Find running binary executables that were not installed using dpkg

cat /var/lib/dpkg/info/*.list > /tmp/listin ; ls /proc/*/exe |xargs -l readlink | grep -xvFf /tmp/listin; rm /tmp/listin
This helped me find a botnet that had made into my system. Of course, this is not a foolproof or guarantied way to find all of them or even most of them. But it helped me find it.

By: kamathln
2009-09-09 18:09:14

What Others Think

Great command!
bwoodacre · 605 weeks and 4 days ago
Really useful, thanks!
Patola · 605 weeks and 3 days ago
This causes the ram memory to fill up on my machine. So I did this: cat /var/lib/dpkg/info/*.list | egrep -v '\.(desktop|html|gz|xpm|png|jpg|svg|gif|css|xml|icon|glade|map|md5|tmpl|sample|h|c|rc|m4|mo|data2|ui)$' > /tmp/listin ; ls /proc/*/exe | xargs -l readlink | grep -xvFf /tmp/listin; rm /tmp/listin
Weboide · 605 weeks and 2 days ago
Well, I just realized how not foolproof this is. There was one more botnet whose directory name was just a space. (yeah that one " "). Can someone come up with a much better command (full input sanitization).
kamathln · 605 weeks and 2 days ago
Never mind my previous comment. When I was trying out again, I had missed giving the '-l' option to xargs. Weboide: please submit your command as an alternative
kamathln · 605 weeks and 2 days ago
This works on Arch Linux: ls /proc/*/exe | xargs -L1 readlink | while read line; do if ! pacman -Qo "$line" > /dev/null; then echo $line; fi;
matthewbauer · 499 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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