Japan hack - How can i remove indexed pages?

Many Website owners are worried about Japanese SEO spams that can hack the pages in search engines. Japanese SEO spam is a new technique that has being a source of trouble for many website owners. Japanese SEO spam creates the auto generated Japanese text in search results by hijacking Google Search results. Japanese text is displayed in title and description of the pages that have been hijacked.

This spam is also known as the “Japanese Keyword Hack”, “Japanese Search Spam” or the “Japanese Symbol Spam”.

Usually, while using a Content Management System (CMS) like OpenCart, Magento, Drupal or WordPress auto generated Japanese SEO Spam pages are displayed. Sale brand merchandise is sold by these pages as these fake pages include the links to store. Revenue is generated from outbound links from the store by using these ‘Spamvetised’ products.

You should also prevent your website from malicious attacks by scanning your sites regularly and changing the passwords frequently. You can also use Two-Factor Authentication, and keep your CMS, plugins, modules and extensions up to date in order to prevent attacks. Moreover, you can also subscribe to a security service that will keep a check on your website.
Do you have any idea how these types of hack attack occurs?
 
Hi, a month ago few of my sites were attacked from the japan hack.

It creates thousands of pages with japan content and index them.

I stopped it in the beginning, but it indexed 100 pages (there were other 100.000). I removed all the malwares and all the backdoor, but i still have indexed those pages.

Now all these pages are 404 (i know they do cloak, i checked with live test on gsc).

How can I deindex them? I thought of creating a sitemap with all of these ulrs and send to google, since they're nofollow i think they will be deindexed.

Some idea?
I would move to another host. and restart the site

this way you remove the virus/exploit and can be sure your site is fine

in GSC you can delete the malicious pages from serps
 
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