rootkit検索/対策


システムをクラックする手段として「rootkit」というツールが存在しますが、これが仕掛けられているかいないかを、検索してくれるツールがあるみたいなので、早速インストールしてみました。

chkrootkitのインストール

portsからもインストールできますが、新しいバックドアには、新しいバージョンで対応するみたいなので、ソースからインストールしました。

入手先
http://www.chkrootkit.org/

インストール例

hoge# tar zxvf chkrootkit.tar.gz
hoge# cd chkrootkit-0.42b
hoge# make sense
makeが済むとchkrootkitというファイルができてると思うので、これを任意の位置に置いて実行させるだけでokです。
portsからインストールすると、/usr/local/sbinの中に作られます。

定期的に実行させたいので、/etc/crontabに以下の書き込みをして、実行させるようにしました。
#/usr/local/sbinにchkrootkitがあるとして(4時1分にチェック)
1	4	*	*	*	root	/usr/local/sbin/chkrootkit

チェック後のログの例・・・。
ROOTDIR is `/'
Checking `amd'... not infected
Checking `basename'... not infected
Checking `biff'... not infected
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 infected
Checking `gpm'... not found
Checking `grep'... not infected
Checking `hdparm'... not found
Checking `su'... not infected
Checking `ifconfig'... not infected
Checking `inetd'... not infected
Checking `inetdconf'... not infected
Checking `identd'... not found
Checking `init'... not infected
Checking `killall'... not infected
Checking `ldsopreload'... not tested
Checking `login'... not infected
Checking `ls'... not infected
Checking `lsof'... not found
Checking `mail'... not infected
Checking `mingetty'... not found
Checking `netstat'... not infected
Checking `named'... not infected
Checking `passwd'... not infected
Checking `pidof'... not found
Checking `pop2'... not found
Checking `pop3'... not found
Checking `ps'... not infected
Checking `pstree'... not found
Checking `rpcinfo'... not infected
Checking `rlogind'... not infected
Checking `rshd'... not infected
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 infected
Checking `timed'... not infected
Checking `traceroute'... not infected
Checking `vdir'... /usr/libexec/elf/strings: vdir: No such file or directory
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... nothing found
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 OBSD rk v1... nothing found
Searching for LOC rootkit ... nothing found
Searching for Romanian 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 anomalies in shell history files... nothing found
Checking `asp'... not infected
Checking `bindshell'... not infected
Checking `lkm'... nothing detected
Checking `rexedcs'... not found
Checking `sniffer'... 
rl0 is not promisc
ppp0 is not promisc
tun0 is not promisc
Checking `wted'... nothing deleted
Checking `w55808'... not infected
Checking `scalper'... not infected
Checking `slapper'... not infected
Checking `z2'... 
nothing deleted

まぁ、nothing foundとか出ていれば以上ないでしょう^^;
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