From the attacker’s perspective, creating ways to maintain access to a compromised website is desirable. This allows them to further distribute malware and perform different kinds of malicious activities. One of the ways attackers try to secure their access is by adding admin users, or pieces of malicious code throughout the site. This allows them […]
Tag Archives: Website Backdoor
New XM1RPC SEO Spam and Backdoor Campaign
We have been monitoring a new campaign specifically targeting WordPress sites, using hundreds of them for SEO spam distribution. We call it the XM1RPC campaign due to the common backdoor used across all of the compromised sites. The file is named in such a way as to confuse WordPress administrators who are familiar with XML-RPC. […]
Learning From Buggy WordPress Wp-login Malware
When a site gets hacked, the attack doesn’t end with the malicious payload or spam content. Hackers know that most website administrators will clean up the infection and look no further. Many go on to patch vulnerable software, change their passwords, and perform other post-hack steps. All of this is good, but hackers who follow […]
New Realstatistics Attack Vector Compromising Joomla Sites
Over the past few weeks we’ve seen a large number of Joomla websites compromised with the Realstatistics malware campaign. This mass infection is still evolving and continues to distribute harmful ransomware to compromised website visitors. Today we are providing more context on the new attack vector and exploitation process used to to compromise these sites…. […]
Backdoor in Fake Joomla! Core Files
We usually write a lot about obfuscation methods on Sucuri Labs and here on the blog. Sometimes we write about free tools to obfuscate your code that aren’t that free and we also have an online tool to help decoding the malware you find. But sometimes the malware is not clearly encoded using base64, gzinflate, hex concatenation,… […]
Finding Conditional SEO Spam in Drupal
Nobody likes spam. It’s never fun (unless you’re watching Monty Python). For us it comes with the territory; removing SEO spam has been at the core of what we deal with since our inception, giving us some pretty good insights into the various strategies black hats employ. From time to time however, we find ourselvesRead […]
ASP Backdoors? Sure! It’s not just about PHP
I recently came to the realization that it might appear that we’re partial to PHP and WordPress. This realization has brought about an overwhelming need to correct that perception. While they do make up an interesting percentage, there are various other platforms and languages that have similar if not more devastating implications. Take into consideration […]
Manipulating WordPress Plugin Functions to Inject Malware
Most authors of website malware usually rely on the same tricks making it easy for malware researchers to spot obfuscated code, random files that don’t belong, and malicious lines injected at the top of a file. However, it can become difficult when the malware is buried deep within the lines of code on normal files.. […]
