Read this thread - http://ubuntuforums.org/showthread.php?t=1349678
Basically, there's someone who put a .deb on gnome-look, users installed it, and now he's hacked their systems to perform a DDoS attack.
Lesson : Don't install .deb files from unreliable sources. We have repos for a reason. Use them. And for crying out loud, screensavers don't use .deb files.
Oh, and here's the fix(in case someone browsing might want to check)
sudo rm -f /usr/bin/Auto.bash /usr/bin/run.bash /etc/profile.d/gnome.sh index.php run.bash && sudo dpkg -r app5552