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    SubjectRe: Question about 'Hidden' Directories in ext2
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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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