Inside WaterCloud: 12,850 Plaintext Passwords Exposed

Inside WaterCloud: What One Piece of a Stealer Log Reveals

HEROIC analysts identified a stealer log labeled WATERCLOUD_NOTIFY 0271 PIECE 12.06.2025, uploaded to a public Telegram channel on June 12, 2025. This single piece of the larger WaterCloud release contains 12,850 records, each pairing an email address with a plaintext password and the URL it unlocks.

Why This Is Dangerous

The label "PIECE" is telling: large stealer log operations are often broken into numbered chunks, like piece 0271 here, and released in batches. Each chunk is just as usable as the whole, meaning this smaller file still hands over 12,850 working logins.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs showing which site or service each login belongs to

Why This Matters

Being part of a numbered piece rather than a single standalone leak does not reduce the risk. The credentials work exactly the same way, and a reused password caught here can still be tried against your email, banking, or shopping accounts.

How WaterCloud-Style Releases Are Structured

Operators behind large stealer log collections often split their output into numbered pieces, distributing them gradually to keep interest and demand high on Telegram. Each piece, including this one, is generated the same way: infostealer malware harvests saved browser credentials from infected devices, which are then packaged and released.

Check If You Are Affected

Use HEROIC's free breach scanner to check your email against this leak and more than 400 billion other exposed records. A match means it is time to change that password everywhere you have used it.