This section describes a web shell that can infect (or be installed by hackers) WordPress.
What is a Web Shell?
A web shell is a generic term for a type of backdoor that can be accessed and used via the Web (online).
Think of a backdoor as a hacker’s way in on a server.
In WordPress, web shells are often installed as PHP program files by hackers who take advantage of vulnerabilities to alter files on the server.
Examples of web shells installed by WordPress tampering
The above malware is a very simple web shell with file upload functionality.
Web shells with complex functions may have the ability to execute OS commands, or have the ability to tamper with databases.
Web shells that are obfuscated and placed in deep hierarchies are difficult to find.
Web shells are often located in the top directory of a WordPress site, but since many of them can run in a single file, they are often located deep within the WordPress hierarchy, and their code may be obfuscated, making them difficult to find even when searching for strings such as “Shell. Shell” and so on.
The easiest way to check for web shell installations is to use a plugin that comprehensively scans WordPress files for tens of thousands of malware detection patterns.
If you like, you can use a free plugin to inspect and remove malware.
Free WordPress:Malware Scan & Security Plug-in [Malware and Virus Detection and Removal].
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