263 Files, One WATERCLOUD Dump: 15,504 Credentials Exposed

263 Files, One WATERCLOUD Dump: 15,504 Credentials Exposed

HEROIC analysts identified a stealer log file named "Upload_by_LOGSYNC_WATERCLOUD_NOTIFY_263_FILES_28_05_2025_THANKS" uploaded to a public Telegram channel, tied to a leak date of May 28, 2025. As the filename indicates, the upload bundled 263 individual log files into one archive, together containing 15,504 records that each pair an email address with a plaintext password and the URL of the account it was used on.

Why This Is Dangerous

Each of those 263 files represents a separate infected computer, meaning this single upload consolidates credentials stolen from hundreds of different victims in one place. Because the data was harvested directly from infected devices, it sits in plaintext with no encryption for an attacker to work around, so every one of the 15,504 credentials is ready to use immediately.

What Was Exposed in the WATERCLOUD Leak

• Email addresses
• Plaintext passwords
• URLs of the accounts and services accessed

Why This Matters

A consolidated file of 15,504 working login pairs is exactly the kind of data attackers load into automated credential stuffing tools, testing each combination against email providers, banks, and online retailers. Anyone in this leak who reused a password elsewhere faces the risk of account takeover, which can escalate into identity theft and financial fraud once an attacker gains control of a primary email account.

How Stealer Logs Work

A stealer log is produced by information-stealing malware that infects a device through a malicious download, a cracked application, or a phishing link, then quietly copies every password saved in the browser along with the site each one belongs to. Operators often collect logs from many separate infections, exactly as seen with the 263 files bundled here, before packaging everything into one upload and sharing it on a Telegram channel.

Check If You Are Affected

With 15,504 credentials from this leak now circulating, it is worth checking your own exposure. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, so you can confirm whether your credentials appear and change them before someone else uses them.