What exactly is the Trojan Horse up to? What was it trying to do? You have to find the answer.
Scanning the device, you find that this horrible device just keeps getting worse; the Trojan horse was used to sneak a rootkit onto the system.
Rootkits are a collection of malicious programs that secretly provide continued, privileged access to a system for an unauthorized user. A rootkit can create a backdoor on a computer to let a hacker in. This rootkit was able to gain admin access to this computer, and it will be incredibly hard to remove.
In this case, the Trojan Horse pretended to be a trustworthy antivirus software in order to install a rootkit. This means that a malicious, third-party somewhere has admin access to this computer and its data. This is a nightmare scenario for the confidentiality and integrity of your client’s system. While some specialized tools can remove a rootkit, it isn’t easy.