The poczta.fm Stealer Log Data Quietly Appeared on the Dark Web

HEROIC analysts identified this stealer log on 02-Jun-2026. The breach exposed 7,569 records, with stolen data including email addresses, plaintext passwords, and URLs. The source is identified as poczta.fm.

Why This Is Dangerous

poczta.fm is a Polish email service provider, meaning this file targets a specific national audience. The 7,569 credentials in this file are all associated with poczta.fm email accounts. Polish-language email accounts are used across a range of financial, government, and subscription services, and a stolen inbox gives a hacker the ability to reset passwords and access those services without the victim's knowledge.

What Was Exposed

• Email addresses (poczta.fm accounts)
• Plaintext passwords
• URLs (websites where credentials were used)

Why This Matters

Files like this one appear on dark web channels with little notice, often reaching thousands of criminal actors before the affected users have any awareness. Once a poczta.fm login is in criminal hands, the attacker can access the inbox, trigger password resets on linked services, and use any personal information found there for identity fraud. The 7,569 affected users range across Poland and the broader Polish-speaking online community.

How a Stealer Log Works

Stealer malware spreads through phishing emails, malicious software installers, and fake browser extensions. Once installed on a Polish-language device, it captures login credentials from the browser and active sessions, including poczta.fm webmail access. The collected data is assembled into a file and quietly shared through Telegram channels and dark web forums.

Check If You Are Affected

HEROIC offers a free breach scanner that searches 400 billion records. Search your email address now to see if your credentials appear here or elsewhere. Free, takes seconds.