How to check plugins for malicious code?

There are several options/plugins to do that but nothing can provide you with 100% security. Following good practices, daily/weekly backups and using themes/plugins that follow good code practices will usually help you to stay away of troubles. But again nothing will give you 100% security. As for plugins you can try several that will give you a little peace of mind:

I’ve worked mainly with Wordfence Security since most of the plugins I use come from the official WP repository and it has some neat settings that allow you to compare your theme’s/plugins’ code against changes directly with the theme’s/plugins’ repo and scan the code for potential issues.

But again this is not a 100% solution.

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