How the 90_Boss2 Stealer Log Led to 4,455 Stolen Credentials

HEROIC analysts discovered 4,455 records exposed in the 90_Boss2 stealer log upload on August 23, 2023. A Telegram user distributed this stealer log file, leaking email addresses, plaintext passwords, and URLs harvested from compromised endpoints across the United States.

Why 90_Boss2 uploaded by a Telegram User Data Is Dangerous

Stealer logs are among the most actionable data types circulating in criminal marketplaces. Unlike data from traditional breaches, stealer logs capture credentials directly from infected devices at the moment of theft. The 90_Boss2 dataset includes plaintext passwords paired with working email addresses and the exact URLs where those credentials were used, giving attackers a ready-made list of targets with no additional cracking required.

What Was Exposed in the 90_Boss2 Telegram Breach

• Email addresses
• Plaintext passwords
• URLs (the specific sites where credentials were active)

Why the 90_Boss2 Stealer Log Leak Matters

When plaintext passwords are combined with email addresses and associated URLs, criminals have everything they need to take over accounts immediately. Victims face risks including credential stuffing attacks across dozens of services, full account takeover on banking, shopping, and email platforms, and identity theft if the compromised accounts hold personal or financial information. Because stealer logs are often shared across multiple criminal channels, the same credentials can be exploited by many different threat actors simultaneously.

How Stealer Log Breaches Work

A stealer log originates from malware installed on a victim's device, often through a malicious download, phishing email, or compromised software. Once running, the malware silently harvests saved passwords, browser session cookies, and login URLs from the infected machine. These records are then packaged into log files and sold or shared on Telegram channels and dark web forums. The 90_Boss2 file follows this exact pattern, with a Telegram user distributing the harvested credentials publicly in August 2023.

Check If Your Data Was Exposed

If you think your credentials may have been part of the 90_Boss2 stealer log or any other breach, you can find out right now. HEROIC's free breach scanner checks your email against more than 400 billion exposed records, one of the largest breach databases available to the public. Search your email address today to see if your passwords have been compromised and take action before attackers do.