolist file circulating on Telegram named “COMBOLIST 999K POLAND MIX FRESH 100.” The file surfaced on November 14, 2025 and contains 497,637 records pairing login credentials with plaintext passwords, along with the URLs of the sites each login was meant to unlock. The uploader's own label advertises the file as containing close to 999,000 records, though HEROIC's analysis confirmed 497,637 usable records in the version that surfaced, and the “Poland” tag in the name has not been independently verified against every record.

Why the Real Number Still Matters

Marketing labels on combolists frequently overstate size or freshness to attract buyers, which is why HEROIC reports on the number of records actually verified rather than the number claimed in the file's name. Because every password in this file is stored in plaintext, anyone who downloads the list can read and use each credential immediately, with no cracking or decrypting required. Combined with the target URLs included in the file, an attacker does not need to guess where to try a stolen login. The file tells them exactly where to go.

What Was Exposed

• Email addresses tied to the accounts in this file, usable to identify and target victims directly.
• Plaintext passwords, stored and shared with no encryption, meaning anyone who obtains the file can read them instantly.
• URLs showing exactly which site or service each credential pair unlocks, making it trivial for an attacker to know where to try each login.

Why Nearly 500,000 Records Is Still a Big Deal

Even at the confirmed count of nearly 500,000 records, this remains one of the larger combolists in this batch, with enough volume to fuel a sizeable automated credential-stuffing campaign. The core risk with any combolist is credential stuffing: automated tools that take every email and password pair and try it against dozens of popular websites in seconds. If you have ever reused a password across more than one account, and most people have, a single leaked line here can lead to a compromised email account, drained loyalty points, hijacked social media, or worse.

How Combolist Marketing Labels Can Mislead Buyers

Combolists are the underground economy's recycling bin: old and new stolen credentials, pulled from breaches, phishing kits, and malware logs, get merged into a single file and passed around Telegram channels and forums. They are cheap to produce and cost attackers almost nothing to test, which is why they remain one of the most common commodities in the cybercrime marketplace.

Once a combolist is in circulation, automated tools run through every entry against major websites, checking which logins still work. This is called credential stuffing, and it succeeds far more often than it should, because so many people reuse passwords across multiple accounts.

Check If You Are Affected

The safest move after any exposure like this is to find out quickly whether your own information is part of it. HEROIC's free breach scanner checks your email address against a database of more than 400 billion breached and leaked records, including combolists, stealer logs, and other underground dumps like this one. If a match turns up, change the affected password immediately, enable multi-factor authentication wherever it is offered, and avoid reusing that password anywhere else.