Malwares are malicious code or program intended to damage you website or computer.
Malwares can be injected to your website using any vulnerabilities in your website code. Any outdated plugins or any plugins downloaded from untrusted sources may create such vulnerabilities in your websites.
To prevent this,
1) Do regular audits on your website code with the help of a code expert.
2) Do regular online or offline scan on your website code with the help of any latest malware scanning tools.
3) Make sure the theme and plugins used in your website are secure and uptodate.
* Keep backup your website code and database in regular intervals.
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