Inside Mix TXTVALID Stealer Logs: 5,695 Passwords Harvested

HEROIC analysts have cataloged a stealer log file distributed on Telegram under the label Mix TXTVALID. Uploaded on April 19, 2026, the dataset includes 5,695 records, each containing an email address, a plaintext password, and the URL of the service where the credential was captured. The "TXTVALID" designation suggests this file has been filtered to include only verified, working credentials, making it particularly valuable to attackers seeking high-success-rate login attempts.

Why Validated Plaintext Passwords Are Especially Dangerous

Plaintext passwords are already the most exploitable form of leaked credentials, but a validated set raises the threat level further. When credentials are marked as "valid," it typically means they have been tested against the target service and confirmed to work at the time of validation. This removes the guesswork that attackers normally face when working with large credential dumps.

With validated plaintext entries, attackers bypass two major obstacles at once: they do not need to crack any encryption, and they do not need to filter out stale or incorrect passwords. The 5,695 records in Mix TXTVALID represent a curated, ready-to-use toolkit for account takeover operations.

What Was Exposed in the Mix TXTVALID Dump

• Email Addresses — Verified email identifiers associated with active accounts, useful for both direct login attempts and spear-phishing campaigns.
• Plaintext Passwords — Unencrypted, human-readable passwords that were potentially validated against their target services before distribution.
• URLs — The specific endpoints where each credential was harvested, giving attackers precise instructions on where to deploy each login pair.

Why 5,695 Validated Records Fuel Automated Attacks

Credential stuffing tools are designed to process lists of email-password pairs against multiple services at high speed. When the input list is pre-validated, the success rate climbs dramatically compared to raw, unfiltered dumps. Attackers can prioritize high-value targets like email providers, financial institutions, and cloud platforms, knowing that many of these credentials are likely still active.

Password reuse compounds the problem. Even if a victim changed their password on the original service, the same credential may still work on other platforms where the user registered with the same email and password combination. This makes each validated entry in Mix TXTVALID a potential key to multiple accounts across the internet.

How Stealer Logs Are Built From Infected Machines

The technical pipeline behind stealer logs starts with infection. Infostealer malware families such as RedLine, Raccoon, and Vidar are distributed through malvertising, cracked software bundles, and phishing lures. Upon execution, the malware queries browser databases (typically SQLite files stored in user profile directories) to extract saved credentials, cookies, and autofill data.

The extracted data is structured into log files — typically organized by URL, username, and password — and exfiltrated to command-and-control infrastructure. Operators then compile, deduplicate, and sometimes validate the logs before distributing them on Telegram or selling them on cybercrime marketplaces. The Mix TXTVALID file represents the final stage of this pipeline: a processed, filtered, and ready-to-exploit credential set.

Check If Your Credentials Appear in This Leak

Discovering whether your data is in this dump is straightforward. HEROIC's free breach scanner indexes more than 400 billion compromised records, drawing from thousands of breach datasets and stealer log collections. Enter your email address to see if your credentials have been exposed in Mix TXTVALID or any other known leak.

If your information is found, act immediately. Replace the compromised password with a strong, unique credential and activate two-factor authentication on every account that supports it. For maximum protection, adopt a password manager to generate and store unique passwords for each service, eliminating the reuse that makes credential stuffing attacks so effective.