/usr/share/app-install/desktop/ettercap-graphical:ettercap.desktop is in app-install-data 0.12.04.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | [Desktop Entry]
X-AppInstall-Package=ettercap-graphical
X-AppInstall-Popcon=5
X-AppInstall-Section=universe
Type=Application
Name=ettercap
GenericName=Ettercap
Comment=Multipurpose sniffer/interceptor/logger
Icon=ettercap
Exec=su-to-root -c "/usr/sbin/ettercap --gtk"
Terminal=false
Categories=Network;System;Security;GTK;
X-Ubuntu-Gettext-Domain=app-install-data
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