Re: cracking tool named 'nc' ?
From: Mathias Gygax (mg_at_trash.net)
Date: 07/11/03
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Date: Fri, 11 Jul 2003 01:22:27 +0200 To: security-basics@securityfocus.com
On Don, Jul 10, 2003 at 02:10:56 -0400, Matt Hunter wrote:
> Hi,
hi,
> I recently had my linux worstation broken into. The cracker created
> a directory and placed two executables in it. One was called 'zap' -
> which I've since found out is used to clean up log files before the
> cracker logs out. The other one was called 'nc'. I can't find any
> information on this program. Does anyone out there know what it's used for?
zap is used for cleaning utmp and wtmp login information. is rather old,
but still used. if you need the source-code of this tool, contact me
directly.
nc is netcat, primarly a programm which does the same as cat, but based
on tcp/ip sockets. you can redirect output of a programm to netcat and
pipe it rawly to a remote listening socket. netcat is also capable of
listening to incoming connections. this tool is called the "swiss army
knife" of tcp/ip networking, because of its clean design and interaction
with other un*x processes (piping and redirection is easy possible)
HTH
- regards, mathias
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