Here Is Exactly What Attackers Can Do With 3,905 Leaked Logins

A combolist file uploaded to Telegram on 10-Oct-2023 carried 3,905 email addresses paired with plaintext passwords and login URLs, and HEROIC analysts confirmed every entry is genuine. The interesting part is not the number itself, it is what happens the moment someone with bad intentions opens the file. Find out if your credentials are among them with a scan your email.

What an Attacker Actually Does With This Data

First, they load the list into automated login software and test each pair against the site listed in its URL. Anything that still works gets flagged and reused, either to log into the account directly or to try the same email and password against banking, email, and shopping sites in case it was reused elsewhere. None of this requires special skill, only the list itself.

What Was Inside This Dataset

• Email addresses: confirm the account tied to each password and support targeted phishing.
• Plaintext passwords: usable immediately, with no cracking step needed.
• Login URLs: tell an attacker exactly which service each credential applies to.

Why This Still Matters Years Later

A leak from 2023 does not expire. Passwords that were never changed are still sitting there waiting to be tried, and people frequently reuse the same password for years across multiple accounts. Age does not reduce the risk of a plaintext credential file, it just means there has been more time for it to circulate.

How a Combolist Like This Gets Assembled

Combolists are built by pulling matching email and password pairs from earlier leaks, malware infections, or manual scraping, then formatting them into one line per account for easy reuse. The goal is credential stuffing, testing the same pair against as many services as possible rather than targeting one site alone.

How Can You Tell If You Are in the 3,905?

Scan your email to check whether your address appears in this dataset or in any other leak HEROIC has tracked. If it does, change that password right away, stop reusing it on other accounts, and turn on multi-factor authentication wherever it is offered. This matters for a work email address as much as it does for a personal one.