How to remove a rootkit from your PC

A recent update by developer Capcom to the PC version of Street Fighter V was found to contain a piece of software designed to stop the game from being cracked. However, astute gamers soon discovered that it was also installing a rootkit that sought kernel-level access to the operating system, leaving the computer vulnerable to access and attack. The driver at the centre of the storm, called Capcom.sys, was essentially opening a door for users who would normally not have access to the device, to run programs on it. However, Capcom is not the first, and probably not the last, developer to include software in its games that later proves to be more of a hindrance than a help.

What are rootkits?

Rootkits are malicious software that enable the spread of other viruses such as malware, spyware, and spamware. Once installed on a PC, they give unauthorized users access to that system. The rootkit will normally hide on the computer, where it can then send details such as bank accounts or keystrokes to an unauthorized user. It can also modify or corrupt the PC it has burrowed itself into.

Unfortunately rootkits and other malware have become increasingly difficult to detect, evolving alongside the technology that they corrupt. In the case of Street Fighter V, Capcom accidentally created the same situation. In the past, other developers, such as Ubisoft, have had the same issue. When players were using the Uplay features on many of their games, Ubisoft installed some DRM (digital rights management) software to curtail its games being subverted by hackers and pirates. However, this also installed a rootkit that, with some degree of irony, could then be manipulated by the same people the DRM was designed to stop.

How to prevent or stop rootkits?

Regularly running antivirus software can help detect and remove any threats posed by malicious software that has managed to creep onto your PC. Unlike the ones that Capcom and Ubisoft created by accident, most rootkits are designed to steal data, manipulate systems, or corrupt and even crash them. Many arrive in the form or email attachments, or pop-ups from less than reputable websites. If you believe an email is suspicious, scan it or delete it. Likewise, if you do not know or trust a source, do not download anything from it.

Another preventative measure is to check for updates to software you use, and make sure you have installed the most up-to-date version. Technology companies will react quickly to any emerging threat by releasing patches for their products, so it is always best to regularly check for new updates.

If you believe you may have a rootkit or malware installed on your PC, run antivirus software to see if it can detect the threat. ROG owners will be glad to hear that ROG motherboards have the latest Karpersky antivirus software free for download (check if your model is applicable). If you do discover a rootkit present in your PC, this same software can be used to try and erase it, but remember to backup any important data before you do so.