ArtHouse Cloud v1 Breach Exposes 40,746 Cloud User Records

In February 2026, HEROIC analysts identified a stealer log file labeled ArtHouse Cloud v1 circulating on a Telegram channel. The file contained 40,746 individual records harvested directly from infected computers, including saved login pages, email addresses, and plaintext passwords. Unlike a typical corporate breach, this data was not stolen from one company's servers. It was pulled straight off the victims' own devices by malware that had already recieved deep access to their browsers.

Why the ArtHouse Cloud v1 Leak Is Dangerous

Stealer logs are considered some of the most dangerous data on the dark web because they hand attackers a ready made key ring. Instead of guessing which website a password belongs to, criminals get the exact URL, the exact email, and the exact password bundled together. That means no cracking, no guessing, just direct access.

With 40,746 of these bundles in a single file, an attacker can automate logins across banking portals, email providers, and cloud storage accounts in minutes.

What Was Exposed in the ArtHouse Cloud v1 Files

• Email addresses
• Plaintext passwords
• Saved login URLs

Why This Matters for Everyday Users

Once this kind of data is circulating, it feeds directly into credential stuffing attacks, where bots test the same email and password combination on dozens of other sites. If a victim reused that password anywhere else, their whole digital life can be at risk, from social media to online banking.

This is also how account takeover and identity theft usually begin. A single reused password can seperate a person from their email, their finances, and their personal photos in the span of an afternoon.

How Stealer Malware Like This Works

Stealer malware is usually disguised as a cracked game, a free tool, or a fake software update. Once installed, it quietly scans the victim's browser for saved passwords, autofill data, and session cookies, then packages everything into a log file. That log is uploaded to a server the attacker controls, and eventually sold or leaked, like it occured here, on Telegram channels for free or for a small fee.

Check If You Are Affected

You do not need to know if your data was part of the ArtHouse Cloud v1 leak to take action. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including this one, so you can find out in seconds. If you are affected, changing your passwords and turning on multi factor authentication right away is the best next step.