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 very specific part stood out to me:
$config = wp_dbase_config_i… Continue reading Fake WordPress Functions Conceal assert() Backdoor

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 PHP shells, which are typically left on compromised websites as a backdo… Continue reading Obfuscation Techniques in MARIJUANA Shell “Bypass”

“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 exploited a vulnerability or compromised login details for the website.
B… Continue reading “Free” Symchanger Malware Tricks Users Into Installing Backdoor

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 normal, but it’s important to remember that attackers regularly monitor domain expiratio… Continue reading Hackers Love Expired Domains

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 by design — attackers intentionally try to prevent detection by arranging inje… Continue reading Hidden SEO Spam Link Injections on WordPress Sites

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 target these environments.
We recently came across an infected… Continue reading PrestaShop SuperAdmin Injector and Login Stealer

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, we came across this example of a PHP script that attackers use for … Continue reading Evasive Maneuvers in Data Stealing Gateways

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 the database of a Magento site.
The first 109 lines of the malw… Continue reading Another Credit Card Stealer That Pretends to Be Sucuri

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 we get the ASCII representation of the variable… Continue reading Legacy Mauthtoken Malware Continues to Redirect Mobile Users

Reflected XSS in WordPress v5.5.1 and Lower

WordPress released version 5.5.2 yesterday, which fixed a reflected XSS vulnerability we reported earlier this year. The root cause of this issue is a bug in the way WordPress determines a user’s current page, and which may cause a few other problems … Continue reading Reflected XSS in WordPress v5.5.1 and Lower