ZIP files from unofficial or underground sources frequently contain malware, such as keyloggers or stealer logs, designed to infect the downloader's computer.
Check your active sessions in the MEGA settings to ensure only your devices are logged in. Login - MEGA
Using leaked credentials violates MEGA's Terms of Service and may involve legal issues related to unauthorized access to computer systems. How to Secure Your Own MEGA Account 4200 mega.nz accs by LB.zip
If you are concerned that your credentials might be in such a list, you should take the following steps:
Use a strong, unique password specifically for MEGA. ZIP files from unofficial or underground sources frequently
These lists are frequently used in automated "stuffing" attacks, where hackers test stolen username/password pairs across multiple sites to find working logins.
Files like this often circulate in communities that share "premium" account access for free. However, downloading or using these accounts can lead to severe security risks and account termination. Risks of Engaging with Such Files How to Secure Your Own MEGA Account If
This adds a critical second layer of security even if someone has your password.