/usr/share/applications/screensavers/imsmap.desktop is in xscreensaver-data-extra 5.30-1+deb8u2.
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 | [Desktop Entry]
Name=IMSMap
Exec=/usr/lib/xscreensaver/imsmap -root
TryExec=/usr/lib/xscreensaver/imsmap
Comment=This generates random cloud-like patterns. The idea is to take four points on the edge of the image, and assign each a random "elevation". Then find the point between them, and give it a value which is the average of the other four, plus some small random offset. Coloration is done based on elevation. Written by Juergen Nickelsen and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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