The Vidar ArhontCorp Stealer Log Exposed 30,688 Stolen Logins

In August 2026, HEROIC analysts spotted a stealer log file labeled "Vidar Private 1" being shared by a Telegram user under the handle ArhontCorp. The file held 30,688 records harvested by Vidar, a well-known password-stealing malware, and included email addresses, plaintext passwords, and the URLs of the websites those logins belonged to. Unlike a breach at a single company, this data was pulled directly off infected victims' own computers.

Why a Malware-Harvested Log Is So Dangerous

Stealer logs are different from a typical company data breach because the malware doesn't just grab one password, it grabs everything saved in the victim's browser at the moment of infection. That means the accounts inside this file were very likely still active and in current use when Vidar captured them, unlike old breach data that may already be stale. Each record also comes with the exact site URL attached, so an attacker can log straight into that account without any guesswork.

What Was Inside the Vidar ArhontCorp Log

• Email addresses tied to infected devices
• Plaintext passwords saved in the victim's browser
• URLs showing exactly which site each login belonged to

Why This Matters for Everyday Accounts

Because these credentials were lifted straight from a real, working browser session, they're far more likely to still be valid than passwords from an old, already-patched breach. Criminals use logs like this for credential stuffing, account takeover, and identity theft, testing each email and password pair against banking sites, email providers, and shopping accounts. If any of the passwords in this file are reused elsewhere, an attacker could quietly unlock several accounts at once using a single stolen login.

How Vidar Stealer Logs Get Made

Vidar is malware that infects a device, often through a fake download, cracked software, or malicious email attachment, and then quietly copies saved passwords, autofill data, and browser session details before sending everything back to the attacker. The stolen data is packaged into a "log" file per victim, and criminals like the one operating under the ArhontCorp Telegram handle collect, organize, and redistribute these logs, sometimes selling private access to buyers on Telegram or dark web marketplaces.

Check If Your Login Was Caught in a Stealer Log

If your device was ever infected by info-stealing malware like Vidar, your saved passwords could already be circulating in logs like this one. HEROIC's free dark web breach scanner checks your email against more than 400 billion leaked records, including stealer logs, so you can find out and change any exposed passwords right away.