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±¾ÎÄÖ÷Òª½éÉÜlinuxϵͳϼì²ârootkitµÄÁ½ÖÖ¹¤¾ß: Rootkit HunterºÍChkrootkit.

Rootkit Hunter

ÖÐÎÄÃû½Ð¡±RootkitÁÔÊÖ¡±, ¿ÉÒÔ·¢ÏÖ´óÔ¼58¸öÒÑÖªµÄrootkitsºÍһЩÐá̽Æ÷ºÍºóÃųÌÐò. Ëüͨ¹ýÖ´ÐÐһϵÁеIJâÊԽű¾À´È·ÈÏÄãµÄ»úÆ÷ÊÇ·ñÒѾ­¸ÐȾrootkits. ±ÈÈç¼ì²érootkitsʹÓõĻù±¾Îļþ, ¿ÉÖ´Ðжþ½øÖÆÎļþµÄ´íÎóÎļþȨÏÞ, ¼ì²âÄÚºËÄ£¿éµÈµÈ. Rootkit HunterÓÉMichael Boelen¿ª·¢, ÊÇ¿ªÔ´(GPL)Èí¼þ.
°²×°Rootkit Hunter·Ç³£¼òµ¥, ´ÓÍøÕ¾ÏÂÔØÈí¼þ°ü, ½âѹ, È»ºóÒÔrootÓû§Éí·ÝÔËÐÐinstaller.sh½Å±¾.
³É¹¦°²×°ºó, Äã¿ÉÒÔͨ¹ýÔËÐÐÏÂÃæÃüÁîÀ´¼ì²âÄãµÄ»úÆ÷ÊÇ·ñÒѸÐȾrootkit:
# rkhunter -c
¶þ½øÖÆ¿ÉÖ´ÐÐÎļþrkhunter±»°²×°µ½/usr/local/binĿ¼, ÄãÐèÒªÒÔrootÉí·ÝÀ´ÔËÐиóÌÐò. ³ÌÐòÔËÐкó, ËüÖ÷ÒªÖ´ÐÐÏÂÃæһϵÁеIJâÊÔ:
1. MD5УÑé²âÊÔ, ¼ì²âÈκÎÎļþÊÇ·ñ¸Ä¶¯.
2. ¼ì²ârootkitsʹÓõĶþ½øÖƺÍϵͳ¹¤¾ßÎļþ.
3. ¼ì²âÌØÂåÒÁľÂí³ÌÐòµÄÌØÕ÷Âë.
4. ¼ì²â´ó¶à³£ÓóÌÐòµÄÎļþÒì³£ÊôÐÔ.
5. Ö´ÐÐһЩϵͳÏà¹ØµÄ²âÊÔ - ÒòΪrootkit hunter¿ÉÖ§³Ö¶à¸öϵͳƽ̨.
6. ɨÃèÈκλìÔÓģʽϵĽӿںͺóÃųÌÐò³£ÓõĶ˿Ú.
7. ¼ì²âÈç/etc/rc.d/Ŀ¼ÏµÄËùÓÐÅäÖÃÎļþ, ÈÕÖ¾Îļþ, ÈκÎÒì³£µÄÒþ²ØÎļþµÈµÈ. ÀýÈç, ÔÚ¼ì²â/dev/.udevºÍ/etc/.pwd.lockÎļþʱºò, ÎÒµÄϵͳ±»¾¯¸æ.
8. ¶ÔһЩʹÓó£Óö˿ڵÄÓ¦ÓóÌÐò½øÐа汾²âÊÔ. Èç: Apache Web Server, ProcmailµÈ.
Íê³ÉÉÏÃæ¼ì²âºó, ÄãµÄÆÁÄ»»áÏÔʾɨÃè½á¹û: ¿ÉÄܱ»¸ÐȾµÄÎļþ, ²»ÕýÈ·µÄMD5УÑéÎļþºÍÒѱ»¸ÐȾµÄÓ¦ÓóÌÐò.
ÔÚÎҵĻúÆ÷ÉÏ, ɨÃèÓÃÁË175Ãë. ȱʡÇé¿öÏÂ, rkhunter¶Ôϵͳ½øÐÐÒÑÖªµÄһЩ¼ì²â. µ«ÊÇÄãÒ²¿ÉÒÔͨ¹ýʹÓá¯-scan-knownbad-files¡¯À´Ö´ÐÐδ֪µÄ´íÎó¼ì²â:
# rkhunter -c -scan-knownbad-files
rkhunterÊÇͨ¹ýÒ»¸öº¬ÓÐrootkitÃû×ÖµÄÊý¾Ý¿âÀ´¼ì²âϵͳµÄrootkits©¶´, ËùÒÔ¾­³£¸üиÃÊý¾Ý¿â·Ç³£ÖØÒª, Äã¿ÉÒÔͨ¹ýÏÂÃæÃüÁîÀ´¸üиÃÊý¾Ý¿â:
# rkhunter -update
µ±È»×îºÃÊÇͨ¹ýcron job¶¨ÆÚÖ´ÐÐÉÏÃæµÄÃüÁî, ÄãÐèÒªÓÃrootÓû§Ìí¼ÓÏÂÃæÃüÁîµ½crontabÎļþ:
59 23 1 * * echo ¡°Rkhunter update check in progress¡±;/usr/local/bin/rkhunter -update
ÉÏÃæÒ»ÐиæËßcron³ÌÐòÔÚÿÔµÚÒ»ÌìµÄÏÂÎç11:59·ÖÖ´ÐÐrkhunterÊý¾Ý¿â¸üй¤×÷, ¶øÇÒÄãµÄrootÓû§»áÊÕµ½Ò»·â½á¹û֪ͨÓʼþ.

Chkrootkit

ChkrootkitÓÉNelson MuriloºÍKlaus Steding Jessen¿ª·¢. ÓëRootkit Hunter³ÌÐò²»Í¬µÄÊÇ, chrootkit²»ÐèÒªinstaller°²×°³ÌÐò, ÄãÖ»Ðè½â¿ªÈí¼þ°üºóÖ´ÐÐchrootkit¼´¿É, È»ºó½«¶ÔһЩ¶þ½øÖÆÎļþ½øÐÐһϵÁеIJâÊÔ, ³ýÁËÓëRootkit HunterÏàͬµÄ²âÊÔÍâ, Chkrootkit»¹¶ÔһЩÖØÒªµÄ¶þ½øÖÆÎļþ½øÐмì²â, ±ÈÈçËÑË÷ÈëÇÖÕßÒѸü¸ÄÈÕÖ¾ÎļþµÄÌØÕ÷ÐÅÏ¢µÈµÈ. ¶øÇÒ, Èç¹ûÄãÏëÁгöÒѾ­²âÊÔµÄËùÓÐÏîÄ¿, Äã¿ÉÒÔÔËÐдøÓС¯-l¡¯²ÎÊýµÄÃüÁî:
# chkrootkit -l
ÔÚ²âÊÔ¹ý³ÌÖÐ, Èç¹ûÄãÏëÔÚÆÁÄ»ÉÏ¿´µ½¸ü¶àÓÐÓõÄÐÅÏ¢, Ö´ÐÐÏÂÃæÃüÁî:
# chkrootkit -x
chkrootkit½«ÔÚר¼Òģʽ(expert mode)ÔËÐÐ.
ÔÚLinuxÉÏ×éºÏʹÓÃRootkit HunterºÍChkrootkit¹¤¾ßÊǼì²ârootkis²»´íµÄ°ì·¨.
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