Search Your Email: The ArtHouse Cloud Logs Dump Exposed 37,788 Accounts

On September 21, 2025, HEROIC analysts identified a stealer log file posted to a public Telegram channel by a user operating under the ArtHouse handle. This upload, which predates the versioned ArtHouse log files published later that month, contained 37,788 records, making it the largest single dataset in the ArtHouse Telegram log series. Each record included a plaintext password, an email address, and the URL of the API host or web service the victim was connected to at the moment their machine was compromised. The early date of this upload suggests it may represent the initial harvesting run that later spawned the versioned v1, v2, and v3 files, placing this dataset at the root of a sustained credential exfiltration campain.

Why This Is Dangerous

Nearly 38,000 records of live plaintext credentials constitute a ready-made weapon for account takeover operations. Attackers who obtained this file on or after September 21, 2025 could immediately begin running these credentials against email providers, banking portals, corporate VPNs, and cloud platforms. The API host URLs attached to each record give attackers specific intelligence about which services each victim was actively using, allowing them to prioritize high-value targets. Automated credential stuffing tools can process tens of thousands of login attempts per hour, meaning the window between publication and exploitation is measured in minutes, not days. Individuals and organizations whose credentials appear in this file may have already experienced unauthorised account access without knowing it.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs (API host endpoints active at time of malware infection)

Why This Matters

At 37,788 records, this dataset is large enough to fuel a significant credential stuffing campaign against multiple industries simultaneously. The presence of API host URLs is a key detail that elevates this beyond a simple credential dump. These URLs suggest that some of the compromised users were developers, IT administrators, or enterprise employees accessing backend systems, not just consumers browsing retail sites. If any of those API credentials belong to business systems, the downstream risk includes unauthorized access to corporate data, customer records, financial accounts, and proprietary software platforms. Identity theft, fraudulent transactions, and unauthorised data exfiltration are all realistic outcomes for victims whose records appear in this file. The combination of plaintext passwords and service-specific URLs makes this one of the more actionable ArtHouse datasets from the September 2025 period.

How Stealer Log Breaches Work

Stealer malware functions as a silent credential vacuum running on an infected machine. It typically enters through phishing attachments, malicious software bundles, fake update prompts, or drive-by downloads from compromised websites. Once active, it systematically extracts saved passwords from browsers, captures session tokens, records keystrokes during active logins, and harvests any credential data stored in configuration files. The resulting log file is a structured snapshot of everything the malware found on that machine at the time of infection. The ArtHouse operator collected these logs and published them to Telegram, where they became immediately accesible to anyone monitoring that channel. The September 21, 2025 upload date for this 37,788-record file places it at the start of a multi-week publishing window that produced at least three subsequent versioned releases from the same source.

Check If You Are Affected

Search your email address now. The ArtHouse Cloud Logs dataset published September 21, 2025 exposed 37,788 accounts, and those records are in active circulation among threat actors. HEROIC maintains a searchable database of over 400 billion exposed records compiled from data breaches, stealer logs, and underground forum leaks worldwide. Visit heroic.com to check whether your email address appears in this or any other known breach. If it does, change the associated password immediately on every service where you have used it, do not reuse that password, and enable two-factor authentication on your most sensitive accounts. Do not wait to see if you receive a breach notification. Check now.