Audit Logs .sucuriquarantine

Sucuri’s aduit log keeps repeating this process:

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system Warning: New file added: (multiple entires):
.htaccess (size: 233)
gd-config.php (size: 567)
index.php
license.txt
readme.html
robots.txt
wp-activate.php
wp-admin/about.php
wp-admin/admin-ajax.php
wp-admin/admin-footer.php
wp-admin/admin-functions.php
wp-admin/admin-header.php
wp-admin/admin-post.php
wp-admin/admin.php
wp-admin/async-upload.php
wp-admin/comment.php
wp-admin/credits.php
wp-admin/css/about-rtl.css
wp-admin/css/about-rtl.min.css
wp-admin/css/about.css
etc….

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system Warning: New file added: (multiple entires):
.htaccess (size: 929)
.htaccess_backup_1564517821 (size: 468)
.sucuriquarantine/.htaccess
.sucuriquarantine/index.html
.sucuriquarantine/index.php
.sucuriquarantine/index.php_sucuribackup.1508779062_1508779054wordpressupdate
.sucuriquarantine/wp-activate.php_sucuribackup.1508779061_1508779054wordpressupdate
.sucuriquarantine/wp-admin-srcbak/setup-config.php_sucuribackup.1508797065_1508797002cleanup
.sucuriquarantine/wp-admin-srcbak/setup-config.php_sucuribackup.1508797100_1508797062cleanup
.sucuriquarantine/wp-admin-srcbak/setup-config.php_sucuribackup.1508797140_1508797127cleanup
.sucuriquarantine/wp-admin/about.php_sucuribackup.1508779077_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin-ajax.php_sucuribackup.1508779075_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin-footer.php_sucuribackup.1508779079_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin-functions.php_sucuribackup.1508779082_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin-header.php_sucuribackup.1508779075_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin-post.php_sucuribackup.1508779082_1508779054wordpressupdate
.sucuriquarantine/wp-admin/admin.php_sucuribackup.1508779079_1508779054wordpressupdate
.sucuriquarantine/wp-admin/async-upload.php_sucuribackup.1508779075_1508779054wordpressupdate
.sucuriquarantine/wp-admin/comment.php_sucuribackup.1508779079_1508779054wordpressupdate
.sucuriquarantine/wp-admin/credits.php_sucuribackup.1508779078_1508779054wordpressupdate
.sucuriquarantine/wp-admin/css/about-rtl.css_sucuribackup.1508779082_1508779054wordpressupdate
.sucuriquarantine/wp-admin/css/about-rtl.min.css_sucuribackup.1508779082_1508779054wordpressupdate
.sucuriquarantine/wp-admin/css/about.css_sucuribackup.1508779082_1508779054wordpressupdate
etc…

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What does this mean? What do I need to do to stop it?