Proxy Virus - Cant change Proxy from setting (automatically put again the proxy when I close the window) - Can't change it from terminal (adminright but no adminrights?)

Dear Communities,

I have a proxy in my settings. When I erase it and untick, at the moment that I close the window, the proxy is set up again.

I have tried to delete it from the terminal, I have checked if I had the admin rights ( that I have) and when I run  

networksetup -setwebproxystate Wi-fi off

I got the message

** Error: Command requires admin privileges.

No idea what to do?????

I pasted the messages from my terminal thereafter.

And a copy of my terminal:

alexandredelode@mbpdealexandre ~ % 

 [Restored 23 Oct 2021 at 01:18:10]

Last login: Sat Oct 23 01:17:59 on console

Restored session: Sat Oct 23 01:01:48 EEST 2021

alexandredelode@mbpdealexandre ~ % echo "no_proxy"

no_proxy

alexandredelode@mbpdealexandre ~ % echo no_proxy  

no_proxy

alexandredelode@mbpdealexandre ~ % su alexandre delode

Password:

su: Sorry

alexandredelode@mbpdealexandre ~ % su alexandredelode 

Password:

alexandredelode@mbpdealexandre ~ % networksetup -getwebproxy "Wi-Fi"

Enabled: Yes

Server: 51.77.159.133

Port: 80

Authenticated Proxy Enabled: 0

alexandredelode@mbpdealexandre ~ % networksetup -setwebproxystate "Wi-fi" off

** Error: Command requires admin privileges.

alexandredelode@mbpdealexandre ~ % #!/bin/sh

zsh: event not found: /bin/sh

alexandredelode@mbpdealexandre ~ % bash

The default interactive shell is now zsh.

To update your account to use zsh, please run `chsh -s /bin/zsh`.

For more details, please visit https://support.apple.com/kb/HT208050.

bash-3.2$ #!/bin/sh

bash-3.2$ dscl . -read /Groups/admin GroupMembership

GroupMembership: root alexandredelode

bash-3.2$ networksetup -setwebproxystate Wi-fi off

** Error: Command requires admin privileges.

bash-3.2$ who am I

alexandredelode ttys000 Oct 23 01:18 

bash-3.2$ dscl . read /groups/admin GroupMembership

GroupMembership: root alexandredelode

bash-3.2$ networksetup -setwebproxystate Wi-fi off

** Error: Command requires admin privileges.

bash-3.2$