ルートキット検出 chkrootkit インストール

chkrootkitインストール
[root@centos ~]# wget ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
[root@centos ~]# tar zxvf chkrootkit.tar.gz
[root@centos ~]# mkdir ~/bin
[root@centos ~]# mv chkrootkit-0.50/chkrootkit ~/bin/
[root@centos ~]# rm -f chkrootkit.tar.gz
[root@centos ~]# rm -fr chkrootkit-0.50
chkrootkit実行
[root@centos ~]# chkrootkit
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 infected
Checking `gpm'... not found
Checking `grep'... not infected
Checking `hdparm'... not found
Checking `su'... not infected
Checking `ifconfig'... not infected
Checking `inetd'... not tested
Checking `inetdconf'... not found
Checking `identd'... not found
Checking `init'... not infected
Checking `killall'... not infected
Checking `ldsopreload'... can't exec ./strings-static, not tested
Checking `login'... not infected
Checking `ls'... not infected
Checking `lsof'... not infected
Checking `mail'... not infected
Checking `mingetty'... not found
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 infected
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/.libcrypto.so.0.9.8e.hmac /usr/lib/.libcrypto.so.6.hmac /usr/lib/.libcrypto.so.1.0.1e.hmac /usr/lib/.libssl.so.0.9.8e.hmac /usr/lib/.libssl.so.1.0.1e.hmac /usr/lib/.libcrypto.so.10.hmac /usr/lib/debug/usr/.dwz /usr/lib/.libssl.so.6.hmac /usr/lib/.libssl.so.10.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... Warning: /sbin/init INFECTED
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 Linux/Ebury - Operation Windigo ssh... nothing found
Searching for 64-bit Linux Rootkit ... nothing found
Searching for 64-bit Linux Rootkit modules... nothing found
Searching for suspect PHP files... nothing found
Searching for anomalies in shell history files... nothing found
Checking `asp'... not infected
Checking `bindshell'... not infected
Checking `lkm'... not tested: can't exec
Checking `rexedcs'... not found
Checking `sniffer'... not tested: can't exec ./ifpromisc
Checking `w55808'... not infected
Checking `wted'... not tested: can't exec ./chkwtmp
Checking `scalper'... not infected
Checking `slapper'... not infected
Checking `z2'... not tested: can't exec ./chklastlog
Checking `chkutmp'... not tested: can't exec ./chkutmp
Checking `OSX_RSPLUG'... not infected

[root@centos ~]# chkrootkit | grep "INFECTED" | egrep -v "/sbin/init|bindshell" ←INFECTEDのみを抽出
[root@centos ~]# ←何も出なければ問題なし
ヒント
INFECTED(感染)と表示されなければ問題なし。
chkrootkit定期実行
[root@centos ~]# vi /etc/cron.daily/chkrootkit
#!/bin/sh

TMPFILE=`mktemp`

/root/bin/chkrootkit | grep INFECTED | egrep -v "/sbin/init|bindshell" > $TMPFILE

if [ -s $TMPFILE ]; then
	cat $TMPFILE | mail -s "chkrootkit `hostname` `date +%Y-%m-%d`" root > /dev/null
fi

rm -f $TMPFILE
[root@centos ~]# chmod +x /etc/cron.daily/chkrootkit
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