Rkhunter 122 arquivos suspeitos; eu tenho um problema?

Question

Eu sou novo no Ubuntu. Eu estou usando o Xfce Ubuntu 14.04 LTS. Eu corri rkhunter algumas semanas de idade e só tenho alguns avisos. O fórum disse que eles eram normais. Mas, desta vez, rkhunter relatou 122 advertências. Por favor, informe.

casey@Shaman:~$ sudo rkhunter -c
[ Rootkit Hunter version 1.4.0 ]

Checking system commands...

  Performing 'strings' command checks
    Checking 'strings' command                               [ OK ]

  Performing 'shared libraries' checks
    Checking for preloading variables                        [ None found ]
    Checking for preloaded libraries                         [ None found ]
    Checking LD_LIBRARY_PATH variable                        [ Not found ]

  Performing file properties checks
    Checking for prerequisites                               [ Warning ]
    /usr/sbin/adduser                                        [ Warning ]
    /usr/sbin/chroot                                         [ Warning ]
    /usr/sbin/cron                                           [ OK ]
    /usr/sbin/groupadd                                       [ Warning ]
    /usr/sbin/groupdel                                       [ Warning ]
    /usr/sbin/groupmod                                       [ Warning ]
    /usr/sbin/grpck                                          [ Warning ]
    /usr/sbin/nologin                                        [ Warning ]
    /usr/sbin/pwck                                           [ Warning ]
    /usr/sbin/rsyslogd                                       [ Warning ]
    /usr/sbin/useradd                                        [ Warning ]
    /usr/sbin/userdel                                        [ Warning ]
    /usr/sbin/usermod                                        [ Warning ]
    /usr/sbin/vipw                                           [ Warning ]
    /usr/bin/awk                                             [ Warning ]
    /usr/bin/basename                                        [ Warning ]
    /usr/bin/chattr                                          [ Warning ]
    /usr/bin/cut                                             [ Warning ]
    /usr/bin/diff                                            [ Warning ]
    /usr/bin/dirname                                         [ Warning ]
    /usr/bin/dpkg                                            [ Warning ]
    /usr/bin/dpkg-query                                      [ Warning ]
    /usr/bin/du                                              [ Warning ]
    /usr/bin/env                                             [ Warning ]
    /usr/bin/file                                            [ Warning ]
    /usr/bin/find                                            [ Warning ]
    /usr/bin/GET                                             [ Warning ]
    /usr/bin/groups                                          [ Warning ]
    /usr/bin/head                                            [ Warning ]
    /usr/bin/id                                              [ Warning ]
    /usr/bin/killall                                         [ OK ]
    /usr/bin/last                                            [ Warning ]
    /usr/bin/lastlog                                         [ Warning ]
    /usr/bin/ldd                                             [ Warning ]
    /usr/bin/less                                            [ OK ]
    /usr/bin/locate                                          [ OK ]
    /usr/bin/logger                                          [ Warning ]
    /usr/bin/lsattr                                          [ Warning ]
    /usr/bin/lsof                                            [ OK ]
    /usr/bin/mail                                            [ OK ]
    /usr/bin/md5sum                                          [ Warning ]
    /usr/bin/mlocate                                         [ OK ]
    /usr/bin/newgrp                                          [ Warning ]
    /usr/bin/passwd                                          [ Warning ]
    /usr/bin/perl                                            [ Warning ]
    /usr/bin/pgrep                                           [ Warning ]
    /usr/bin/pkill                                           [ Warning ]
    /usr/bin/pstree                                          [ OK ]
    /usr/bin/rkhunter                                        [ OK ]
    /usr/bin/rpm                                             [ Warning ]
    /usr/bin/runcon                                          [ Warning ]
    /usr/bin/sha1sum                                         [ Warning ]
    /usr/bin/sha224sum                                       [ Warning ]
    /usr/bin/sha256sum                                       [ Warning ]
    /usr/bin/sha384sum                                       [ Warning ]
    /usr/bin/sha512sum                                       [ Warning ]
    /usr/bin/size                                            [ Warning ]
    /usr/bin/sort                                            [ Warning ]
    /usr/bin/stat                                            [ Warning ]
    /usr/bin/strace                                          [ Warning ]
    /usr/bin/strings                                         [ Warning ]
    /usr/bin/sudo                                            [ Warning ]
    /usr/bin/tail                                            [ Warning ]
