The Bysources.com Leak Put 1,600 Business Logins on the Dark Web

HEROIC analysts found a stealer log tied to bysources.com that a Telegram user uploaded on 10 June 2026. The file contained 1,600 records, each one an email address paired with a plaintext password and the URL of the login page that password was captured on.

Why This Is Dangerous

This exposure did not come from a breach of bysources.com's own systems. It came from infostealer malware running on infected devices, quietly recording login details as people typed them in. Because the passwords in this file are stored in plaintext, an attacker can read every one of them instantly, with no cracking required. The URL tied to each record tells an attacker exactly which login page a stolen password belongs to.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs tied to each set of stolen credentials

Why This Matters

Business accounts often connect to email, banking, and vendor logins that share the same password, which raises the stakes for the 1,600 people in this file. Attackers take stolen credentials like these and test them against other sites through credential stuffing, hoping a password was reused. A successful match leads to account takeover, which can escalate into identity theft or financial fraud.

How Stealer Logs Work

Infostealer malware infects a device through a malicious download, phishing link, or infected attachment, then it silently copies saved passwords, autofill data, and session cookies from the browser. That stolen information is bundled into a log file and sent to the attacker, often within hours of infection. These logs then circulate on Telegram channels, which is how this bysources.com related file came to light.

Check If You Are Affected

If you have ever used bysources.com or reuse the same password across multiple accounts, it is worth checking whether your information appears in this exposure. HEROIC's free breach scanner searches more than 400 billion leaked records so you can confirm your exposure and change any affected password right away.