对一些 PHP 代码进行反混淆 [已关闭]

问题描述 投票：0回答：3

我正在尝试对这段 PHP 代码进行反混淆：

<?php if(!function_exists("TC9A16C47DA8EEE87")){function TC9A16C47DA8EEE87($T059EC46CFE335260){$T059EC46CFE335260=base64_decode($T059EC46CFE335260);$TC9A16C47DA8EEE87=0;$TA7FB8B0A1C0E2E9E=0;$T17D35BB9DF7A47E4=0;$T65CE9F6823D588A7=(ord($T059EC46CFE335260[1])<<8)+ord($T059EC46CFE335260[2]);$TBF14159DC7D007D3=3;$T77605D5F26DD5248=0;$T4A747C3263CA7A55=16;$T7C7E72B89B83E235="";$T0D47BDF6FD9DDE2E=strlen($T059EC46CFE335260);$T43D5686285035C13=__FILE__;$T43D5686285035C13=file_get_contents($T43D5686285035C13);$T6BBC58A3B5B11DC4=0;preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"),$T43D5686285035C13,$T6BBC58A3B5B11DC4);for(;$TBF14159DC7D007D3<$T0D47BDF6FD9DDE2E;){if(count($T6BBC58A3B5B11DC4)) exit;if($T4A747C3263CA7A55==0){$T65CE9F6823D588A7=(ord($T059EC46CFE335260[$TBF14159DC7D007D3++])<<8);$T65CE9F6823D588A7+=ord($T059EC46CFE335260[$TBF14159DC7D007D3++]);$T4A747C3263CA7A55=16;}if($T65CE9F6823D588A7&0x8000){$TC9A16C47DA8EEE87=(ord($T059EC46CFE335260[$TBF14159DC7D007D3++])<<4);$TC9A16C47DA8EEE87+=(ord($T059EC46CFE335260[$TBF14159DC7D007D3])>>4);if($TC9A16C47DA8EEE87){$TA7FB8B0A1C0E2E9E=(ord($T059EC46CFE335260[$TBF14159DC7D007D3++])&0x0F)+3;for($T17D35BB9DF7A47E4=0;$T17D35BB9DF7A47E4<$TA7FB8B0A1C0E2E9E;$T17D35BB9DF7A47E4++)$T7C7E72B89B83E235[$T77605D5F26DD5248+$T17D35BB9DF7A47E4]=$T7C7E72B89B83E235[$T77605D5F26DD5248-$TC9A16C47DA8EEE87+$T17D35BB9DF7A47E4];$T77605D5F26DD5248+=$TA7FB8B0A1C0E2E9E;}else{$TA7FB8B0A1C0E2E9E=(ord($T059EC46CFE335260[$TBF14159DC7D007D3++])<<8);$TA7FB8B0A1C0E2E9E+=ord($T059EC46CFE335260[$TBF14159DC7D007D3++])+16;for($T17D35BB9DF7A47E4=0;$T17D35BB9DF7A47E4<$TA7FB8B0A1C0E2E9E;$T7C7E72B89B83E235[$T77605D5F26DD5248+$T17D35BB9DF7A47E4++]=$T059EC46CFE335260[$TBF14159DC7D007D3]);$TBF14159DC7D007D3++;$T77605D5F26DD5248+=$TA7FB8B0A1C0E2E9E;}}else $T7C7E72B89B83E235[$T77605D5F26DD5248++]=$T059EC46CFE335260[$TBF14159DC7D007D3++];$T65CE9F6823D588A7<<=1;$T4A747C3263CA7A55--;if($TBF14159DC7D007D3==$T0D47BDF6FD9DDE2E){$T43D5686285035C13=implode("",$T7C7E72B89B83E235);$T43D5686285035C13="?".">".$T43D5686285035C13;return $T43D5686285035C13;}}}}eval(TC9A16C47DA8EEE87("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"));?>

