Your Login May Be Exposed: CuckooLogsPublic Leak Hits 4,717

HEROIC analysts found a stealer log file named "CuckooLogsPublic-20250526," uploaded to a Telegram channel by a group calling itself LOGSYNC on May 26, 2025. The file contained 4,717 records tied to United States based accounts, including email addresses, plaintext passwords, and the URLs of the login pages those credentials belonged to.

Why This Is Dangerous

Your login may already be exposed without any warning, and this leak is exactly why. The file's name suggests it originated from the Cuckoo infostealer, malware built to quietly harvest saved credentials from an infected device. The passwords inside are stored in plaintext, meaning there is no encryption standing between an attacker and a working login, and the matching URL for each account tells an attacker exactly where to try it.

What Was Exposed in the CuckooLogsPublic Leak

• Email addresses
• Plaintext passwords
• URLs of the associated login accounts

Why This Matters for the 4,717 Affected Accounts

An email, password, and login URL bundled together gives an attacker everything needed to attempt account takeover with no guesswork. If anyone among these 4,717 accounts reused their password elsewhere, the same combination can be tested against banking, email, and shopping sites within minutes through automated credential stuffing tools. From there, the risk extends into identity theft and financial fraud, since a compromised email account is often the key to resetting passwords on everything else tied to it.

How the Cuckoo Stealer Harvests Credentials

Stealer malware like Cuckoo infects a device, often through a pirated download or malicious attachment, and then quietly scans for saved credentials in web browsers, autofill data, and active session tokens. Once collected, the malware sends everything back to the attacker, who compiles it into a labeled file, such as the "CuckooLogsPublic" naming seen here, and posts it to Telegram channels or dark web forums. Because the theft happens on the victim's own device rather than through a breach of a company's servers, a single stealer log can expose credentials for dozens of unrelated sites at once.

Check If You Are Affected

If you are based in the United States, or think your device may have been infected by stealer malware around late May 2025, checking your exposure now is worth doing. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including stealer log dumps like this one, to tell you whether your email address has surfaced in a known breach. If it has, change the affected password immediately, along with any other account where you reused it.