How the mpgood Stealer Log Malware Led to 1,833 Stolen Logins

In October 2025, HEROIC analysts uncovered a stealer log file posted to Telegram under the name "mpgood." The file contained 1,833 records, each tied to an account that was comprimised by infostealer malware running silently on a victim's device. Every record included an email address, a plaintext password, and the URL of the service where the credential was captured, giving attackers immediate access to verified, ready-to-use login pairs.

How mpgood Infostealer Malware Led to 1,833 Stolen Logins

The mpgood stealer log is a direct product of infostealer malware infection. When this type of malware runs on a device, it does not just grab one password. It scans every browser profile, saved form, and local credential store it can find. The result is a comprehensive list of login pairs tied to real URLs, meaning each stolen credential is verified: it was actively in use on a real account when it was taken.

The 1,833 records in this file were then packaged and uploaded to Telegram, where they became available to any number of downloaders in private cybercrime channels. Each downloader now has direct access to working logins across the services listed in the URL column.

What the mpgood Stealer Log Exposed

• Email addresses used as account identifiers
• Plaintext passwords captured live from infected devices
• URLs revealing the exact websites and services that were targeted

Why Stealer Log Credentials Lead Directly to Account Takeover

Most data breach files require attackers to crack hashed passwords before they can be used. Stealer log files like mpgood skip that step entirely. The passwords are already in plaintext, copied directly from the victim's browser or app at the moment of infection. This means anyone with the file can attempt a login immediately, with no technical skill required.

The URL data compounds the risk. Attackers do not need to guess which sites to try. They already know the exact service each password belongs to, enabling fast, targeted account takeovers on banking platforms, email providers, shopping sites, and anywhere else the victim had saved credentials. Identity theft and financial fraud can follow quickly once an email account is accessed and password resets begin.

How the mpgood Stealer Log File Was Created and Distributed

Infostealer malware typically reaches victims through phishing emails, fake software installers, or malicious browser extensions. Once installed, it runs in the background without any visible signs of infection. It collects saved passwords, session tokens, and browsing history before transmitting everything to the attacker as a structured log file.

Those log files are then named, sorted, and distributed on dark web forums or Telegram channels. The mpgood file is one such package: a clean, organized output from an infostealer campaign, uploaded by a Telegram user and seperated from any connection to the original attacker. The victims whose data appears in it may have no idea their credentials are circulating online.

Check If Your Credentials Appear in the mpgood Dump

HEROIC's free breach scanner covers over 400 billion records from known data breaches, stealer logs, and dark web leaks. The mpgood file is part of that index.

Enter your email address at HEROIC to find out if your login information appears in this file. If it does, change the affected password immediately on that service and every other account where you have used the same password. Enabling two-factor authentication adds a critical second layer of protection against account takeover.