现在通过使用 PHP 格式化程序，我成功地使其显示清晰。

<?php
if (!function_exists("TC9A16C47DA8EEE87")) {
    function TC9A16C47DA8EEE87($T059EC46CFE335260)
    {
        $T059EC46CFE335260 = base64_decode($T059EC46CFE335260);
        $TC9A16C47DA8EEE87 = 0;
        $TA7FB8B0A1C0E2E9E = 0;
        $T17D35BB9DF7A47E4 = 0;
        $T65CE9F6823D588A7 = (ord($T059EC46CFE335260[1]) << 8) + ord($T059EC46CFE335260[2]);
        $TBF14159DC7D007D3 = 3;
        $T77605D5F26DD5248 = 0;
        $T4A747C3263CA7A55 = 16;
        $T7C7E72B89B83E235 = "";
        $T0D47BDF6FD9DDE2E = strlen($T059EC46CFE335260);
        $T43D5686285035C13 = __FILE__;
        $T43D5686285035C13 = file_get_contents($T43D5686285035C13);
        $T6BBC58A3B5B11DC4 = 0;
        preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $T43D5686285035C13, $T6BBC58A3B5B11DC4);
        for (; $TBF14159DC7D007D3 < $T0D47BDF6FD9DDE2E; ) {
            if (count($T6BBC58A3B5B11DC4))
                exit;
            if ($T4A747C3263CA7A55 == 0) {
                $T65CE9F6823D588A7 = (ord($T059EC46CFE335260[$TBF14159DC7D007D3++]) << 8);
                $T65CE9F6823D588A7 += ord($T059EC46CFE335260[$TBF14159DC7D007D3++]);
                $T4A747C3263CA7A55 = 16;
            }
            if ($T65CE9F6823D588A7 & 0x8000) {
                $TC9A16C47DA8EEE87 = (ord($T059EC46CFE335260[$TBF14159DC7D007D3++]) << 4);
                $TC9A16C47DA8EEE87 += (ord($T059EC46CFE335260[$TBF14159DC7D007D3]) >> 4);
                if ($TC9A16C47DA8EEE87) {
                    $TA7FB8B0A1C0E2E9E = (ord($T059EC46CFE335260[$TBF14159DC7D007D3++]) & 0x0F) + 3;
                    for ($T17D35BB9DF7A47E4 = 0; $T17D35BB9DF7A47E4 < $TA7FB8B0A1C0E2E9E; $T17D35BB9DF7A47E4++)
                        $T7C7E72B89B83E235[$T77605D5F26DD5248 + $T17D35BB9DF7A47E4] = $T7C7E72B89B83E235[$T77605D5F26DD5248 - $TC9A16C47DA8EEE87 + $T17D35BB9DF7A47E4];
                    $T77605D5F26DD5248 += $TA7FB8B0A1C0E2E9E;
                } else {
                    $TA7FB8B0A1C0E2E9E = (ord($T059EC46CFE335260[$TBF14159DC7D007D3++]) << 8);
                    $TA7FB8B0A1C0E2E9E += ord($T059EC46CFE335260[$TBF14159DC7D007D3++]) + 16;
                    for ($T17D35BB9DF7A47E4 = 0; $T17D35BB9DF7A47E4 < $TA7FB8B0A1C0E2E9E; $T7C7E72B89B83E235[$T77605D5F26DD5248 + $T17D35BB9DF7A47E4++] = $T059EC46CFE335260[$TBF14159DC7D007D3]);
                    $TBF14159DC7D007D3++;
                    $T77605D5F26DD5248 += $TA7FB8B0A1C0E2E9E;
                }
            } else
                $T7C7E72B89B83E235[$T77605D5F26DD5248++] = $T059EC46CFE335260[$TBF14159DC7D007D3++];
            $T65CE9F6823D588A7 <<= 1;
            $T4A747C3263CA7A55--;
            if ($TBF14159DC7D007D3 == $T0D47BDF6FD9DDE2E) {
                $T43D5686285035C13 = implode("", $T7C7E72B89B83E235);
                $T43D5686285035C13 = "?" . ">" . $T43D5686285035C13;
                return $T43D5686285035C13;
            }
        }
    }
}
eval(TC9A16C47DA8EEE87("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"));
?>

