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…
On October 6, 2020, our Threat Intelligence team discovered a High-Severity Object Injection vulnerability in Welcart e-Commerce, a WordPress plugin with over 20,000 installations that claims top market share in Japan. After we finished our investigation, we contacted the plugin’s…
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…
On Thursday, October 29, the WordPress core team released WordPress version 5.5.2. This was a minor release containing bug fixes and security enhancements to the core WordPress content management system powering over one-third of the internet. There was a subsequent…
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…
We cover a couple of breaking stories this week, including the emergency release of WordPress 5.5.3 on Friday, October 30. In preparation for this, a number of sites autoupdated to version 5.5.3-alpha. We also look at the the defacement of…
The WordPress core team has released an emergency release of WordPress 5.5.3, just one day after the release of version 5.5.2. This emergency release was done to remedy an issue introduced in WordPress 5.5.2 making it impossible to install WordPress…
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…