The Brunel.ac.uk Leak Happened in June. It Surfaced Weeks Later.

HEROIC analysts found a stealer log tied to brunel.ac.uk that a Telegram user uploaded on 10 June 2026. The credentials inside had already been sitting with whoever ran the infostealer malware before this file became public. It contained 2,553 records, each one an email address paired with a plaintext password and the URL of the login page that password was used on.

Why This Is Dangerous

This data was not taken from a breach of the university's own network. It came from infostealer malware running on infected devices, quietly recording passwords as students and staff typed them into their browsers. Because the passwords in this file are stored in plaintext, an attacker can read every one of the 2,553 entries instantly, with no cracking required. The URL tied to each record shows 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

The gap between when data like this is first stolen and when it eventually becomes public means victims often have no idea their credentials are already circulating. Students and staff frequently reuse a university password across email, banking, and other personal accounts, so attackers take stolen credentials and test them against other sites through credential stuffing. 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 file, then it silently copies saved passwords, autofill data, and session cookies from the browser. That stolen information sits with the attacker until it is eventually packaged into a log file and shared or sold on Telegram, which is how this brunel.ac.uk related file came to light.

Check If You Are Affected

If you have a brunel.ac.uk account or reuse the same password across multiple sites, 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 find out and change any exposed password right away.