dfo-mpo.gc.ca Breach: What Hackers Can Do With 4,212 Passwords

What HEROIC Analysts Found

In June 2026, HEROIC analysts found a stealer log posted to a Telegram channel containing 4,212 records tied to dfo-mpo.gc.ca, the Canadian government domain used by Fisheries and Oceans Canada. The file contained email addresses, plaintext passwords, and the login URLs those passwords open. The data was not stolen from a company database. It was pulled from individual infected devices and repackaged into one file for anyone to download.

What an Attacker Can Do With This Data

With an email, a plaintext password, and the exact URL it unlocks all in one place, an attacker doesn't need to guess or crack anything. They can log directly into the account tied to a .gc.ca address, then use that access to look for more sensitive information, request password resets on other linked services, or simply sell the working login to someone else. Because the password is stored as plain text rather than an encrypted hash, there is no extra barrier slowing an attacker down.

What Was Exposed

• Email addresses
• Plaintext (unencrypted) passwords
• Login URLs tied to each set of credentials

Why This Matters

Government and institutional email addresses are attractive targets because they often act as a single point of trust across many other systems. If someone at dfo-mpo.gc.ca reused this password anywhere else, they are exposed to credential stuffing attacks that test the same login across dozens of other sites. A compromised inbox can also be used to intercept password reset emails for other accounts, turning one leaked credential into a much wider account takeover.

How Stealer Logs End Up on Telegram

This type of leak comes from infostealer malware, a category of malicious software designed to quietly harvest saved browser passwords, autofill data, and session cookies from an infected device. Once collected, the stolen data is compiled into a "log" and uploaded to Telegram channels, often for free, to build reputation before larger paid logs are sold. Other actors then combine these logs into searchable collections, making it easy to pull out every credential connected to a specific domain like dfo-mpo.gc.ca.

Check If You Are Affected

If you or someone you know uses a dfo-mpo.gc.ca account, it is worth checking whether those credentials appear in this leak. HEROIC's free breach scanner searches a database of more than 400 billion exposed records, including stealer logs like this one, so you can find out in seconds and change any reused passwords before someone else logs in first.