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 malware don’t contain any content, which could be an attempt to avoid detection […]
Tag Archives: Website Security
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 a feature or functionality for other developers to reference. Oftentimes, hackers aren’t interested in leaving comments describing how their injected malware works. Instead, they use […]
ALFA TEaM Shell ~ v4.1-Tesla: A Feature Update Analysis
We’ve seen a wider variety of PHP web shells being used by attackers this year — including a number of shells that have been significantly updated in an attempt to “improve” them. Depending on the scope of changes and feature enhancements that are added to an existing web shell’s source code, these updates can be […]
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, we’ll end up with the following code: var _0x446d=[“_mauthtoken”,”indexOf”,”cookie”,”userAgent”,”vendor”,”opera”,”hxxps://zeep.ly/ev4Va”,”googlebot”,”test”,”substr”,”getTime”,”_mauthtoken=1; path=/;expires=”,”toUTCString”,”location”]; In this array, you can find a […]
CSS-JS Steganography in Fake Flash Player Update Malware
This summer, MalwareBytes researcher Jérôme Segura wrote an article about how criminals use image files (.ico) to hide JavaScript credit card stealers on compromised e-commerce sites. In a tweet, Affable Kraut also reported another similar obfuscation technique using .ico files to conceal JavaScript skimmers. Just something I’ve noticed more recently with digital skimmers/#magecart. Obfuscated code […]
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 as well. Are You Affected? This vulnerability is exploitable on every WordPress site […]
P.A.S. Fork v. 1.0 — A Web Shell Revival
A PHP shell containing multiple functions can easily consist of thousands of lines of code, so it’s no surprise that attackers often reuse the code from some of the most popular PHP web shells, like WSO or b374k. After all, if these popular (and readily available) PHP web shells do the job, there’s no need […]
Password Security & Password Managers
In the spirit of National Cyber Security Awareness Month (NCSAM), let’s talk about a security basic that many people overlook: passwords. These are one of the most fundamental aspects of website security, yet we too often see webmasters taking a lax approach to secure passwords. In fact, the online security provider TeamPassword found that last […]
R_Evil WordPress Hacktool & Malicious JavaScript Injections
We often see hackers reusing the same malware, with only a few new adjustments to obfuscate the code so that it is more difficult for scanning tools to detect. However, sometimes entirely new attack tools are created and deployed by threat actors who don’t want to rely on obfuscating existing malware. Confusing Name – R_Evil […]
A Quick Glance at Cross-Origin Resource Sharing Security Headers
Thanks to the rapid growth of JavaScript frameworks such as Angular, Vue, and React, CORS has become a popular word in the developer’s vocabulary. When requesting information from an external source such as an API (a pretty common practice for client-side JavaScript code), the origin of the resource must tell the web browser which domain, […]
