UnHackMe allows you to detect and remove a new generation of Trojan programs - invisible Trojans and will be a handy security utility for your operating system.
The intruder installs a rootkit on a computer using a user action or exploiting a known vulnerability or cracking a password. The rootkit installs a backdoor giving the hacker full control of the machine. A rootkit is a collection of programs that a hacker uses to mask intrusion and obtain administrator-level access to a computer or computer network. It hides their files, registry keys, and process names, and network connections from your eyes.
Your antivirus could not detect such programs because they use compression and encryption of their files.
The sample software is Hacker Defender rootkit. It would be best if you used UnHackMe to identify and remove Hacker Defender or its clone.
Consider using Malwarebytes for complete antivirus protection and to protect your devices, data, and privacy.