Nulled WordPress themes and plugins are a controversial topic for many in the web development world — and arguably one of the bigger threats to WordPress security. Essentially modified versions of official WordPress themes and plugins with their licensing restrictions removed, these nulled software copies are often touted as premium functionality packaged in a free […]
Tag Archives: Website Backdoor
Konami Code Backdoor Concealed in Image
Attackers are always looking for new ways to conceal their malware and evade detection, whether it’s through new forms of obfuscation, concatenation, or — in this case — unorthodox use of image file extensions. One of the most common backdoors that we have observed over the last few months has been designed to evade detection […]
Massive Campaign Uses Hacked WordPress Sites as Platform for Black Hat Ad Network
Every so often attackers register a new domain to host their malware. In many cases, these new domains are associated with specific malware campaigns, often related to redirecting legitimate website traffic to third party sites of their choosing — including tech support scams, adult dating, phishing, or drive-by-downloads. Since late December, our team has been […]
Backdoor Targets FreePBX Asterisk Management Portal
Written in PHP and JavaScript, FreePBX is a web-based open-source GUI that manages Asterisk, a voice over IP and telephony server. This open-source software allows users to build customer phone systems. During a recent investigation, I came across a simple piece of malware targeting FreePBX’s Asterisk Management portal which allowed attackers to arbitrarily add and […]
New SocGholish Malware Variant Uses Zip Compression & Evasive Techniques
Readers of this blog should already be familiar with SocGholish: a widespread, years-long malware campaign aimed at pushing fake browser updates to unsuspecting web users. Once installed, fake browser updates infect the victim’s computer with various types of malware including remote access trojans (RATs). SocGholish malware is often the first step in severe targeted ransomware […]
Wordfence Evasion Malware Conceals Backdoors
Malware authors, with some notable exceptions, tend to design their malicious code to hide from sight. The techniques they use help their malware stay on the victim’s website for as long as possible and ensure execution. For example — obfuscation techniques, fake code comments, naming conventions for injections that deploy SEO spam, redirect visitors to […]
Top 5 Most Common WordPress Malware Infections: An Anatomy Lesson
WordPress security is serious business – and an essential consideration for anyone using the world’s most popular CMS (Content Management System). While the WordPress team quickly addresses known security issues in WordPress’ core to protect the millions of website owners who rely and depend on the software, the reality is that the same cannot be […]
How to Find & Clean Up the AnonymousFox Hack
The AnonymousFox hack targets insecure websites and actively exploits them to spread phishing, spam, and other malware. A major nuisance for website owners, it also happens to be one of the more prevalent types of malware seen on client sites in the past two years. In this post we’ll describe what AnonymousFox is and how […]
2021 Threat Report Webinar
The threat landscape is constantly shifting. As attackers continue to hone their tools and exploit new vulnerabilities, our team works diligently to identify and analyze threats posed to webmasters. So – what do you need to do to stay one step ahead of attackers? Join Sucuri researcher Ben Martin on July 6th in our latest […]
Analysis of the Massive NDSW/NDSX Malware Campaign
Recently, Avast’s researchers Pavel Novák and Jan Rubín posted a detailed writeup about the “Parrot TDS” campaign involving more than 16,500 infected websites. Such massive infections don’t go unnoticed by Sucuri and we immediately recognized that the infection in their writeup belonged to the campaign we internally refer to as “ndsw/ndsx” malware. We’ve been tracking […]
