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How do you check the listening ports on a windows box?
Command line.
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Answer Posted / systems & network administator
I hope that headline doesn't scare you. A lot of people shun
the Windows command line in favor of more complicated
graphical user interfaces. But when it comes to
investigating malware infections, various command-line tools
can be incredibly helpful, since GUI-based tools can't
always do the job.
First off, invoke a command prompt. Go to Start --> Run and
type in 'cmd.exe.' Putting '.exe' at the end of the entry is
important; it is a far safer way of bringing up a command
prompt. To trick users, a malicious program might purposely
be called 'cmd.com,' and in such a case, the malware would
run if just 'cmd' were typed. Thus, go ahead and type
'cmd.exe' instead.
'netstat'
Next, with a command prompt going, run the netstat command
and take a gander at the listening ports on your systems. A
lot of people know that 'netstat –na' can provide a list of
TCP and UDP ports on the machine. Adding an 'o' to the
command arguments can reveal the process ID of each process
using a port. And, starting with XP SP2, an added 'b' flag
will show the EXE name using each port, along with the
dynamic link libraries (DLLs) that it has loaded to
communicate with the network. Beware of the 'b,' however.
The function can chew up some serious CPU time, tying up
between 60% and 100% of your processor for up to a minute.
But, wait, there is more. Suppose you want to look at port
usage and see how it changes over time. Adding a space and
then an integer to that netstat command, as in "netstat –nao
1", will run the command with a frequency equivalent to the
integer, in this case, for every one second. The display
will be dumped on the screen continuously, as shown below.
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