Messages in this thread | | | Date | Wed, 3 Apr 2002 01:48:28 +0200 | From | Erik Ljungström <> | Subject | Re: Question about 'Hidden' Directories in ext2 |
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On Tue, 2 Apr 2002 17:16:42 -0500 (EST) "Calin A. Culianu" <calin@ajvar.org> 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... > > -Calin > > > -
This isn't really my area of expertice, but have you also recovered the original crond ? Perhaps that was compromized as well, and a replacement of the binaries are crontabbed? Search your system for copies of ls, netstat, ps, whatever. This is just a thought that hit me when I read this.
I wish you all of luck in recovering your system(s)
-- Best regards, Erik - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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