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Fake Plugins with Popuplink.js Redirect to Scam Sites

Since July, we’ve been observing a massive WordPress infection that is responsible for unwanted redirects to scam and ad sites. This infection involves the tiny.cc URL shortener, a fake plugin that has been called either “index” or “wp_update”, and a malicious popuplink.js file. Infected pages typically have these two scripts in the <head> section of... Read More

How to Improve Your Website Posture – Part I

Have you ever wondered if your website security posture is adequate enough? The risk of having a website compromise is never going to be zero. However, as a webmaster, you can play an important role in minimizing the chances of a website hack. A good security posture entails how to understand the importance of securing... Read More

How to Improve Website Resilience for DDoS Attacks – Part II – Caching

In the first post of this series, we talked about the practices that will optimize your site and increase your website’s resilience to DDoS attacks. Today, we are going to focus on caching best practices that can reduce the chances of a DDoS attack bringing down your site. Website caching is a technique to store... Read More

Cookie Consent Script Used to Distribute Malware

Most websites today use cookies. Since May 25th, 2018, all websites that do business in the European Union (EU) had to make some changes to be compliant with the EU General Data Protection Regulation (GDPR). Even though cookie usage is mentioned only once in GDPR, any organization utilizing them to track users’ browsing activity have... Read More

Cryptominers: Binary-Process-Cron Variants and Methods of Removal

This post provides a brief overview of how to manually remove server-side cryptominers and other types of Binary-Process-Cron malware from a server. Unlike browser-based JavaScript cryptominers that have been injected into a web page, a binary server-level cryptominer abuses server resources without affecting the computers or mobile devices of site visitors. We will cover the... Read More

RawGit CDN is Abused by CryptoLoot Cryptominers

Recently, we came across another way to use files from GitHub repositories in malware infections. This time the infections weren’t via GitHub.io, raw.githubusercontent.com, or github.com/<user>/<repository>/raw/ URLs. The new trick involved a third-party service called RawGit that provides a CDN for GitHub files. This is the script that we found injected into .js and theme files... Read More

Browser Extension Bug Leads to Post Injection

A few years ago, we saw how a browser extension introduced a threat to serve unwanted ads. Today, the number of browser extensions available to users has grown, along with the risk for this similar behavior to occur. We recently came across a similar case where several completely different websites contained what appeared to be... Read More

Ask Sucuri: How Do You Find Website Backdoors?

In a previous post, we have explained what website backdoors are and what they look like. Today, we want to focus on ways that we identify and remove backdoors to prevent reinfection. Techniques to Find Backdoors Finding a website backdoor is not an easy task because the main function of a backdoor is to keep... Read More