One Dark Web Upload. 508 Files. The fulpaking Log Had 35,458 Records.

What HEROIC Analysts Found in the fulpaking 508count Stealer Log

In July 2025, a Telegram user uploaded a stealer log archive labeled fulpaking 508count containing 35,458 records. HEROIC analysts confirmed the dataset includes plaintext passwords, email addresses, and URLs -- the output of infostealer malware that silently harvested credentials from victims' devices before packaging and uploading the data to a Telegram-controlled channel. With over 35,000 records, this is a notably large stealer log dump.

Why This Is Dangerous for Victims

At 35,458 records, this is not a small, targeted leak. This dataset represents a large cross-section of users whose devices were infected and whose credentials were quietly exfiltrated. Because the data includes URLs alongside plaintext passwords, attackers know exactly which accounts to target first -- banking portals, corporate email, cloud services, and social media platforms are all identifiable from the URL data. Credentials from a 2025 upload are very likely still active and valid, meaning the exploitation window is open right now.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs (specific services the victim was authenticated to)

Why This Matters: Credential Stuffing and Account Takeover at Scale

A stealer log of this size is highly valuable on dark web markets. Criminal operators run automated credential stuffing tools that test every email-password pair against banking platforms, e-commerce sites, and email providers simultaneously. When a match succeeds, the attacker drains the account or sells verified access. At scale, breaches like this one fuel widespread financial fraud, identity theft, and corporate network intrusions -- consequences that can follow victims for years after the initial data theft.

How Stealer Logs Work

Infostealer malware is distributed through phishing email campaigns, trojanized software packages, and malicious browser extensions. Once installed, the malware silently collects every saved browser credential, session cookie, and autofill entry on the device. It then compresses the data into a single archive and uploads it to a Telegram channel where buyers can access it immediately. The infected user sees nothing unusual during this process, and typically does not discover the compromise until accounts begin showing unauthorized access.

Check If You Are Affected

With 35,458 records in this single upload, the odds that someone you know was affected are significant. HEROIC's free breach scanner checks your email against over 400 billion exposed records -- giving you visibility into whether your data surfaced in this breach or any of the thousands of others tracked in the database.

Enter your email at HEROIC's free breach scanner to find out if your credentials are already circulating on the dark web.