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**-Unhide-** http://www.unhide-forensics.info Unhide is a forensic tool to find hidden processes and TCP/UDP ports by rootkits / LKMs or by another hiding technique. // Unhide (unhide-linux or unhide-posix) // ------------------------------------- Detecting hidden processes. Implements six main techniques 1- Compare /proc vs /bin/ps output 2- Compare info gathered from /bin/ps with info gathered by walking thru the procfs. ONLY for unhide-linux version 3- Compare info gathered from /bin/ps with info gathered from syscalls (syscall scanning). 4- Full PIDs space ocupation (PIDs bruteforcing). ONLY for unhide-linux version 5- Compare /bin/ps output vs /proc, procfs walking and syscall. ONLY for unhide-linux version Reverse search, verify that all thread seen by ps are also seen in the kernel. 6- Quick compare /proc, procfs walking and syscall vs /bin/ps output. ONLY for unhide-linux version It's about 20 times faster than tests 1+2+3 but maybe give more false positives. // Unhide_rb // --------- It's a back port in C language of the ruby unhide.rb As the original unhide.rb, it is roughly equivalent to "unhide-linux quick reverse" : - it makes three tests less (kill, opendir and chdir), - it only run /bin/ps once at start and once for the double check, - also, its tests are less accurate (e.g.. testing return value instead of errno), - processes are only identified by their exe link (unhide-linux also use cmdline and "sleeping kernel process" name), - there's little protection against failures (failed fopen or popen by example), - there's no logging capability. It is very quick, about 80 times quicker than "unhide-linux quick reverse" // Unhide-TCP // ---------- Identify TCP/UDP ports that are listening but not listed in sbin/ss or /bin/netstat. It use two methods: - brute force of all TCP/UDP ports availables and compare with SS/netstat output. - probe of all TCP/UDP ports not reported by netstat. // Files // ----- unhide-linux.c -- Hidden processes, for Linux >= 2.6 unhide-linux.h unhide-tcp.c -- Hidden TCP/UDP Ports unhide-tcp-fast.c unhide-tcp.h unhide-output.c -- Common routines of unhide tools unhide-output.h unhide_rb.c -- C port of unhide.rb (a very light version of unhide-linux in ruby) unhide-posix.c -- Hidden processes, for generic Unix systems (*BSD, Solaris, linux 2.2 / 2.4) It doesn't implement PIDs brute forcing check yet. Needs more testing Warning : This version is somewhat outdated and may generate false positive. Prefer unhide-linux.c if you can use it. changelog -- As the name implied log of the change to unhide COPYING -- License file, GNU GPL V3 LEEME.txt -- Spanish version of this file LISEZ-MOI.TXT -- French version of this file NEWS -- Release notes README.txt -- This file sanity.sh -- unhide-linux testsuite file TODO -- Evolutions to do (any volunteers ?) man/unhide.8 -- English man page of unhide man/unhide-tcp.8 -- English man page of unhide-tcp man/fr/unhide.8 -- French man page of unhide man/fr/unhide-tcp.8 -- French man page of unhide-tcp // Compiling // --------- Build requires glibc-devel glibc-static-devel Require - unhide-tcp under linux : iproute2 net-tools (for netstat) lsof psmisc (for fuser) - unhide-tcp under freeBSD : sockstat lsof netstat unhide-linux, unhide-posix, unhide_rb : procps If you ARE using a Linux kernel >= 2.6 gcc -Wall -O2 --static -pthread unhide-linux*.c unhide-output.c -o unhide-linux gcc -Wall -O2 --static unhide_rb.c -o unhide_rb gcc -Wall -O2 --static unhide-tcp.c unhide-tcp-fast.c unhide-output.c -o unhide-tcp ln -s unhide unhide-linux Else (Linux < 2.6, *BSD, Solaris and other Unice) gcc --static unhide-posix.c -o unhide-posix ln -s unhide unhide-posix // Using // ----- You MUST be root to use unhide-linux and unhide-tcp. Examples: # ./unhide-linux -vo quick reverse # ./unhide-linux -vom procall sys # ./unhide_rb # ./unhide-tcp -flov # ./unhide-tcp -flovs // License // ------- GPL V.3 (http://www.gnu.org/licenses/gpl-3.0.html) // Greets // ------ A. Ramos (aramosf@unsec.net) for some regexps unspawn (unspawn@rootshell.be) CentOS support Martin Bowers (Martin.Bowers@freescale.com) CentOS support Lorenzo Martinez (lorenzo@lorenzomartinez.homeip.net) Some ideas to improve and betatesting Francois Marier (francois@debian.org) Author of the man pages and Debian support Johan Walles (johan.walles@gmail.com) Find and fix a very nasty race condition bug Jan Iven (jan.iven@cern.ch) Because of his great improvements, new tests and bugfixing P. Gouin (patrick-g@users.sourceforge.net) Because of his incredible work fixing bugs and improving the performance François Boisson for his idea of a double check in brute test Leandro Lucarella (leandro.lucarella@sociomantic.com) for the fast scan method and his factorization work for unhide-tcp Nikos Ntarmos (ntarmos@ceid.upatras.gr) for its invaluable help in the FreeBSD port of unhide-tcp and for packaging unhide on FreeBSD.
Source: README.txt, updated 2013-05-26

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