Messages in this thread | | | Subject | Re: Question about 'Hidden' Directories in ext2 | From | Craig Knox <> | Date | 03 Apr 2002 11:53:59 +0100 |
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On Tue, 2002-04-02 at 23:16, Calin A. Culianu wrote: > > Ok, so some hackers broke into one of our boxes and set up an ftp site. > They monopolized over 70gb of hard drive space with warez and porn. We > aren't really that upset about it, since we thought it was kind of funny. > (Of course we don't like the idea that they are using out bandwidth and > disk space, but we can easily remedy that). > > Anyway, the weird thing is they created 2 directories, both of which were > strangely hidden. You can cd into them but you can't ls them. I > > /usr/lib/ypx and /usr/man/ypx were the two directories that contained both > the ftp software and the ftp root. When you are in /usr/man and you do an > ls, you don't see the ypx directory (same when you are in /usr/lib). The > ls binary we got is right off the redhat cd so it shouldn't still be > compromised by whatever rootkit was installed. > > My question is this: can the data structures in ext2fs be somehow hacked > so a directory can't appear in a listing but can be otherwise located for > a stat or a chdir? I should think no.. maybe we still haven't gotten rid > of the rootkit...
If you are using the binary "ls" of the redhat CD they are probably using a kernel module to hide this directory. Have you tried running -> http://www.chkrootkit.org on the box?
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