Seguridad en Linux. Instalar chkrootkit

Un rootkit es una herramienta, o un grupo de ellas que tiene como finalidad esconderse a sí misma y esconder otros programas, procesos, archivos, directorios, claves de registro, y puertos que permiten al intruso mantener el acceso a un sistema para remotamente comandar acciones o extraer información sensible. Existen rootkits para una amplia variedad de sistemas operativos, como GNU/Linux, Solaris o Microsoft Windows.

Hay varios programas disponibles para detectar rootkits. En los sistemas basados en Unix, dos de las aplicaciones más populares son chkrootkit y rkhunter.

Chkrootkit se encuentra en los repos de fedora, así que para instalarlo es muy sencillo:

# yum install chkrootkit

Después lanzamos chkrootkit. Ejecutándolo desde consola

# chkrootkit

También se puede ejecutar desde el entorno gráfico en Aplicaciones > Herramientas del sistema > chkrootkit

Lo que se devuelve por pantalla es algo similar a esto:

ROOTDIR is `/’
Checking `amd’… not found
Checking `basename’… not infected
Checking `biff’… not found
Checking `chfn’… not infected
Checking `chsh’… not infected
Checking `cron’… not infected
Checking `crontab’… not infected
Checking `date’… not infected
Checking `du’… not infected
Checking `dirname’… not infected
Checking `echo’… not infected
Checking `egrep’… not infected
Checking `env’… not infected
Checking `find’… not infected
Checking `fingerd’… not found
Checking `gpm’… not found
Checking `grep’… not infected
Checking `hdparm’… not infected
Checking `su’… not infected
Checking `ifconfig’… not infected
Checking `inetd’… not found
Checking `inetdconf’… not found
Checking `identd’… not found
Checking `init’… not infected
Checking `killall’… not infected
Checking `ldsopreload’… not infected
Checking `login’… not infected
Checking `ls’… not infected
Checking `lsof’… not infected
Checking `mail’… not found
Checking `mingetty’… not infected
Checking `netstat’… not infected
Checking `named’… not found
Checking `passwd’… not infected
Checking `pidof’… not infected
Checking `pop2’… not found
Checking `pop3’… not found
Checking `ps’… not infected
Checking `pstree’… not infected
Checking `rpcinfo’… not found
Checking `rlogind’… not found
Checking `rshd’… not found
Checking `slogin’… not infected
Checking `sendmail’… not infected
Checking `sshd’… not infected
Checking `syslogd’… not tested
Checking `tar’… not infected
Checking `tcpd’… not infected
Checking `tcpdump’… not infected
Checking `top’… not infected
Checking `telnetd’… not found
Checking `timed’… not found
Checking `traceroute’… not infected
Checking `vdir’… not infected
Checking `w’… not infected
Checking `write’… not infected
Checking `aliens’… no suspect files
Searching for sniffer’s logs, it may take a while… nothing found
Searching for HiDrootkit’s default dir… nothing found
Searching for t0rn’s default files and dirs… nothing found
Searching for t0rn’s v8 defaults… nothing found
Searching for Lion Worm default files and dirs… nothing found
Searching for RSHA’s default files and dir… nothing found
Searching for RH-Sharpe’s default files… nothing found
Searching for Ambient’s rootkit (ark) default files and dirs… nothing found
Searching for suspicious files and dirs, it may take a while…
/usr/lib/.libfipscheck.so.1.hmac /usr/lib/.libssl.so.1.0.0c.hmac /usr/lib/.libfipscheck.so.1.1.0.hmac /usr/lib/.libssl.so.10.hmac /usr/lib/firefox-3.6/.autoreg /lib/.libcrypto.so.10.hmac /lib/.libcrypto.so.1.0.0c.hmac /lib/.libgcrypt.so.11.hmac

Searching for LPD Worm files and dirs… nothing found
Searching for Ramen Worm files and dirs… nothing found
Searching for Maniac files and dirs… nothing found
Searching for RK17 files and dirs… nothing found
Searching for Ducoci rootkit… nothing found
Searching for Adore Worm… nothing found
Searching for ShitC Worm… nothing found
Searching for Omega Worm… nothing found
Searching for Sadmind/IIS Worm… nothing found
Searching for MonKit… nothing found
Searching for Showtee… nothing found
Searching for OpticKit… nothing found
Searching for T.R.K… nothing found
Searching for Mithra… nothing found
Searching for LOC rootkit… nothing found
Searching for Romanian rootkit… nothing found
Searching for HKRK rootkit… nothing found
Searching for Suckit rootkit… nothing found
Searching for Volc rootkit… nothing found
Searching for Gold2 rootkit… nothing found
Searching for TC2 Worm default files and dirs… nothing found
Searching for Anonoying rootkit default files and dirs… nothing found
Searching for ZK rootkit default files and dirs… nothing found
Searching for ShKit rootkit default files and dirs… nothing found
Searching for AjaKit rootkit default files and dirs… nothing found
Searching for zaRwT rootkit default files and dirs… nothing found
Searching for Madalin rootkit default files… nothing found
Searching for Fu rootkit default files… nothing found
Searching for ESRK rootkit default files… nothing found
Searching for rootedoor… nothing found
Searching for ENYELKM rootkit default files… nothing found
Searching for common ssh-scanners default files… nothing found
Searching for anomalies in shell history files… Warning: `//root/.mysql_history’ file size is zero
Checking `asp’… not infected
Checking `bindshell’… not infected
Checking `lkm’… chkproc: nothing detected
chkdirs: nothing detected
Checking `rexedcs’… not found
Checking `sniffer’… eth0: PF_PACKET(/sbin/dhclient)
Checking `w55808’… not infected
Checking `wted’… chkwtmp: nothing deleted
Checking `scalper’… not infected
Checking `slapper’… not infected
Checking `z2’… chklastlog: nothing deleted
Checking `chkutmp’… chkutmp: nothing deleted
Checking `OSX_RSPLUG’… not infected

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