COVID-19 Chloroquine Pharmaspam

A recent SiteCheck scan of an organization’s website showed an interesting pharmacy spam injection targeting COVID-19-related pages of websites. The HTML that was flagged by our SiteCheck signature, spam-seo.hidden_content?100.2, shows why the pharmacy spam text was not displayed on the infected web page: This spammer is trying to obfuscate their link injection by assigning a More Info »

CDN-Filestore Credit Card Stealer for Magento

During a website remediation, we recently discovered a new version of a Magento credit card stealer which sends all compromised data to the malicious domain cdn-filestore[dot]com. My colleague Luke Leal originally wrote about this malware in a blog post earlier this year. Malware Evolution & Evasive Techniques One primary difference between this new version and More Info »

Web Crawler & User Agent Blocking Techniques

This is a simple script that allows hackers to block specific crawlers based upon website requests from specific user-agents. This is useful when you don’t want certain traffic from being able to load certain content – usually a phishing page or a malicious download. if(preg_match(‘/bot|crawler|spider|facebook|alexa|twitter|curl/i’, $_SERVER[‘HTTP_USER_AGENT’])) { logger(“[BOT] {$_SERVER[‘REQUEST_URI’]} – 500”); header(‘HTTP/1.1 500 Internal Server More Info »

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 clear to see when viewing the file’s PHP code. For instance, this section of the PHP code is obfuscated using this method: if ($_GET[“x72145156x61155x65”] == More Info »

How SSL Works with a Website Firewall

It’s no secret that a secure sockets layer (SSL) encrypts data as it moves between a visitor’s browser and the site host. For many people, a single SSL appears to be sufficient for protecting data exchanged between visitors and their website. But what happens to your SSL protection when you add a web application firewall More Info »

PHP Binary Downloader

When possible, an attacker will want to avoid using specific functions in their PHP code that they know are more likely to be flagged by a scanner. Some examples of suspicious functions commonly detected include system and file_put_contents. In this malware dropper file we recently found on a compromised website, the attacker chose to create More Info »

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 another similar injection example and describe some of the malicious behavior we’ve seen recently on compromised websites. Obfuscated PHP Backdoor Discovered by our Remediation team, More Info »

Vulnerabilities Digest: July 2020

Relevant Plugins and Vulnerabilities: Plugin Vulnerability Patched Version Installs Asset CleanUp: Page Speed Authenticated XSS 1.4.6.7 80000 Quiz And Survey Master Authenticated Stored XSS 7.0.0 30000 Comments – wpDiscuz 7.0.0 – Arbitrary File Upload 7.0.5 70000 Real Estate 7 Reflected XSS 3.0.4 8000 CarePlus Reflected XSS — 5000 WooCommerce Subscriptions Unauthenticated Stored XSS 2.6.3 10000 More Info »