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PHP malware scanner
===================
Traversing directories for files with php extensions and testing files against text or regexp rules, the rules based on self gathered samples and publicly vailable malwares/webshells.
The goal is to find infected files and fight against kiddies, because to easy to bypass rules.
How to use?
-----------
```
$ php ./scan.php -h
Usage scan.php -d <directory> [-e=.php] [--hide-ok] [--hide-whitelist]
-d Directory for searching
-e=.php Extension
--hide-ok Hide OK aka not infected messages
--hide-whitelist Hide whitelisted messages
```
Whitelisting
------------
See [whitelist.txt](https://github.com/scr34m/php-malware-scanner/blob/master/whitelist.txt) file for a predefined MD5 hash list. Only the first 32 characters are used, rest of the line ignored so feel free to leave a comment.
Resources
---------
* [PHPScanner](https://github.com/PHPScannr/phpFUS)
* [PMF - PHP Malware Finder](https://github.com/nbs-system/php-malware-finder)
* [check regexp online](http://www.phpliveregex.com)
* [malware samples 1](https://github.com/nbs-system/php-malware-finder/tree/master/php-malware-finder/samples)
* [malware samples 2](https://github.com/r4v/php-exploits)
* [malware samples 3](https://github.com/nikicat/web-malware-collection)
Licensing
---------
PHP malware scanner is [licensed](https://github.com/scr34m/php-malware-scanner/blob/master/LICENSE.txt) under the GNU General Public License v3.

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<?php
/*
* Copyright (c) 2016 Gabor Gyorvari
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class MalwareScanner
{
const ANSI_GREEN = "\033[32m";
const ANSI_RED = "\033[31m";
const ANSI_YELLOW = "\033[33m";
const ANSI_OFF = "\033[0m";
private $extension = '.php';
private $flagHideOk = false;
private $flagHideWhitelist = false;
private $whitelist = array();
private $stat = array(
'directories' => 0,
'files_scanned' => 0,
'files_infected' => 0,
);
public function __construct()
{
$options = getopt('hd:e::', array('hide-ok', 'hide-whitelist'));
if (isset($options['h'])) {
$this->showHelp();
} else {
if (isset($options['e'])) {
$ext = $options['e'];
if ($ext[0] != '.') {
$ext = '.' . $ext;
}
$this->extension = $ext;
}
if (isset($options['hide-ok'])) {
$this->flagHideOk = true;
}
if (isset($options['hide-whitelist'])) {
$this->flagHideWhitelist = true;
}
if (isset($options['d'])) {
$this->run($options['d']);
} else {
$this->out(MalwareScanner::ANSI_RED, 'ER', 'No directory specified');
$this->showHelp();
}
}
}
public function run($dir)
{
$dir = rtrim($dir, '/');
if (!is_dir($dir)) {
$this->out(self::ANSI_RED, 'ER', 'Specified path is not a directory: ' . $dir);
exit(-1);
}
$start = time();
$this->loadWhitelist();
$this->process($dir . '/');
$this->report($start, $dir . '/');
}
private function loadWhitelist()
{
if (!is_file(__DIR__ . '/whitelist.txt')) {
return;
}
$fp = fopen(__DIR__ . '/whitelist.txt', 'r');
while (!feof($fp)) {
$line = fgets($fp);
$this->whitelist[] = substr($line, 0, 32);
}
}
private function inWhitelist($hash)
{
return in_array($hash, $this->whitelist);
}
private function process($dir)
{
$dh = opendir($dir);
if (!$dh) {
return;
}
$this->stat['directories']++;
while (($file = readdir($dh)) !== false) {
if ($file == '.' || $file == '..') {
continue;
}
if (is_dir($dir . $file)) {
$this->process($dir . $file . '/');
} elseif (is_file($dir . $file)) {
$ext = substr($file, strrpos($file, '.'));
if ($ext == $this->extension) {
$this->scan($dir . $file);
}
}
}
closedir($dh);
}
private function report($start, $dir)
{
$end = time();
echo 'Start time: ' . strftime('%Y-%m-%d %H:%M:%S', $start) . PHP_EOL;
echo 'End time: ' . strftime('%Y-%m-%d %H:%M:%S', $end) . PHP_EOL;
echo 'Total execution time: ' . ($end - $start) . PHP_EOL;
echo 'Base directory: ' . $dir . PHP_EOL;
echo 'Total directories scanned: ' . $this->stat['directories'] . PHP_EOL;
echo 'Total files scanned: ' . $this->stat['files_scanned'] . PHP_EOL;
echo 'Total malware identified: ' . $this->stat['files_infected'] . PHP_EOL;
}
private function scan($path)
{
$this->stat['files_scanned']++;
$fileContent = file_get_contents($path);
$found = false;
// check against simple text matches
$patterns = array(
'uname -a',
'/etc/shadow',
'/etc/passwd',
'WSOstripslashes',
'PD9waHA', // <?php
'c3lzdGVt',
'\x73\x79\x73\x74\x65\x6d' /* case, dec/hex issue? */, // system
'cHJlZ19yZXBsYWNl',
'\x70\x72\x65\x67\x5f\x72\x65\x70\x6c\x61\x63\x65' /* case, dec/hex issue? */, // preg_replace
'ZXhlYyg',
'\x65\x78\x65\x63' /* dec/hex issue? */, // exec
'=\'base\'.(32*2).\'_de\'.\'code\'',
'"base64_decode"',
'YmFzZTY0X2RlY29kZ', // base64_decode
/* 'eval', 'eval(', */
'ev\x61l',
'\x65\166\x61\154\x28' /* dec/hex issue? */,
'\x65\x76\x61\x6C' /* case, dec/hex issue? */,
'ZXZhbCg', // eval
'eval(base64_decode(',
'\x47\x4c\x4f\x42\x41LS', // GLOBALS
'SFRUUF9VU0VSX0FHRU5U', // HTTP_USER_AGENT
'YWxsb3dfdXJsX2ZvcGVu', // allow_url_fopen
'${${', // ${${"\x47\x4c\x4f\x42...
