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Search Results for: backdoor

January 7, 2021Luke Leal

Evaluating Cookies to Hide Backdoors

Identifying website backdoors is not always an easy task. Since a backdoors primary function is to conceal itself while providing unauthorized access, they are often developed using a variety of techniques that can make it challenging to detect. For example, an attacker can inject a…

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Labs Note

December 8, 2020Douglas Santos

Fake WordPress Functions Conceal assert() Backdoor

A few weeks ago, I was manually inspecting some files on a compromised website. While checking on a specific WooCommerce file, I noticed something interesting. Among 246 other lines, this…

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Labs Note

December 1, 2020Luke Leal

“Free” Symchanger Malware Tricks Users Into Installing Backdoor

In a previous post, I discussed how attackers can trick website owners into installing malware onto a website — granting the attacker the same unauthorized access as if they had…

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Labs Note

October 6, 2020Krasimir Konov

Backdoor Shell Dropper Deploys CMS-Specific Malware

A large majority of the malware we find on compromised websites are backdoors that allow an attacker to maintain unauthorized access to the site and execute whatever commands they want….

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Labs Note

September 28, 2020Luke Leal

Backdoor Obfuscation: tempnam & URL Encoding

In an attempt to avoid detection, attackers and malware authors are always experimenting with different methods to obfuscate their malicious code. During a recent investigation, we came across an interesting…

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August 26, 2020Luke Leal

Magento Multiversion (1.x/2.x) Backdoor

The Magento 1 EOL date has already passed, however it’s evident that a large number of websites will continue to use it for the foreseeable future. Unfortunately, attackers are also…

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Fake WordPress Plugin SiteSpeed Hosts Malicious Ads & Backdoors

August 13, 2020Luke Leal

Smoker Backdoor: Evasion Techniques in Webshell Backdoors

“Smoker Backdoor” is a PHP webshell backdoor that uses hexadecimal and decimal obfuscation in conjunction with the PHP function goto to evade detection from malware scanners. The hexadecimal/decimal obfuscation is…

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Down the Malware Rabbit Hole Part 2

August 5, 2020Luke Leal

PHP Backdoor Obfuscated One Liner

In the past, I have explained how small one line PHP backdoors use obfuscation and strings of code in HTTP requests to pass attacker’s commands to backdoors. Today, I’ll highlight…

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Fake WordPress Plugin SiteSpeed Hosts Malicious Ads & Backdoors

July 16, 2020Krasimir Konov

Fake WordPress Plugin SiteSpeed Serves Malicious Ads & Backdoors

Fake WordPress plugins appear to be trending as an effective way of establishing a foothold on compromised websites. During a recent investigation, we discovered a fake component which was masquerading…

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Pirated WordPress & Magento Plugins

July 8, 2020Luke Leal

Pirated WordPress Plugins Bundled with Backdoors

One widespread belief among webmasters is that attackers typically only compromise websites in a couple of ways: by exploiting vulnerabilities or stealing login credentials. Although these are certainly two of…

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PinnacleCart Server-Side Skimmer & Backdoor

April 22, 2020Denis Sinegubko

PinnacleCart Server-Side Skimmers and Backdoors

While open-source ecommerce platforms are the most common targets for web skimmers, hackers also target paid-for software — especially if it’s used on high-profile online stores with large user-bases. This…

Read More about PinnacleCart Server-Side Skimmers and Backdoors

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