    /usr/bin/test                                            [ Warning ]
    /usr/bin/top                                             [ Warning ]
    /usr/bin/touch                                           [ Warning ]
    /usr/bin/tr                                              [ Warning ]
    /usr/bin/uniq                                            [ Warning ]
    /usr/bin/users                                           [ Warning ]
    /usr/bin/vmstat                                          [ Warning ]
    /usr/bin/w                                               [ Warning ]
    /usr/bin/watch                                           [ Warning ]
    /usr/bin/wc                                              [ Warning ]
    /usr/bin/wget                                            [ Warning ]
    /usr/bin/whatis                                          [ Warning ]
    /usr/bin/whereis                                         [ Warning ]
    /usr/bin/which                                           [ OK ]
    /usr/bin/who                                             [ Warning ]
    /usr/bin/whoami                                          [ Warning ]
    /usr/bin/unhide.rb                                       [ Warning ]
    /usr/bin/mawk                                            [ Warning ]
    /usr/bin/lwp-request                                     [ Warning ]
    /usr/bin/heirloom-mailx                                  [ OK ]
    /usr/bin/w.procps                                        [ Warning ]
    /sbin/depmod                                             [ Warning ]
    /sbin/fsck                                               [ Warning ]
    /sbin/ifconfig                                           [ Warning ]
    /sbin/ifdown                                             [ Warning ]
    /sbin/ifup                                               [ Warning ]
    /sbin/init                                               [ Warning ]
    /sbin/insmod                                             [ Warning ]
    /sbin/ip                                                 [ Warning ]
    /sbin/lsmod                                              [ Warning ]
    /sbin/modinfo                                            [ Warning ]
    /sbin/modprobe                                           [ Warning ]
    /sbin/rmmod                                              [ Warning ]
    /sbin/route                                              [ Warning ]
    /sbin/runlevel                                           [ Warning ]
    /sbin/sulogin                                            [ Warning ]
    /sbin/sysctl                                             [ Warning ]
    /bin/bash                                                [ Warning ]
    /bin/cat                                                 [ Warning ]
    /bin/chmod                                               [ Warning ]
    /bin/chown                                               [ Warning ]
    /bin/cp                                                  [ Warning ]
    /bin/date                                                [ Warning ]
    /bin/df                                                  [ Warning ]
    /bin/dmesg                                               [ Warning ]
    /bin/echo                                                [ Warning ]
    /bin/ed                                                  [ OK ]
    /bin/egrep                                               [ Warning ]
    /bin/fgrep                                               [ Warning ]
    /bin/fuser                                               [ OK ]
    /bin/grep                                                [ Warning ]
    /bin/ip                                                  [ Warning ]
    /bin/kill                                                [ Warning ]
    /bin/less                                                [ OK ]
    /bin/login                                               [ Warning ]
    /bin/ls                                                  [ Warning ]
    /bin/lsmod                                               [ Warning ]
    /bin/mktemp                                              [ Warning ]
    /bin/more                                                [ Warning ]
    /bin/mount                                               [ Warning ]
    /bin/mv                                                  [ Warning ]
    /bin/netstat                                             [ Warning ]
    /bin/ping                                                [ Warning ]
    /bin/ps                                                  [ Warning ]
    /bin/pwd                                                 [ Warning ]
    /bin/readlink                                            [ Warning ]
    /bin/sed                                                 [ Warning ]
    /bin/sh                                                  [ Warning ]
    /bin/su                                                  [ Warning ]
    /bin/touch                                               [ Warning ]
    /bin/uname                                               [ Warning ]
    /bin/which                                               [ OK ]
    /bin/kmod                                                [ Warning ]
    /bin/dash                                                [ Warning ]

