The Seznam.cz Stealer Log Could Give Hackers Account Access

HEROIC analysts identified this stealer log on April 7, 2023. The breach exposed 123,160 records, with stolen data including email addresses, plaintext passwords, and URLs. The source is identified as Seznam.cz.

Why This Is Dangerous

Seznam.cz is a major Czech internet portal offering email, search, and other online services. Plaintext passwords captured from users of this platform give attackers direct access to active email inboxes. A compromised email account can be used to reset passwords on other services, intercept messages, and impersonate the victim.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (website addresses where credentials were stolen)

Why This Matters

With over 123,000 credentials exposed, this breach puts Seznam.cz users at risk of account hijacking and identity theft. Criminals can access private email communications, use the email account as a pivot point to take over linked services, and exploit personal information for targeted phishing attacks. Czech internet users who use the same password across multiple platforms face the greatest risk.

How Stealer Logs Work

Stealer logs are files created by malware running on an infected device. The malware silently captures browser-saved passwords, session cookies, and credentials entered during login. Once collected, the data is sent to attackers who compile it into files and publish it on dark web forums and private Telegram channels for other criminals to use.

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.