Researchers Tied the 477 PCS Free Logs to 4,225 Stolen Credentials

Analysts reviewing dark web Telegram channels in October 2023 identified a publicly posted stealer log file carrying credentials from 477 compromised machines. The dump, labeled 477 PCS - 10.15.23 - FREE LOGS, was uploaded on October 15, 2023 by an anonymous Telegram user and contained 4,225 records of endpoint data. The label itself is revealing: PCS refers to the number of infected computers (477 personal computers), and FREE LOGS signals the data was distributed at no cost -- broadcast openly to maximize reach and exploitation potential. Each record contained email addresses, plaintext passwords, and URLs associated with sessions captured on those machines at the time of infection.

Why This Is Dangerous

The deliberate free distribution of this data on Telegram is a red flag that separates this dump from ordinary credential leaks. When stolen logs are shared for free, they are typically used to build a threat actor's reputation, flood the credential stuffing ecosystem with fresh data, or attract buyers for higher-value future dumps. With 4,225 matching email and password pairs available to anyone who downloaded the file, the window for account takeover began the moment the upload went live. The URL data further tells attackers which platforms each victim was actively using, enabling targeted attacks against specific services rather than broad automated sprays.

What Was Exposed in the 477 PCS Free Logs Dump

• Email addresses
• Plaintext passwords (no encryption, immediately actionable)
• URLs and active session endpoints from compromised machines

Why This Matters

Even a dataset of 4,225 records can cause significant real-world damage. Each credential pair represents a real person's login -- and if that person reuses their password across other services, a single stolen record can unlock multiple accounts. Credential stuffing attacks, phishing follow-ups, and identity fraud all become possible the moment plaintext passwords are in the wild. The free distribution model also means this data circulated widely and quickly, potentially reaching hundreds of threat actors within hours of the initial Telegram post. For victims who have not changed their passwords, these credentials may still be active and exposeable today.

How Stealer Logs Work

Stealer logs are produced when infostealer malware successfully infects an endpoint. The malware -- often delivered through phishing links, trojanized software, or malvertising -- runs silently and systematically harvests saved browser passwords, session cookies, keystrokes, and form data. This information is then compiled into a structured log file tied to the infected machine. In the case of the 477 PCS dump, logs from 477 distinct infected machines were collected, sorted, and packaged together into a single file before being uploaded to Telegram. The free sharing model is common among emerging threat actors looking to establish credibility in criminal communites, where reputation is currency.

Check If You Are Affected

If your device was infected by infostealer malware in October 2023, your credentials may be in the 477 PCS Free Logs dump or similar datasets. HEROIC's free dark web scanner checks your email against a database of 400 billion+ compromised records -- including free-distributed stealer logs, breach databases, and dark web credential markets. Run a free scan now to find out if your data has been exposed.