现在我想在文件末尾的 eval 函数中查看 Base64 文本。通过使用这个工具，我可以让它看到一些东西，但不准确。

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这就是我被困住的地方。还能如何对其进行编码或压缩？

php deobfuscation
3个回答
7
投票

为了解码它，我从函数中间删除了 

exit
，然后将 
eval
更改为 
print
。以下是结果（
eval
下的代码）：

?><div class="derecha mini">explorer v.0.0.4</div>
<h3>Explorer</h3>
<?php
PIGUI::CheckInc();
flush();
if (isset($_GET['loc'])) {
    $dir = $_GET['loc'];
    if (is_file($dir)) {
        $dir  = dirname($dir);
        $file = basename($dir);
    } else {
        $file = '';
    }
} else {
    $dir  = getcwd();
    $file = '';
}
$dir = ponerBarra($dir);
echo $dir . '<br /><br />';
$dirs  = array();
$files = array();
$arr   = scandir($dir ? $dir : '.');
sort($arr);
foreach ($arr as $item) {
    if ($item != '.') {
        if (is_dir($dir . $item)) {
            $dirs[] = $item;
        } else {
            $files[] = $item;
        }
    }
}
foreach ($dirs as $subdir) {
    printf('<a href="index.php?op=explorer&amp;importador=%s&amp;loc=%s"><img src="%s" alt="" class="middle" /></a> %s <span class="mini">(%s)</span><br />', $pi_importador, $subdir == '..' ? dirname($dir) : $dir . PIGUI::HtmlEntities($subdir), PIGUI::Icon('folder.png', 16, true, true), $subdir, substr(sprintf('%o', fileperms($dir . $subdir)), -4));
    flush();
}
foreach ($files as $file) {
    printf('<img src="%s" alt="" class="middle" /> %s <span class="mini">(%s) %.2f Kb</span><br />', PIGUI::Icon('page.png', 16, true, true), $file, substr(sprintf('%o', fileperms($dir . $file)), -4), filesize($dir . $file) / 1024);
    flush();
}
?>

编辑：这是您的原始代码，大部分已进行反混淆处理。不幸的是，我不认识加密算法：

<?php
function decrypt($source)
{
    $file = file_get_contents(__FILE__);
    $match = 0;
    preg_match("/(print|sprint|echo)/", $file, $match);
    // protection against deobfuscation:            
    // if this file was modified to contain "print", exit            
    if (count($match)) exit;

    $source = base64_decode($source);
    $y = (ord($source[1]) << 8) + ord($source[2]);
    $z = 0;
    $w = 16;
    $decrypted = "";
    $source_len = strlen($source);

    for ($char_no = 3; $char_no < $source_len; ) {
        if ($w == 0) {
            $y = (ord($source[$char_no++]) << 8);
            $y += ord($source[$char_no++]);
            $w = 16;
        }
        if ($y & 0x8000) {
            $t = (ord($source[$char_no++]) << 4);
            $t += (ord($source[$char_no]) >> 4);
            if ($t) {
                $x = (ord($source[$char_no++]) & 0x0F) + 3;
                for ($i = 0; $i < $x; $i++)
                    $decrypted[$z + $i] = $decrypted[$z - $t + $i];
                $z += $x;
            } else {
                $x = (ord($source[$char_no++]) << 8);
                $x += ord($source[$char_no++]) + 16;
                for ($i = 0; $i < $x; )
                    $decrypted[$z + $i++] = $source[$char_no];
                $char_no++;
                $z += $x;
            }
        } else {
            $decrypted[$z++] = $source[$char_no++];
        }
        $y <<= 1;
        $w--;
    }

    return "?" . ">" . implode("", $decrypted);
}
print (decrypt("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"));
?>
2
投票

似乎原始发帖者想看看被感染后对他们的网站造成了哪些损害。有效询问如何消除混乱。

整个代码是 PHP 恶意软件。

很可能注入到基于 PHP 的网站上。充满 Base64 内容的整个奇怪函数就是有效负载。奇怪的跳跃是原始编码人员决定掩盖他们的代码的方式。

如果您确实想查看输出，请查看开头的 

function
和末尾的 
eval
：主要 
function
的名称为 has/odd/garbage 
TC9A16C47DA8EEE87
。知道了这一点，那么最后一行应该更改为：

echo TC9A16C47DA8EEE87("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");

这将为您提供有效负载的纯 base64。过去了，不太清楚。也许进一步的base64解码？我已经面临B.S.以前也这样，但从来都不愉快。

如果你真的很害怕，请在一台安全的机器上解码，你不介意在此过程中被冲洗。但我的猜测是，这主要只是恶意软件的破坏行为，而不是挖掘比如何引起基本破坏行为更深层次的秘密。

1
投票

理解

TC9A16C47DA8EEE87
中的神秘变换并不重要。此方法的目的是从输入字符串（base64 编码）生成可执行 PHP 代码，然后将其传递给 eval。

您可以尝试使用 

TC9A16C47DA8EEE87("QAAAPGRpdiBjbGFzcz...
而不是 
echo
来打印 
eval
的返回值，而不是尝试解码输入字符串。

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