Removing Malware From Site

First, take a quick deep breath and have a coffee, check it out here: https://ww.wp.xz.cn/documentation/article/faq-my-site-was-hacked/

You can restore the access with the help of your hoster. Here is an article that describes how to reset a user password via the database: https://ww.wp.xz.cn/documentation/article/reset-your-password/#through-phpmyadmin

Note: if the site is actually hacked, no data on it can be trusted. You should then re-create the website with a clean backup. Your hoster can surely help you with that.

I can’t find a plugin with that name. Unless you mean one with a similar name, but that has not been available in the repository since 2018 (for good reasons). But glad you found it and thanks for flagging it 🙂