Researchers Linked the Boss Bez Telegram Stealer Log to 6,095 Stolen Credentials and API Endpoints

HEROIC analysts identified and verified a stealer log file posted to Telegram on November 3, 2023, exposing 6,095 records associated with the dataset labeled "Boss Bez." The file contained email addresses, plaintext passwords, and URLs, all consistent with credentials harvested by information-stealing malware from compromised machines. The data was uploaded publicly to a Telegram channel, where it became available to any threat actor monitoring that channel for fresh credential dumps. The presence of plaintext passwords means attackers can exploit these credentials with no additional processing required.

Why Plaintext Business Credentials Are Immediately Dangerous

When passwords are stored and leaked in plaintext, there is zero barrier between the attacker and the account. No cracking tools, no rainbow tables, no waiting. An attacker who obtains this file can begin testing credentials against email providers, cloud platforms, business applications, and banking services within seconds. The Boss Bez dataset also included URLs, which gives attackers direct targets: they know exactly which services to test those credentials against. This removes the guesswork from credential stuffing and makes targeted account takeover attacks fast and scalable. Financial fraud and business email compromise are likely downstream outcomes when business-associated credentials are exposed this way.

What Was Exposed in the Boss Bez Stealer Log

• Email addresses
• Plaintext passwords
• URLs

A total of 6,095 records were included in the file. The dataset was posted on November 3, 2023 to a Telegram channel used for distributing stolen credential files. The combination of email, password, and URL triples is a hallmark of stealer log output, where the malware captures not just credentials but the exact pages those credentials were last used on.

Why Stealer Log Breaches Fuel Identity Theft and Account Fraud

Stealer log datasets like Boss Bez are immediately ingested by credential stuffing networks. Automated bots test each email-password pair across dozens of platforms, looking for reused passwords that open more valueable accounts. When a match is found, attackers gain access to the target account, change recovery information to lock out the legitimate user, and begin extracting value: draining stored payment methods, sending phishing emails to the victim's contacts, or selling access to the account on dark web marketplaces. Identity theft often begins this way, with a single leaked credential opening a chain of account compromises the victim may not discover for weeks or months.

How Stealer Log Files End Up on Telegram

Stealer malware is designed to run silently on a victim's machine after being installed through phishing, cracked software, or malicious browser extensions. It harvests saved passwords, browser cookies, autofill entries, and application credentials, then packages them into a structured log file. That file is automaticaly transmitted to a remote server or directly to a Telegram bot controlled by the attacker. Telegram has become the preferred distribution channel for these logs because it is easy to use, hard to take down, and provides built-in search functionality that makes logs discoverable to buyers. The Boss Bez file followed this exact pattern, appearing on a known credential-sharing channel within hours of collection.

Find Out If Your Credentials Appeared in the Boss Bez Leak

HEROIC's breach intelligence database indexes over 400 billion records, including stealer logs, combolists, and database dumps sourced from Telegram channels, hacking forums, and dark web marketplaces. You can search your email address for free using HEROIC's breach scanner to check whether your credentials appeared in the Boss Bez upload or any other known breach. If your data is found, change the affected passwords immediatly, revoke access for any connected applications, and enable two-factor authentication on all accounts that share those credentials.