man unhide-tcp (8): forensic tool to find hidden TCP/UDP ports

SYNOPSIS

unhide-tcp [options]

DESCRIPTION

unhide-tcp is a forensic tool that identifies TCP/UDP ports that are listening but are not listed by /sbin/ss (or alternatively by /bin/netstat) through brute forcing of all TCP/UDP ports available.
Note1 : On FreeBSD ans OpenBSD, netstat is allways used as iproute2 doesn't exist on these OS. In addition, on FreeBSD, sockstat is used instead of fuser. Note2 : If iproute2 is not available on the system, option -n or -s SHOULD be given on the command line.

OPTIONS

-h --help: Display help
--brief: Don't display warning messages, that's the default behavior.
-f --fuser: Display fuser output (if available) for the hidden port On FreeBSD, instead of fuser command, displays the output of the sockstat command for the hidden port.
-l --lsof: Display lsof output (if available) for the hidden port
-n --netstat: Use /bin/netstat instead of /sbin/ss. On system with many opened ports, this can slow down the test dramatically.
-s --server: Use a very quick strategy of scanning. On system with a lot of opened ports, it is hundreds times faster than ss method and ten thousands times faster than netstat method.
-o --log: Write a log file (unhide-tcp-AAAA-MM-DD.log) in the current directory.
-V --version: Show version and exit
-v --verbose: Be verbose, display warning message (default : don't display). This option may be repeated more than once.

Exit status:

0: if no hidden port is found,
4: if one or more hidden TCP port(s) is(are) found,
8: if one or more hidden UDP port(s) is(are) found,
12: if one or more hidden TCP and UDP ports are found.

AUTHOR

This manual page was written by Francois Marier [email protected] and Patrick Gouin. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 or any later version published by the Free Software Foundation.

LICENSE