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When webmasters or hosting companies look for malware, they usually search for encrypted code, encoded payloads, suspicious functions and much more. If they happen to find any of those instances, it’s a common practice to either remove or rename the file in question.

If the file being flagged hits a certain amount of suspicious code or raises red flags based on different variables, hosting companies may rename those files from file.php to file.php.suspected (Appending .suspected in the end) - this way the file loses its ability to be interpreted by the webserver. However, sometimes there are backdoors nearby ready to release the prisoners.

The following code was found during an incident response investigation:

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When dealing with compromised scenarios, our team has to be very thorough to remove all pieces of malware in the infected website. Most of the time attackers don’t inject single bits of code but a variety of malware to increase the chances of maintaining access to the compromised resource while reducing the chances of getting caught.

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There is often a misconception regarding the tools that attackers implement in their malicious activity, and that misconception is that they must be using advanced computer programs to target and exploit other computers.

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On a daily basis we find different kinds of malware like backdoors, credit card stealers, injected scripts, and phishing pages. While each one of those catches our attention, we recently found an interesting WordPress administration login bypass script.

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Each and every day the attackers get more clever and exploit new attack vectors. Sucuri Labs recently found a malicious JavaScript hidden in the database of a WordPress website.

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A very common pattern in compromised websites is the presence of backdoors and other malicious codes. Attackers use different techniques and malware to abuse of server resources, distribute spam and at the same time, maintain access to the site for as long as they can.

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Lately we've been dealing with an increase in attacks against ecommerce platforms. Attackers usually choose this type of solution (like Magento & others) because of the sensitive information on credit cards they can extract, as well as other potential monetary gains.

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For many years, spam injections placed inside legitimate pages remain one of the prevalent types of black hat SEO hacks that we clean. Hackers constantly invent new tricks to make spam blocks invisible to human visitors while indexable by search engines.

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Injecting malware into core files of CMS installations is one of the techniques attackers use. From the user’s perspective, it is easier to detect and remediate such cases if they are using a File Integrity Monitoring system. On the other hand, if they are not monitoring file changes, they could be afraid of modifying such core files, therefore leaving the website infected.

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Website defacement is still a big issue for various website owners. It directly impacts on your online presence / visibility and as a consequence, it may get your website flagged as “Hacked” by different search engines.

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