Manipulating WordPress Plugin Functions to Inject Malware

Most authors of website malware usually rely on the same tricks, making it easy for malware researchers to spot obfuscated code, random files that don’t belong, and malicious lines injected at the top of a file. However, it can become difficult when the malware is buried deep within the lines of code on normal files.

Why is some malware harder to spot than others?

An attacker’s primary goal is to retain access to an infected site, so they go to great lengths to hide their access methods. There may be hundreds of malicious files that are easy to find. As long as the attacker can regain access, ultimately reinfecting your website, it doesn’t really matter how clever they are in hiding the payload. It’s why it is so important to place extra emphasis in identifying the access vector, most often known as a backdoor.
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Unmasking “Free” Premium WordPress Plugins

WordPress has a large repository of free plugins (currently 30,000+) that can add almost any functionality to your blog. However, there is still a market for premium plugins. Premium plugins are especially popular when they help blogs make money: eCommerce, SEO, affiliate and customer management, and so on.

Such plugins may be really great and well worth their price, but not many webmasters are ready to pay for plugins, especially when they can find “free” or “nulled” versions of the same plugins on the Internet. All they need to do is search Google for [<plugin-name> free download].

Getting something valuable for free may sound great, however, in most cases, you won’t get what you expect. After all, you should ask yourself the question, why would someone spend their time to steal software, and then post it to various sites and forums where they can’t even count on any advertising revenue? Usually, the answer is that they expect to take advantage of the sites that install the software they post. How? By adding some undisclosed functionality to the stolen plugins like backdoors, ads, hidden links, and SPAM.

In this post, we’ll talk about “patched” malicious premium plugins. We’ll talk about what they do, how they work, and about websites that build their businesses around stolen WordPress themes and plugins.

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