Startup User File Backdoor

Linux, write a file in ~/.config/autostart/NAME_OF_FILE.desktop

In : ~/.config/autostart/*.desktop

[Desktop Entry]
Type=Application
Name=Welcome
Exec=/var/lib/gnome-welcome-tour
AutostartCondition=unless-exists ~/.cache/gnome-getting-started-docs/seen-getting-started-guide
OnlyShowIn=GNOME;
X-GNOME-Autostart-enabled=false