You can just download the database from php admin and replace the malware from text editor. and upload it again. This is how you can remove the malware from your website.
But, i explained you the simple way to remove the malware from your website. So, here is the steps to remove this malware form your website permanently.
How to Remove Simpleoneline [dot] online Malware From your WordPress Website
This is the script below which is added to every page in your website. So the steps below will remove the malware from your website.
#1 Export all the Content from WordPress
Export all the content from WordPress tool. Remember one thing export all the file individually also, Like – Post, Pages, Media, Schema, Media and much more.
Export every plugin setting you are using before.
#2 Download the 20## Folder from Cpanel
Download the folder consist of images. so that your post images will be safe. you will download your images form upload folder in “wp-content/uploads” folder.
#3 Install the WordPress Again
Install WordPress on your website or you can delete all your post. But installing fresh WordPress is more helpful and trusted to remove malware from all infected files.
#4 Edit the Exported file in Notepad
Edit each and every file you exported from WordPress in notepad to remove the malware. This is the most important part to remove the malware from your content.
Just Search the code from the exported file and delete it. To make is eassy and fast you can replace the code with replace tool.
#5 Upload the Downloaded folder at the same place from cpanel
Scan the folder in your computer from antivirus before uploading the folder. This folder is consist of your images and upload it to “wp-content/uploads”.
#5 Import the Edited backup File in WordPress
Import the Post, Pages and Media in your new WordPress Website.
Well Done you have your website without malware without lossing your post, Pages, and Media.
You can scan for malware from Here
Precaution to avoid this malware attack again
# Do not use 3rd party plugins in your website.
# Change the permission of .htaccess and wp-config.php to “444”.
# Always use SSL certificate to avoid the malware attacks.
# Change the cpanel and FTP passwords and username.
# Do not login your cpanel to insecure place.
If, you find difficulty again, feel free to contact us at firstname.lastname@example.org . we are here to help you to remove the malware from your website.