The 300 Uploaded by a Telegram User Leak Exposed 6,564 U.S. Accounts

HEROIC analysts identified a stealer log file uploaded to Telegram in August 2023 by an anonymous user. The file, referred to as "300 uploaded by a Telegram User," contained 6,564 records harvested from infected devices. The exposed data included email addresses, plaintext passwords, and URLs, all pulled directly from compromised endpoints by malware operating silently on victims' machines.

Why This Is Dangerous

Stealer logs are ready-made attack kits. Every record in this file represents a real person whose device was infected and whose credentials were quietly extracted without their knowledge. Because the passwords are stored in plaintext, anyone with this file can attempt logins immediately, without needing to crack anything. The inclusion of URLs tells attackers exactly which accounts to target first.

What Was Exposed

The following data types were found in this stealer log:

• Email addresses
• Plaintext passwords
• URLs (indicating which services were accessed on infected devices)

Why This Matters

When email addresses and plaintext passwords are combined with the specific URLs from infected sessions, the risk multiplies quickly. Attackers can use these credentials for credential stuffing attacks, trying the same email and password combination across dozens of popular services. Successful logins can lead to account takeovers on banking platforms, email providers, and social media. From there, identity theft and financial fraud become straightforward next steps. Many victims will not realize their accounts are compromised until real damage has already been done.

How Stealer Log Breaches Work

Stealer logs originate from malware infections, most commonly through phishing emails, malicious downloads, or compromised software. Once installed on a device, infostealer malware runs silently in the background, capturing everything the user types, including passwords, and recording which websites and services they visit. The collected data is packaged into log files and sent back to the attacker. These logs are then sold or shared across dark web forums and encrypted messaging platforms like Telegram. The "300 uploaded by a Telegram User" file is a direct example of this pipeline: malware harvested the data, and an anonymous actor distributed it through Telegram channels frequented by cybercriminals.

Check If You Are Affected

If your email address or any passwords you use appeared in this stealer log, your accounts may already be at risk. HEROIC's free breach scanner searches across more than 400 billion compromised records to tell you whether your data has surfaced in known breaches and leaks. Run a free scan now to find out where your information has been exposed and take steps to secure your accounts before attackers do.