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If your website contains a virus after an attack that installs itself on your visitors' computers when they visit the website, Google will warn you. All common web browsers will then block the access to your website with a red warning message.
Since this is a serious attack, you should act quickly. To do this, you need the Google Search Console:
Log in to your search console - or register if you are not already logged in.
All steps are very simple and explained here: https://support.google.com/webmasters/answer/34397?hl=en&ref_topic=3309469
Read the security incident messages and follow the instructions to clean up the web page.
Further information can be found here: https://support.google.com/webmasters/answer/163634
Some listings require a Google check after the website has been cleaned up.
Read more about this: https://support.google.com/websearch/answer/45449?hl=en&ref_topic=3425513