One Telegram Listing: The 2.3KK Mix Private Base Held 2.2M Passwords

In March 2023, HEROIC analysts identified a massive stealer log dubbed "2.3KK Mix Private Base" circulating on a Telegram channel. The archive contained 2,236,875 records harvested from infected devices, including email addresses, plaintext passwords, and the URLs tied to each login. The "2.3KK" name refers to the roughly 2.3 million entries the file holds, one of the larger stealer logs HEROIC analysts have tracked being traded in private Telegram groups.

Why This Is Dangerous

A private base of this size is dangerous because of both its scale and its precision. Each of the 2,236,875 records pairs a specific email address with the exact plaintext password used and the website it unlocks, so an attacker does not need to crack or guess anything. At over two million entries, automated tools can work through the list at high speed, testing credentials against banking portals, email providers, and social platforms far faster than any single victim could react.

What Was Exposed

This leak included the following data types:

• Email addresses
• Plaintext passwords
• URLs linked to each set of credentials

Why This Matters

A base of over 2.2 million email and password pairs is exactly the kind of dataset that fuels large-scale credential stuffing campaigns, where attackers systematically try stolen logins across hundreds of unrelated websites. Because so many people reuse passwords, a single exposed credential can unlock email, banking, and social media accounts that were never part of the original breach. Given the private nature of this "base," it was likely compiled and sold specifically for this kind of large-scale account takeover activity, rather than shared casually.

How Stealer Logs Work

A stealer log is produced by information-stealing malware, malicious software that infects a device through channels like cracked software, fake downloads, or phishing attachments. Once active, it silently pulls saved passwords, autofill data, and active browser sessions from the infected machine and bundles them into a file. Large "private base" collections like this one are typically assembled by combining thousands of individual stealer logs into a single mega-file, then sold or traded among cybercriminals on Telegram, making them a significant driver of the stolen credential market.

Check If You Are Affected

With 2,236,875 records in this single stealer log, checking your exposure is one of the most important things you can do right now. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including private stealer bases like this one, so you can find out in seconds and update any reused passwords before an attacker gets there first.