ArtHouse Cloud Logs v1 Contains Exactly 2,979 Email and Password Pairs

On September 27, 2025, HEROIC analysts confirmed a stealer log file uploaded to a public Telegram channel under the ArtHouse handle, designated as Cloud Logs v1. The dataset contained exactly 2,979 records, each representing a distinct compromised endpoint. This first installment of the ArtHouse log series established the pattern that would continue across subsequent versions: email addresses captured alongside plaintext passwords and the specific API host URLs that were active on the victims' machines at the moment of infection. The precission of the data, pairing each credential set to a named endpoint URL, is what makes this dataset particularly useful to attackers and particularly dangerous for the people whose data it contains.

Why This Is Dangerous

ArtHouse Cloud Logs v1 is dangerous because it is specific. This is not a dump of hashed passwords that require hours of cracking. Every password in this file is in plaintext, meaning it can be used immediately. Every record also includes the URL of the service or API host the victim was accessing, which gives attackers a roadmap. They know which services to target, they have the credentials, and they have the email addresses needed to initiate account recovery flows if a password has already been changed. A file like this can drive account takeover campaigns, business email compromise attempts, and corporate network intrusions, all originating from 2,979 credential sets harvested quietly from real users' machines.

What Was Exposed

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

Why This Matters

The v1 designation suggests this was the origional dataset in what became a series of ArtHouse uploads, meaning the 2,979 records here were the foundation for subsequent credential harvesting runs. Credential stuffing attacks powered by stealer log data are among the most effective forms of account takeover because the passwords are real, recently captured, and often still valid. Victims whose credentials appear in this file are at risk of identity theft if attackers gain access to email accounts and then pivot to financial accounts, healthcare portals, and government services using password reset flows. For victims who used the same password across multiple services, a single record in this file can unlock many accounts simultaneously. Financial fraud, unauthorized purchases, and unauthorized wire transfers are documented consequences of credential stuffing attacks fed by exactly this type of data.

How Stealer Log Breaches Work

Stealer malware is purpose-built to harvest credentials without alerting the user. It typically infiltrates a machine through phishing lures, trojanized pirated software, or malicious browser extensions. Once running, it accesses the browser's local credential store, captures active session data, logs keystrokes during login events, and compiles everything into a structured log file. That file is then sent to the operator, in this case published to a Telegram channel, where it becomes available to anyone following that channel. The v1 designation on this ArtHouse log file suggests it was the first in a planned series, indicating the threat actor behind it was methodical and intended to continue publishing harvested credentials over time. Once a file is posted to a public Telegram channel, it cannot be recalled. It is downloaded, copied, and redistributed across dark web forums within hours.

Check If You Are Affected

ArtHouse Cloud Logs v1 contains 2,979 unique email and password combinations that are already in circulation. If your email address is in this file, attackers may have tested your credentials against dozens of platforms already. HEROIC indexes data from over 400 billion exposed records, including stealer logs distributed via Telegram, and you can search your email address right now at heroic.com to see if your credentials have been compromised. If you find your email in any breach database, treat it as a serious warning: change that password everywhere you have used it, and enable two-factor authentication on all accounts tied to that email address.