The YOULOGS MIX199pcs Breach Put 3,171 Stolen Email and Password Pairs Online

HEROIC analysts found a stealer log file called YOULOGS MIX199pcs uploaded to a public Telegram channel on November 4, 2023. The file contained 3,171 records, each one representing a real person's stolen credentials -- an email address, a plaintext password, and the URL of the service where that password was used. These records were not scraped from a website or stolen from a company database. They were pulled directly off infected computers by malware, packaged up, and posted publicly so anyone who wanted them could download them for free.

Why This Is Dangerous

The YOULOGS file exposed passwords in completely readable form -- no encryption, no hashing, nothing standing between an attacker and a working login. Combined with the email address and the specific URL for each credential, this data gives criminals everything they need to walk straight into someones account. The URL data is especially significant: rather than guessing which services someone uses, attackers already know. They can prioritize high-value targets like banking sites, email providers, and workplace tools immediately.

What Was Exposed

• Email addresses
• Plaintext passwords
• Website and service URLs tied to each credential

Why This Matters

Credential stuffing is the first thing criminals do with data like this. They feed the stolen email and password pairs into automated tools that try them across banking apps, email accounts, shopping platforms, and workplace systems all at once. Because most people reuse passwords, even one match can cascade into multiple account takeovers. From there, identity theft and financial fraud become real, immediate risks. Victims often do not discover the breach until money is missing, accounts are locked, or someone else has been impersonating them online. The YOULOGS MIX199pcs log makes all of this possable for any attacker willing to download a Telegram file.

How Stealer Log Breaches Work

Infostealer malware is software designed to harvest credentials silently from the devices it infects. It enters through phishing emails, fake software downloads, or malicious browser extensions. Once running, it collects saved passwords from browsers, login sessions, API tokens, and detailed records of visited URLs. When the collection is complete, the malware uploads everything to a remote channel -- often a public Telegram group. The YOULOGS MIX199pcs file is a direct output of this process: credentials that were actally entered or stored on real peoples' devices, stripped out without warning and shared publicly. The victims had no idea it was hapening.

Check If You Are Affected

HEROIC's free dark web scanner checks your email against more than 400 billion leaked records -- including stealer logs like YOULOGS MIX199pcs. If your credentials were exposed in this breach or any other, you will get an instant alert. Run your free check now at heroic.com before an attacker gets there first.