/usr/share/kde4/config/virus_wallpaper.knsrc is in plasma-wallpapers-addons 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [KNewStuff2]
ProvidersUrl=http://download.kde.org/khotnewstuff/wallpaper-providers.xml
StandardResource=wallpaper
CachePolicy=resident
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