Victor Santoyo
Sucuri Malware Research Team
Marc KranatWordPress Vulnerability & Patch Roundup — July 2025
Vulnerability reports and responsible disclosures are essential for website security awareness and education. Automated attacks targeting known software vulnerabilities are one of the leading causes…
Why Your Website Might Be Throwing a 421 SNI Error (And What to Do About It)
So, your support team is suddenly flooded with tickets about “421 Misdirected Request” errors, and you’re wondering if the internet is just having a bad…
Unauthorized Admin User Created via Disguised WordPress Plugin
Puja Srivastava Recently at Sucuri, we investigated a malware case reported by one of our clients. Their WordPress site was compromised, and the attacker had installed a…
Uncovering a Stealthy WordPress Backdoor in mu-plugins
Recently, our team uncovered a particularly sneaky piece of malware tucked away in a place many WordPress users don’t even know exists: the mu-plugins folder.…
Product Update – New Backups Platform
Sucuri is pleased to announce the completion of a product upgrade with our new Backups platform. For those already subscribed to our Backups platform, you…
WordPress Redirect Malware Hidden in Google Tag Manager Code
Last month, a customer contacted us after noticing their WordPress website was unexpectedly redirecting to a spam domain. The redirection occurred approximately 4-5 seconds after…
Stealthy PHP Malware Uses ZIP Archive to Redirect WordPress Visitors
Last month, a customer contacted us, concerned about persistent and inexplicable redirects on their WordPress website. Our investigation quickly unearthed a sophisticated piece of malware…
Attackers Inject Code into WordPress Theme to Redirect Visitors
Matt Morrow In a recent article we discussed some of the reasons sites are frequently attacked. That article covered browser redirects, and we’ll explore an example of…
Fake Spam Plugin Uses Victim’s Domain Name to Evade Detection
Kayleigh Martin During our investigation of an SEO spam infection (spam content designed to manipulate search engine results), we discovered a nicely crafted plugin that named itself…
Vulnerability & Patch Roundup — June 2025
Vulnerability reports and responsible disclosures are essential for website security awareness and education. Automated attacks targeting known software vulnerabilities are one of the leading causes…
Stealthy WordPress Malware Drops Windows Trojan via PHP Backdoor
Last month, we encountered a particularly interesting and complex malware case that stood out from the usual infections we see in compromised WordPress websites. At…