The CuckooLogsPublic Stealer Data Quietly Appeared on Telegram

HEROIC analysts noticed a small, unremarkable looking file appear on a public Telegram channel on June 6, 2025. Named CuckooLogsPublic, it drew no headlines and no fanfare, just 5,689 records quietly sitting in a channel anyone could join. Each record pairs an email address with a plaintext password and the URL of the site that login unlocks.

Why This Is Dangerous

Small and quiet does not mean low risk. The passwords in this file are stored in plain, readable text, so there is nothing for an attacker to crack or guess. Anyone who downloads the file can start trying logins the moment they open it, and because the leak never made news, most of the people in it likely have no idea their information is exposed.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs tied to each login

Why This Matters

A quiet leak is often more dangerous than a loud one, because no one is watching for it. Attackers use exactly this kind of overlooked data in credential stuffing attacks, feeding email and password pairs into automated tools that test them against banks, email providers, and shopping sites. Anywhere a password was reused, an account takeover becomes possible, followed closely by identity theft or fraud.

How Stealer Logs Work

CuckooLogsPublic is a stealer log, meaning it was produced by infostealer malware sitting quietly on an infected device rather than by a break in at a company. The malware usually gets in through a pirated download, a fake browser update, or a phishing attachment, then silently copies saved passwords, autofill entries, and browser cookies before sending them off to the attacker. Small, quiet uploads like this one are common on Telegram, often shared for free to build a following before bigger dumps go up for sale.

Check If You Are Affected

Because leaks like this rarely make the news, checking on your own is the only reliable way to know if you were caught up in one. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, so you can quietly confirm your own status and change any exposed password before someone else finds it first.