The FB Stealer Log Breach Put 568 Stolen Email and Password Pairs Online in 2023

HEROIC analysts identified a stealer log file distributed on Telegram in August 2023 by an anonymous user operating under the name FB. The file contained 568 records extracted from compromised endpoint devices, with each entry including an email address, a plaintext password, and a URL identifying the specific website where those credentials were active. While smaller in volume than many stealer log releases, each of the 568 records represents a real person whose login information was silently harvested from their own device and then shared with anyone willing to download the file.

Why This Is Dangerous

Stealer log data does not require any additional work before it can be used. The passwords in this file are stored in plaintext, meaning they are fully readable without any technical tools. Combined with email addresses and the URLs of targeted sites, each record gives an attacker everything needed to attempt unauthorized access immediately. The specificity of the URLs eliminates trial and error, pointing attackers directly to the platforms where each victim's password was confirmed to work at the time of infection.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (websites and services where credentials were actively used)

Why This Matters

Even a smaller stealer log like this one carries serious consequences for the individuals affected. Plaintext credentials paired with email addresses are the foundation of credential stuffing attacks, where automated tools rapidly test login combinations across dozens of platforms. A single exposed record can lead to account takeover across email, banking, retail, and social media accounts if the victim uses the same password in multiple places. The included URLs provide additional context about which services each victim uses, making targeted attacks more efficient. Real-world outcomes include unauthorized financial transactions, hijacked accounts, and personal data used to commit identity theft.

How Stealer Logs Work

A stealer log is the product of infostealer malware running on a victim's device. Infostealers are distributed through a wide range of methods, including phishing emails with malicious attachments, fake downloads of popular software, and compromised websites that silently install code when visited. Once active, the malware scans the device for stored browser passwords, saved application credentials, authentication cookies, and autofill information. The collected data is packaged into a single file and sent to the attacker. Files like this one are then distributed through Telegram, where they can be accessed by a large network of cybercriminals at no cost and with minimal risk to the distributor. The infected user rarely knows anything happened until accounts begin showing unauthorized activity.

Check If You Are Affected

Even with 568 records, every person in this file faces a real risk of account compromise. HEROIC's free breach scanner searches across more than 400 billion exposed records, including stealer logs from Telegram and other underground distribution channels. Checking your email address takes only a few seconds and can reveal whether your credentials are circulating in criminal networks. Use HEROIC's scanner now to find out if your information was captured and take steps to secure your accounts before any further damage occurs.