[Dshield] Major screwup on my part - any help out there?

Chew, Freeland (Roanoke) FChew at ecpi.edu
Mon Nov 26 18:25:15 GMT 2001


I have no experience with this hack but this is something I kept from a
previous posting.

Hope it helps

Buddy Chew


If this is old news to anyone, I apologize.  This had been a problem 
  > for me to solve and I thought I'd share what I found out, in case anyone

  > else runs into this. 
  > 
  >       I'd written a while back advising that I'd been hacked and my web 
  > server was doing double duty as a "warez" server.  I hadn't realized 
  > anything was amiss until it caught the Nimda virus.  While scrolling 
  > through the subdirectories, I found a huge amount of disk space was
being 
  > eaten up by these warez files.  Getting rid of the files and directories

  > takes some doing. 
  > 
  >       What happened in my case (this is my second warez attack) is that 
  > the hackers will usually create a subdirectory that looks perfectly 
  > normal, unless you look closer.  In my case, they called it _vti_pvt. 
  > Then under this they usually create a ton of subdirectories.  Inevitably

  > one of them will look something like this: 
  > 
  >       d:\inetpub\wwwroot\_vti_txt\tagged\by\###morpheus###\com1. 
  > 
  >       Usually they're much deeper than that, but you get the idea.  They

  > bury the "com1" deep because that prevents you from deleting anything in

  > between. Both UNIX and Windows NT Server store each node (such as "comp"

  > and "Unix" and "com1") as a separate directory. "Com1" is a reserved
word 
  > in Windows NT, making it difficult to remove.  Also they'll throw in a
few 
  > blank spaces, just to make it harder to get rid of.  So, in my example 
  > above, they appended a few spaces at the end of "com1" making it "com1
" 
  > - just looking at it, it only looks like "com1".  This will become more 
  > important later. 
  > 
  > 
  >       Opening up a command prompt, navigate to the suspect
sub-directory. 
  > From there, run DIR, using the /X switch.  This gives you 8.3 equivalent

  > of the long filename.  So, our "com1  " will look something like this:\ 
  > 
  >       09/19/2001 11:48a <DIR> COM1~002  com1 
  > 
  >       This is important, because to delete the file, you'll need that 
  > COM1~002 name to do it.  If you try to delete "com1", NT can't find that

  > file and you get an error message. 
  > 
  >       I had to use the POSIX utilities in Microsoft Windows NT Server
4.0 
  > Resource Kit to kill those directories. I just needed the command rmdir
- 
  > a simple solution once I figured out which command to use.  I later
found 
  > another way to eliminate the hacked directories. Issue the command: 
  > 
  >       RD
\\?\d:\inetpub\wwwroot\_vti_txt\tagged\by\###morpheus###\com1~002 
  > 
  >       Substitute the offending name, com1, prn, etc. The \\?\ tells RD
to 
  > use POSIX support when dealing with this file and directory.  One other 
  > thing, since they like to use long strings of characters for
subdirectory 
  > names, rename as many of them as you can.  It just makes it easier to
get 
  > rid of them.  So, you could rename the stuff above to something eaiser
to 
  > type, like: 
  > 
  >       RD \\?\d:\inetpub\wwwroot\1\2\3\4\com1~002 
  > 
  >       To empty out the files, I used DEL d:\inetpub\wwwroot\_vti_txt\*.*

  > /S - the /S switch tells DEL to take out everything in every
subdirectory 
  > and that part pretty much works as advertised.  I had trouble with one 
  > bizarre file, but the RD procedure above took care of that one.  I'm not

  > sure what they did to it to make it harder to delete, I'm just glad it's

  > gone. 
  > 



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