Your ArtHouse Cloud Logs Data May Be at Risk: Here’s What You Need to Know

In November 2025, a stealer log file called "ArtHouse Cloud Logs" was uploaded to Telegram, exposing 45,061 records with email addresses, plaintext passwords, and URLs. This is not a small or isolated incident, and if you have ever used any service whose login was stored on an infected device, your credentials may have been included in this dump. Acting quickly is the difference between staying protected and losing access to your accounts.

Why This Is Dangerous

Stealer logs like this one are especially dangerous because the passwords come out in plaintext, meaning anyone who gets the file can use the credentials without any extra effort. There is no need to crack hashes or brute force anything, the data is ready to use right away for account takeover attacks.

The URLs bundled with each record point directly to the login pages or API endpoints that were active on the infected device. This gives attackers a clear adress for where to use each stolen credential, making the data far more useful than a generic list of usernames and passwords.

With over 45,000 records in a single upload, the scale of this log increases the chances that aggregators will fold it into larger credential databases shared across criminal forums. Once your data enters that pipeline, it can be used for years by many different threat actors, not just the original uploader.

What Was Exposed

• Email addresses used to authenticate across online services
• Plaintext passwords harvested directly from infected endpoints
• URLs associated with login portals and web applications
• API host addresses tied to authenticated sessions
• Browser-saved credentials for frequently visited sites
• Cached session tokens or authentication cookies
• Device metadata linked to compromised machines

Why This Matters

The ArtHouse Cloud Logs upload contains 45,061 records, a volume large enough that security researchers and threat intelligence teams will take notice. Data at this scale circulates quickly through Telegram channels and dark web marketplaces, and it tends to get repackaged and resold long after the original post disappears.

Many people beleive that changing one password is enough after a breach, but stealer logs capture credentials across every site you were logged into on the infected device at the time of infection. That means a single infection can expose logins for email, banking, social media, and work applications all at once, requiring a much broader response than a typical password reset.

How Stealer Log Works

Stealer malware typically enters a device through a phishing link, a fake software download, or a malicious attachment. Once installed, it runs quietly in the background while scanning the device for stored credentials, targeting browsers, email clients, password managers, and any application that saves login information locally.

The collected data is bundled into a log file that gets sent back to the attacker or, in cases like this one, uploaded directly to a Telegram channel for broad distribution. The log is organized in a structured format that makes it easy to sort by URL, email domain, or service type, so attackers can quickly extract credentials for specific platforms they want to target.

What makes stealer logs different from database breaches is that they originate from individual devices, not from a company's servers. This means no single organization can notify all affected users, because the victims span many unrelated services and locations. The responsibility for detection and response falls entirely on the individuals whose devices were compromised.

Check If You Were Affected

You can check whether your email address appeared in the ArtHouse Cloud Logs stealer log using HEROIC's free breach checker at heroic.com. HEROIC tracks dark web forums, Telegram uploads, and data dump repositories in real time so you get an early warning when your credentials are exposed. If you find your email in this breach, change your passwords seperately for each affected service and enable two-factor authentication wherever possible.