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???????????? ???????[ 2014/9/24 14:36:55 ] ????????Linux ??????
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??????????Linux???3??????????κ?????????
????1???????????
??????????????????????????????й?????????????????????????????????????????????????????????100M????????????????ж??????????????????????????Centos5.5?汾??????????80??22????
?????????????????????????????????????????????????????????100M????????????????????п???????????????????????????????????????????????
????2??????????
??????????????????????????????÷?????????????????????????????????????????80????????????????????????“netstat –an”????????????????м?飬???????????з????κ???80???????????????????????“ps –ef”??“top”?????????з????κο?????????????????????????rootkit??
????????????????????rootkit?????????????????μ?ps??top?????????????????汾?????????????????md5sumУ?飬?????????????????μ???????????????????????????????????????????????????rootkit???????????
????3????????????
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????????????????????????????????п?????????????????????
????more /var/log/secure |grep Accepted
????????????????????????????????????????????
????Oct 3 03:10:25 webserver sshd[20701]: Accepted password for mail from 62.17.163.186 port 53349 ssh2
????????????????10??3????賿3??10????и?mail????62.17.163.186???IP????????????mail?????????????????????????????е???????????62.17.163.186???IP??????????????????????????????????mail??????????????????????????????????????????
?????????????????????/etc/shadow???????????????
????mail:$1$kCEd3yD6$W1evaY5BMPQIqfTwTVJiX1:15400:0:99999:7:::
???????????mail????????????????????????????????????????????mail??????????????????????????????????ε???????????????ε??????
?????????????????????????/var/log/messages??/var/log/wtmp?????????????????????????????????????????????????????/var/log/secure??????????????
????4?????????
??????????????????????????????и?mail??????????????????????λ??′???????????????????????????????????????????????????滻????????????ps????????????е?????????????μ?????
????nobody 22765 1 6 Sep29 ? 4-00:11:58 .t
???????.t??????????????????top??????????£?
????PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
????22765 nobody 15 0 1740m 1362m 1228 S 98.3 91.5 2892:19 .t
?????????????????t?????????????4?????????????????????nobody????????????t???????????????????cpu???????????????????????????????????????????????????????t????????PID?22765????????????PID????????г????·????????
????????????????????PID????exe??????????
????[root@webserver ~]# /mnt/bin/ls -al /proc/22765/exe
????lrwxrwxrwx 1 root root 0 Sep 29 22:09 /proc/22765/exe -> /var/tmp/…/apa/t
??????
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