#FIREFOX RUNS SLOW ON VIRTUAL BOX CODE#In addition to code obfuscation, anti-debugger tricks and now anti-vm checks, defenders will have to spend more time to identify and protect against those attacks or at least come up with effective countermeasures. This is a natural trade-off that we must expect. This is not surprising to see such evasion techniques being adopted by criminals, however it shows that as we get better at detecting and reporting attacks, threat actors also evolve their code eventually. The data is then encoded and exfiltrated to the same host via a single POST request: Evasion and defenders It also collects any password (many online stores allow customers to register an account), the browser’s user-agent and a unique user ID. The skimmer scrapes a number of fields including the customer’s name, address, email and phone number as well as their credit card data. If the machine passes the check, the personal data exfiltration process can take place normally. Google Chrome uses SwiftShader while Firefox relies on llvmpipe as its renderer fallback.īy performing this in-browser check, the threat actor can exclude researchers and sandboxes and only allow real victims to be targeted by the skimmer. After a first view everything works fine. Virtualbox itself is running on a Ubuntu 16.04 host. The Virtualbox guest additions are installed from Virtualbox Addition ISO. I am testing Ubuntu 17.10 Desktop as a Virtualbox 5.2 guest. We notice that the skimmer is checking for the presence of the words swiftshader, llvmpipe and virtualbox. Firefox slow down Ubuntu 17.10 as Virtualbox guest. #FIREFOX RUNS SLOW ON VIRTUAL BOX SOFTWARE#Alternatively, it could be supported by the virtualization software but still leak its name. #FIREFOX RUNS SLOW ON VIRTUAL BOX DRIVER#We can see that it identifies the graphics renderer and returns its name.įor many Virtual Machines, the graphics card driver will be a software renderer fallback from the hardware (GPU) renderer. There is one interesting function within this skimmer script that uses the WebGL JavaScript API to gather information about the user’s machine. Note that browsing directly to the URL will return a decoy Angular library. Suspicious JavaScript is being loaded alongside an image of payment methods. Our investigation started by looking at a newly reported domain that could possibly be related to Magecart. In this blog post we show how a Magecart threat actor distributing a digital skimmer is avoiding researchers and possibly sandboxes by ensuring users are running genuine computers and not virtual ones. But that feature does exist in modern browsers and can be quite effective. ![]() Typically threat actors are content with filtering targets based on geolocation and user-agent strings. Many malware families incorporate these anti-vm features, usually as a first layer.įor web threats, it is more rare to see detection of virtual machines via the browser. Reverse engineers are accustomed to encountering code snippets that check certain registry keys, looking for specific values indicating the presence of VMware or Virtual Box, two of the most popular pieces of virtualization software. ![]() Perhaps the most popular method is to detect virtual machines commonly used by security researchers and sandboxing solutions. There are many techniques threat actors use to slow down analysis or, even better, evade detection. This blog post was authored by Jérôme Segura
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