Root kit is a a piece of software allowing the user to have root command to all of the system.
Root kits allow admin access and controls over systems, this means the individual can access anything they want and do untold damage to the system and associated. This means the individual can install whatever they want to the system but also impersonate the system/user.
The risk of a root kit is very high it is often sent alongside other attacks. It can be found in malware/ddos attacks but also trojans sometimes have root kits hidden inside them. These are one of the worst attacks affecting businesses as they enable an individual to do a large amount of damage and take a lot of data.
Good anti-malware/virus it sounds simple but a lack of software to prevent these attacks. Having this software up to date allows a greater level of security as this software attack coincides others more often than not. Being able to detect these issues and attacks before they happen is key in prevention.
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