The ‘fb4’ Stealer Log Exposed 8,534 Email and Password Pairs

In April 2024, HEROIC analysts identified a stealer log named "fb4" uploaded to a Telegram channel, containing 8,534 records of email addresses, plaintext passwords, and browser URLs. The short file name does not correspond to any verified company or platform, so we are treating it strictly as an unlabeled stealer log rather than attributing it to a specific service. Why This Is Dangerous: With 8,534 credential pairs stored in plaintext, this file gives attackers a large, ready-to-use list. There is no cracking or guessing required, only the willingness to test each login. What Was Exposed: The leak includes email addresses, plaintext passwords, and the URLs those passwords are tied to, giving attackers a clear starting point for each account. Why This Matters: A leak of this size represents thousands of people whose credentials are now circulating on Telegram. If any of them reused a password on another site, that single stolen login could open the door to their email, banking, or shopping accounts elsewhere. How a Stealer Log Like This Works: Stealer logs come from malware that infects a device, commonly through pirated software, cracked games, or malicious attachments disguised as legitimate files. Once active, the malware copies saved browser passwords, autofill entries, and session data, then sends everything back to the attacker. The stolen data is compiled into a file, in this case named "fb4," and shared or sold within Telegram channels used by cybercriminals. Check If You Are Affected: HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including stealer logs like this one. Run a scan to see if your credentials appear in this leak.