[Press <ENTER> to continue]


Checking for rootkits...

  Performing check of known rootkit files and directories
    55808 Trojan - Variant A                                 [ Not found ]
    ADM Worm                                                 [ Not found ]
    AjaKit Rootkit                                           [ Not found ]
    Adore Rootkit                                            [ Not found ]
    aPa Kit                                                  [ Not found ]
    Apache Worm                                              [ Not found ]
    Ambient (ark) Rootkit                                    [ Not found ]
    Balaur Rootkit                                           [ Not found ]
    BeastKit Rootkit                                         [ Not found ]
    beX2 Rootkit                                             [ Not found ]
    BOBKit Rootkit                                           [ Not found ]
    cb Rootkit                                               [ Not found ]
    CiNIK Worm (Slapper.B variant)                           [ Not found ]
    Danny-Boy's Abuse Kit                                    [ Not found ]
    Devil RootKit                                            [ Not found ]
    Dica-Kit Rootkit                                         [ Not found ]
    Dreams Rootkit                                           [ Not found ]
    Duarawkz Rootkit                                         [ Not found ]
    Enye LKM                                                 [ Not found ]
    Flea Linux Rootkit                                       [ Not found ]
    Fu Rootkit                                               [ Not found ]
    Fuck'it Rootkit                                          [ Not found ]
    GasKit Rootkit                                           [ Not found ]
    Heroin LKM                                               [ Not found ]
    HjC Kit                                                  [ Not found ]
    ignoKit Rootkit                                          [ Not found ]
    IntoXonia-NG Rootkit                                     [ Not found ]
    Irix Rootkit                                             [ Not found ]
    Jynx Rootkit                                             [ Not found ]
    KBeast Rootkit                                           [ Not found ]
    Kitko Rootkit                                            [ Not found ]
    Knark Rootkit                                            [ Not found ]
    ld-linuxv.so Rootkit                                     [ Not found ]
    Li0n Worm                                                [ Not found ]
    Lockit / LJK2 Rootkit                                    [ Not found ]
    Mood-NT Rootkit                                          [ Not found ]
    MRK Rootkit                                              [ Not found ]
    Ni0 Rootkit                                              [ Not found ]
    Ohhara Rootkit                                           [ Not found ]
    Optic Kit (Tux) Worm                                     [ Not found ]
    Oz Rootkit                                               [ Not found ]
    Phalanx Rootkit                                          [ Not found ]
    Phalanx2 Rootkit                                         [ Not found ]
    Phalanx2 Rootkit (extended tests)                        [ Not found ]
    Portacelo Rootkit                                        [ Not found ]
    R3dstorm Toolkit                                         [ Not found ]
    RH-Sharpe's Rootkit                                      [ Not found ]
    RSHA's Rootkit                                           [ Not found ]
    Scalper Worm                                             [ Not found ]
    Sebek LKM                                                [ Not found ]
    Shutdown Rootkit                                         [ Not found ]
    SHV4 Rootkit                                             [ Not found ]
    SHV5 Rootkit                                             [ Not found ]
    Sin Rootkit                                              [ Not found ]
    Slapper Worm                                             [ Not found ]
    Sneakin Rootkit                                          [ Not found ]
    'Spanish' Rootkit                                        [ Not found ]
    Suckit Rootkit                                           [ Not found ]
    Superkit Rootkit                                         [ Not found ]
    TBD (Telnet BackDoor)                                    [ Not found ]
    TeLeKiT Rootkit                                          [ Not found ]
    T0rn Rootkit                                             [ Not found ]
    trNkit Rootkit                                           [ Not found ]
    Trojanit Kit                                             [ Not found ]
    Tuxtendo Rootkit                                         [ Not found ]
    URK Rootkit                                              [ Not found ]
    Vampire Rootkit                                          [ Not found ]
    VcKit Rootkit                                            [ Not found ]
    Volc Rootkit                                             [ Not found ]
    Xzibit Rootkit                                           [ Not found ]
    zaRwT.KiT Rootkit                                        [ Not found ]
    ZK Rootkit                                               [ Not found ]

[Press <ENTER> to continue]


  Performing additional rootkit checks
    Suckit Rookit additional checks                          [ OK ]
    Checking for possible rootkit files and directories      [ None found ]
    Checking for possible rootkit strings                    [ None found ]

  Performing malware checks
    Checking running processes for suspicious files          [ None found ]
    Checking for login backdoors                             [ None found ]
    Checking for suspicious directories                      [ None found ]
    Checking for sniffer log files                           [ None found ]

  Performing Linux specific checks
    Checking loaded kernel modules                           [ OK ]
    Checking kernel module names                             [ OK ]

[Press <ENTER> to continue]


Checking the network...

  Performing checks on the network ports
    Checking for backdoor ports                              [ None found ]
    Checking for hidden ports                                [ Skipped ]

  Performing checks on the network interfaces
    Checking for promiscuous interfaces                      [ None found ]

Checking the local host...

  Performing system boot checks
    Checking for local host name                             [ Found ]
    Checking for system startup files                        [ Found ]
    Checking system startup files for malware                [ None found ]

  Performing group and account checks
    Checking for passwd file                                 [ Found ]
    Checking for root equivalent (UID 0) accounts            [ None found ]
    Checking for passwordless accounts                       [ None found ]
    Checking for passwd file changes                         [ Warning ]
    Checking for group file changes                          [ Warning ]
    Checking root account shell history files                [ None found ]

  Performing system configuration file checks
    Checking for SSH configuration file                      [ Not found ]
    Checking for running syslog daemon                       [ Found ]
    Checking for syslog configuration file                   [ Found ]
    Checking if syslog remote logging is allowed             [ Not allowed ]

  Performing filesystem checks
    Checking /dev for suspicious file types                  [ Warning ]
    Checking for hidden files and directories                [ Warning ]

[Press <ENTER> to continue]



System checks summary
=====================

File properties checks...
    Required commands check failed
    Files checked: 137
    Suspect files: 122

Rootkit checks...
    Rootkits checked : 291
    Possible rootkits: 0

Applications checks...
    All checks skipped

The system checks took: 5 minutes and 11 seconds

All results have been written to the log file (/var/log/rkhunter.log)

    

Answer 1

Obrigado pela ajuda. sudo rkhunter --propupd corrigiu o problema.

System checks summary
=====================

File properties checks...
    Files checked: 137
    Suspect files: 1

Rootkit checks...
    Rootkits checked : 291
    Possible rootkits: 0

Applications checks...
    All checks skipped

The system checks took: 1 minute and 53 seconds

This is the suspect file from the file property check
  /usr/bin/unhide.rb                                       [ Warning ]

Vou fazer algumas pesquisas, mas acredito que não seja um problema.