The CuckooLogs Stealer Log Put 6,877 Stolen Logins Online in June

HEROIC analysts found a stealer log titled CuckooLogsPublic, uploaded to a Telegram channel by a user going by LOGSYNC. The file is dated June 13, 2025, and contains 6,877 records, each made up of an email address, a plaintext password, and the URL of the account those credentials open.

Why the CuckooLogs Leak Is Dangerous

Every password in this file is stored in plaintext, meaning it can be read and reused immediately by anyone who opens the file. There is no encryption to break through and no guessing involved, just an email, a password, and the exact site it works on, all sitting together in one record.

What the CuckooLogsPublic File Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites those passwords unlock

Why This Matters

Even at under 7,000 records, this kind of leak carries real weight because of how people reuse passwords. Attackers routinely take small, fresh logs like this one and run them through credential stuffing tools that try each login against major banks, email providers, and retailers. A single reused password can turn into an account takeover, and from there, identity theft or financial fraud become possible.

How a Stealer Log Like This Gets Made

Files like CuckooLogsPublic are the output of infostealer malware, not the result of a company database being hacked. The malware infects a device, often through a pirated program, a fake software update, or a malicious link, then quietly copies saved passwords and browser session data. The person distributing the log, in this case someone using the name LOGSYNC, packages that stolen data and uploads it to a Telegram channel where anyone can grab it.

Check If You Are Affected

HEROIC's free breach scanner lets you check your email address against more than 400 billion leaked records, including logs like CuckooLogsPublic. If your information turns up, change the affected password right away and anywhere else you may have reused it.