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SubjectRe: Question about 'Hidden' Directories in ext2
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 -> on the box?

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