03-23-2012
Invaders don't want you to know your system's been compromised, so try to interfere with it as little as possible while still using it for their own purposes.
It's possible they replaced a few programs for their own purposes to resist attempts at removal(something known as 'rootkitting'). You should try something like rkhunter to see if it finds any known rootkits on your system.
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LEARN ABOUT DEBIAN
knocker
KNOCKER(1) General Commands Manual KNOCKER(1)
NAME
knocker - An easy to use network security port scanner
SYNOPSIS
knocker --host <host> [OPTION]
DESCRIPTION
knocker is a simple and easy to use TCP security port scanner written in C using pthreads which is able to analyze hosts and all of the
different services started on them.
OPTIONS
-H, --host
host name or numeric Internet address to scan
-P, --port
port number to scan (single port scan only)
-SP, --start-port
port number to begin the scan from
-EP, --end-port
port number to end the scan at
--last-host
uses the last scanned host as target
--last-scan
performs again the last port scan
-q, --quiet
disable console output and logs to file.
-lf, --logfile <logfile>
log the results to a specified file.
-nf, --no-fency
disable fency output
-nc, --no-colors
disable colored output
--configure
let the user configure knocker
-h, --help
display this help and exit
-v, --version
output version information and exit
EXAMPLES
To run this program the standard way type:
knocker --host 192.168.0.1
If you want to specify a port range to scan:
knocker --host thehost --start-port 1 --end-port 2600
or
knocker -H thehost -SP 1 -EP 2600
To scan a single port:
knocker -H thehost --port 21
To run this program not using colors (if your terminal does not support colors):
knocker --host 192.168.0.1 --no-colors
To run this program run in background and have the results written in a log file:
knocker --host 192.168.0.1 --quiet &
AVAILABILTY
The latest version of this program can be found at http://knocker.sourceforge.net
BUGS
See the BUGS file in the knocker source package for a list of known bugs. Report bugs to <g.gabriele79@genie.it>
AUTHOR
knocker is written by Gabriele Giorgetti <g.gabriele79@genie.it>
COPYRIGHT
Copyright (C) 2001,2002 Gabriele Giorgetti
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
MAY 24, 2002 KNOCKER(1)