Inside Mix Valids Stealer Logs: 1,351 Passwords Harvested

HEROIC identified a stealer log collection labeled "Mix Valids" circulating on Telegram in September 2024. This data set contains 1,351 compromised records harvested by infostealer malware, including plaintext passwords that leave affected users immediately vulnerable to account takeover.

Why Plaintext Passwords Are a Critical Threat

The credentials in the Mix Valids dump are stored in plaintext, meaning they require no decryption or cracking to exploit. An attacker who obtains this data can begin logging into victim accounts within seconds. This eliminates the usual time buffer that hashed passwords provide and makes rapid, automated attacks trivially easy to execute.

What Was Exposed

• Email Addresses — used as login identifiers and phishing targets
• Plaintext Passwords — ready for immediate unauthorized access
• URLs — revealing the exact services and sites where credentials were captured

Credential Stuffing and the Password Reuse Problem

Since the leaked URLs show exactly which services were compromised, attackers can target those accounts directly. But the greater danger is credential stuffing—automated tools that take each email-password pair and test it across hundreds of other websites. Anyone who reuses passwords across services is especially at risk, as a single leaked credential can unlock banking, social media, and email accounts simultaneously.

How Stealer Logs Capture Your Data

Stealer logs are generated by infostealer malware that silently infects a device, often through phishing emails, fake software downloads, or malicious ads. Once installed, the malware records every credential saved in browsers, autofill fields, and password managers. It then packages and exfiltrates this data to threat actors, who compile and trade it in bulk on platforms like Telegram. The Mix Valids dump is one such collection, representing harvested credentials from real infected devices.

Check If Your Credentials Were Exposed

If you suspect your information may be part of the Mix Valids leak, take action now. Use HEROIC's breach scanner to search across more than 400 billion compromised records. A quick scan can reveal whether your email or password has been exposed in this or any other known breach, so you can change affected credentials before they are exploited.