The ArtHouse Combo Breach Happened Months Ago. 4.4 Million Records Just Went Public.

In March 2026, HEROIC analysts indexed part 29 of the ArtHouse Combo URL series -- a massive Telegram-distributed combolist that exposed 4,423,060 records in a single file. Each record contains an email address, a plaintext password, and the URL of the site it was associated with. The ArtHouse series is one of the larger ongoing credential distribution operations HEROIC tracks, with each individual part running into the millions of records. This single installment alone exposed more credentials than most breach events covered in security news.

Why the ArtHouse Combo URL Part 0029 Is Especially Dangerous

Four million credentials is not a niche dataset. It is a bulk weapon. At this scale, credential stuffing attacks become statistically very effective -- even with a modest success rate of one percent, over 44,000 accounts could be confirmed compromised from this file alone. The sheer size also means this data circulates widely. Files like ArtHouse Combo URL are downloaded by hundreds of operators across the attacker ecosystem, each running their own automated campaigns against different platforms. The more widely a credential file circulates, the more attempts each individual record faces across difrent platforms and time windows.

What the ArtHouse Combo URL Part 0029 Exposed

• Email addresses (4.4 million unique login identifiers)
• Plaintext passwords (fully readable, no hashing, no encoding)
• URLs (the specific websites each credential was associated with)

As a combolist -- rather than a traditional database dump -- ArtHouse Combo URL aggregates credentials from many different sources. The records in this file were not stolen from a single company. They were assembled from multiple stealer log captures, previous breach compilations, and other credential sources, making the affected user population very broad and the original source very difficult to trace.

Why This Matters: 4 Million Records Is a Mass-Scale Attack Resource

Combolists of this size are the primary fuel for large-scale automated credential stuffing campaigns. Attackers load files like ArtHouse Combo URL Part 0029 into tools like Sentry MBA, OpenBullet, or custom scripts and run them simultaneously against streaming platforms, banking apps, e-commerce sites, and email providers. Because the list is so large, victims may not notice unusual login attempts until significant damage has already been done -- accounts drained, emails compromised, identities stolen. The timeline between a combolist being uploaded to Telegram and the first wave of credential stuffing attacks is typically measured in hours, not days. The ArtHouse Combo URL series has been in circulation since before this March 2026 batch, meaning many of these credentials have been tested multiple times across multiple attack campaigns.

How ArtHouse Combo URL Stealer Logs Are Built and Distributed

The ArtHouse Combo URL series is a compiled combolist -- a large aggregation of credentials from multiple infostealer campaigns, database breaches, and previously leaked files. The operators behind it collect credential data from various sources, standardize the format into URL:Email:Password triplets, split the compiled file into numbered parts, and distribute each part through a Telegram channel. Part 0029 was uploaded on March 6, 2026, meaning parts 1 through 28 had already been in circulation before this installment. At an average of roughly 4 million records per part, the full series represents tens of millions of credential records in total. This is not a single malware campaign -- it is a professional-grade credential aggregation and distribution operation.

Check If You Were Part of the ArtHouse Combo URL Data Breach

HEROIC indexes over 400 billion compromised records, including the full ArtHouse Combo URL series and breach data from across the dark web and private Telegram channels. A free search on HEROIC will tell you whether your email address appeared in part 0029, any other ArtHouse installment, or any other known breach. No account is required. Given the scale of this series, checking your email is strongly recommended -- even users who have not been notified of a breach by any company may find their credentials in a combolist like this one.