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Labs Note

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 10, 2020Krasimir Konov

Malware Dropper Takes Advantage of COVID-19 Pandemic

Since April, our team has been tracking the spread of a PHP malware dropper. It’s impacting unsuspecting victims who thought they were downloading a mapping software to monitor the spread…

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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 4, 2020Luke Leal

Obfuscation Techniques in MARIJUANA Shell “Bypass”

Attackers are always trying to come up with new ways to evade detection from the wide range of security controls available for web applications. This also extends to malware like…

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Labs Note

November 26, 2020Luke Leal

Hackers Love Expired Domains

Sometimes, website owners no longer want to own a domain name and they allow it to expire without attempting to renew it. This happens all the time and is totally…

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Labs Note

November 23, 2020Luke Leal

Hidden SEO Spam Link Injections on WordPress Sites

Often when a website is injected with SEO spam, the owner is completely unaware of the issue until they begin to receive warnings from search engines or blacklists. This is…

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Labs Note

November 18, 2020Luke Leal

PrestaShop SuperAdmin Injector and Login Stealer

According to W3Tech’s data, PrestaShop is among the most popular CMS choices for existing ecommerce websites, so it should come as no surprise that malware has been created to specifically…

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Labs Note

November 17, 2020Cesar Anjos

Evasive Maneuvers in Data Stealing Gateways

We have already shared examples of many kinds of malware that rely on an external gateway to receive or return data, such as different malware payloads. During a recent investigation,…

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Labs Note

November 11, 2020Denis Sinegubko

Another Credit Card Stealer That Pretends to Be Sucuri

During a routine investigation, we found yet another web skimmer that pretends to be related to Sucuri. One of our Remediation Analysts, Liam Smith, found the following code injected into…

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Uncommon Radixes Obfuscation

November 9, 2020Luke Leal

Code Comments Reveal SCP-173 Malware

We sometimes find malware code injections that contain strange code comments, which are normally used by programmers to annotate a section of code — for example, a short description of…

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Labs Note

November 4, 2020Krasimir Konov

Legacy Mauthtoken Malware Continues to Redirect Mobile Users

During malware analysis, we regularly find variations of this injected script on various compromised websites: . The variable “_0x446d” assigns hex encoded strings in different positions in the array. If…

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