How to deindex 5000 posts and delete from SERP

Hi

I had an attack to my wordpress site. Hacker uploaded some script, who every time you refresh site, produces new "posts". Posts weren't created as Wordpress posts, new files with .htacess redirect. Spun articles with shitty links.

I kick off this scripts, but google still showed these posts in SERPs. It's more than 5000 posts. Now all these articles are "404" but they don't disappear from google. How to remove it? All 404 are "noindex follow" but still appears.

I thought about 404 to 301 but they are totally not connected (these articles with my niche). I don't know if any links provide to I, so I don't want to hurt my site after 301 redirect.

How do you think? What is the best way to do?

I have a client that faced similar situation & about 4500 pages were made.....
We initially removed 100+ pages manually but getting so many pages removed this way would have taken so much time.
So we developed a bot for ourself to do this & have successfully taken down more than 2500 pages within 2 weeks on serps....
All other pages have been processed but it will take another few weeks to remove all pages from serps.

Submit removal request in search console.