| エンタープライズ：特集 | 2003/03/11 17:23:00 更新 |
rootkitによるハッキングとその防御
第3回 rootkit検出ツールによる検査 (4/6)
chkrootkitでの検査について
chkrootkitの利用方法は非常に簡単ではあるが、前述したように既知のrootkitやトロイの木馬を検出には有効なものの、新しいタイプのrootkitなどでは検出されない可能性もある。これはchkrootkitで検査できる、ログの改ざんの検出についても同様だ。しかし、今回のように、検出項目にある既知のrootkitが使用されて感染している場合には、chkrootkitによる検査は有効であり、定期的なチェックを行っておくのもひとつの手だろう。
■Cronへ登録し、定期的にチェックを行うex.毎日朝の3時に検査を行い管理者へその結果をメールする
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0 3 * * * (cd /path/to/chkrootkit; ./chkrootkit 2>&1 | mail -s "chkrootkit output" root)
※/path/to/chkrootkitはchkrootkitへのパスを記述する。 |
ほかのrootkitでの検査結果
これまではtuxkitでの検査結果しか見ていないため、一例として「t0rnkit v8」の亜種である（作者いわくt0rnkit v8のバグフィックス）「shkit v4」というrootkitをインストールしたRedHat 8.0での検査結果を記しておく。
■RedHat 8.0にshkit v4（t0rnkit v8の亜種）をインストールした後にchkrootkitにて検査した結果、t0rn's v8 defaultsにて検出されている。# ./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 `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 infected Checking `grep'... not infected Checking `hdparm'... not infected Checking `su'... not infected Checking `ifconfig'... INFECTED Checking `inetd'... not tested Checking `inetdconf'... not found Checking `identd'... not found Checking `killall'... not infected Checking `ldsopreload'... not infected Checking `login'... INFECTED Checking `ls'... not infected Checking `lsof'... not infected Checking `mail'... not infected Checking `mingetty'... not infected Checking `netstat'... not infected Checking `named'... not infected Checking `passwd'... not infected Checking `pidof'... not infected Checking `pop2'... not found Checking `pop3'... not found Checking `ps'... not infected Checking `pstree'... 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 infected 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 `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... Possible t0rn v8 (or variation) rootkit installed 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/perl5/5.8.0/i386-linux-thread-multi/.packlist /usr/lib/perl5 /site_perl/5.8.0/i386-linux-thread-multi/auto/NKF/.packlist 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... Warning: Possible Showtee Rootkit installed 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 ... /usr/include/file.h /usr/include/proc.h Searching for anomalies in shell history files... nothing found Checking `asp'... not infected Checking `bindshell'... not infected Checking `lkm'... You have 33 process hidden for ps command Warning: Possible LKM Trojan installed Checking `rexedcs'... not found Checking `sniffer'... eth0 is not promisc Checking `wted'... nothing deleted Checking `scalper'... not infected Checking `slapper'... not infected Checking `z2'... nothing deleted |
[TTS，ITmedia]
