3,003 Stolen Credentails Exposed in FB Telegram Log

HEROIC analysts identified a stealer log file uploaded to Telegram in August 2023 by an anonymous threat actor. The file contained 3,003 records harvested from infected devices, exposing a combination of email addresses, plaintext passwords, and URLs tied to real user sessions and accounts. Stealer logs like this one are not data that was stolen from a company server. Instead, they are the direct output of malware running silently on victims' own computers.

Why This Is Dangerous

Every record in this file is immediately actionable for a criminal. Plaintext passwords require no cracking, no guessing, and no technical skill to use. Combined with the email address and the URL showing exactly which site the password belongs to, an attacker has a ready-made login kit. They can log in to the victim's account within seconds of obtaining this data. Because most people reuse passwords across multiple services, a single record can unlock banking apps, email accounts, cloud storage, and social media profiles all at once.

What Was Exposed

• Email addresses
• Plaintext passwords (unencrypted, ready to use)
• URLs (identifying which services the credentials belong to)

Why This Matters

Stealer log data is among the most dangerous type of breach data in circulation because it bypasses every server-side security control. Even if a website stores passwords using strong encryption, stealer logs capture the password before it is ever sent to the server. This means breach notification systems, password reset flows, and two-factor authentication can all be rendered useless if the attacker also captures the session cookie stored in the browser. Victims of stealer log exposure face risks including account takeover, unauthorized financial transactions, identity theft, and being locked out of their own accounts after a criminal changes login credentials.

How Stealer Logs Work

A stealer log is the output file generated by a category of malware called an infostealer. Infostealers are typically delivered through phishing emails, malicious software downloads, fake browser extensions, or cracked software distributed on file-sharing sites. Once installed on a device, the malware silently scans the browser for saved passwords, session cookies, autofill data, and browsing history. It then packages all of that data into a structured log file and sends it to the attacker's server, or in this case, uploads it directly to a Telegram channel where other criminals can download it. The victim's device may show no signs of infection. Antivirus software does not always catch modern infostealers, and the entire process can complete in minutes before any alert is triggered.

Check If You Are Affected

HEROIC's free breach scanner searches across more than 400 billion records, including stealer log data like this Telegram upload from August 2023. If your email address appears in this dataset or thousands of others like it, you will know immediately. Enter your email at HEROIC to check your exposure status and take action before a criminal does.