Remove malicious code from the source code of the site files

Quote from gastinger, it is necessary to solve the issue.
Dont really understand the cost so look forward to your quotes at least approximately.

In scripts Your hosting account malicious code is detected. The list of malicious files is the link :
http://vs.cityhost.ua/28848d6d


Please :
1.To remove the malicious code from the source code files of the website.
2.Tell us about the work carried out in response to this letter!
After removing the code, our specialists will conduct re-scanning the website.

In order to protect not only our server, but also protect Your website from further intrusion - we block to Your website the opportunity to make outgoing connections to the entire hosting account, as well as block the possibility of using phpmail function, which in turn will reduce the possibility of further infecting Your website. This measure will protect our customers from possible contamination software and computer equipment, as well as prevent possible theft of personal data and will not affect in negative way on working of the service as a whole. For unlock you need to do is to clean up the site from malicious signatures.

Draw your attention to the fact that the matter has nothing to do with security level of the server hosting provider and due solely to the vulnerability in the security of your website.

To determine the cause of infection files of your website is recommended:
1.To check the date of creation/change of files with malicious code and analyzing the logs of access to the website in this timeframe.
2.Check the logs of access to the site and to analyze how data files were created/modified.
3.Test site scripting vulnerabilities to prevent their reuse by attackers to download malicious code.

We also recommend to update your CMS and its plugins/modules in order to minimize the risk of a similar situation in the future, as in updates, the developers fix the previously found vulnerabilities. Do not install plugins from unverified sources.

Be careful! Conventional removal of malicious code without taking additional security measures can make your site easy prey to hackers and lead to re-infection.

Note : at the report, You will see a button "I cleaned", clicking on which You can launch a re-scan of Your site and if re-inspection of the malicious signature is found — the restrictions will be lifted automatically within hours. It is also important to understand that in day there are two scans on free of charge basis, starting each subsequent = 50 UAH