'file_get_contents(\'http://codepad.org',
'PHPJiaMi',
/* too open? */
'md5($_GET[', // md5($_GET["ms-load"])
);
foreach ($patterns as $toSearch) {
$substrCount = substr_count($fileContent, $toSearch);
if ($substrCount > 0) {
$found = true;
break;
}
}
// check against regexp patterns
if (!$found) {
$patterns = array(
'eval\/\*[a-z0-9]+\*\/',
// eval/*aw3*/
'eval\([a-z0-9]{4,}\(\$[a-z0-9]{4,}, \$[0-9a-z]{4,}\)\);',
// eval(v5JONDD($v5EKGVD, $vX3Z3DE));
'(chr\(\d+\)\.){4,}',
// chr(22).chr(33).chr(22).chr(22)
'(\$[a-z0-9]{3,}\[\d+\]\.){4,}',
// $saz98[5].$saz98[2].$saz98[1].$saz98[3].$saz98[5]
'chr\(\d+\)\.""\.""\.""\.""\.""',
// chr(88)."".""."".""."".
'\$GLOBALS\[\$GLOBALS[\'[a-z0-9]{4,}\'\]\[\d+\]\.\$GLOBALS\[\'[a-z-0-9]{4,}\'\]\[\d+\].',
// $GLOBALS[$GLOBALS['u101c7'][77].$GLOBALS['u101c7'][47].
'\$GLOBALS\[\'[a-z0-9]{5,}\'\] = \$[a-z]+\d+\[\d+\]\.\$[a-z]+\d+\[\d+\]\.\$[a-z]+\d+\[\d+\]\.\$[a-z]+\d+\[\d+\]\.',
// $GLOBALS['qjyxw29'] = $z26[1].$z26[30].$z26[2].
'eval\([a-z0-9_]+\(base64_decode\(',
// eval(xxtea_decrypt(base64_decode(
'\$[a-z]{3,}=\$[a-z]{3,}\("",\$[a-z]{3,}\);\$[a-z]{3,}\(\);',
// $ewn=$ner("",$iqkpi);$ewn();
'{\s*eval\s*\(\s*\$',
// {eval($
);
foreach ($patterns as $toSearch) {
if (preg_match('/' . $toSearch . '/is', $fileContent)) {
$found = true;
break;
}
}
}
if (!$found) {
if (!$this->flagHideOk) {
$this->out(self::ANSI_GREEN, 'OK', $path);
}
return false;
}
// file hash is on whithelist hash then skip
$hash = md5($fileContent);
if ($found && $this->inWhitelist($hash)) {
if (!$this->flagHideWhitelist) {
$this->out(self::ANSI_YELLOW, 'WL', $path);
}
return false;
}
if ($found) {
$this->stat['files_infected']++;
$this->out(self::ANSI_RED, 'ER', $path . ' -> ' . $toSearch . ' ' . $hash);
}
return true;
}
private function out($color, $serv, $text)
{
echo $color . ' ' . $serv . ' ' . self::ANSI_OFF . $text . PHP_EOL;
}
private function showHelp()
{
echo 'Usage scan.php -d <directory> [-e=.php] [--hide-ok] [--hide-whitelist]' . PHP_EOL;
echo ' -d Directory for searching' . PHP_EOL;
echo ' -e=.php Extension' . PHP_EOL;
echo ' --hide-ok Hide OK aka not infected messages' . PHP_EOL;
echo ' --hide-whitelist Hide whitelisted messages' . PHP_EOL;
}
}
new MalwareScanner();

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808a427ba07643d4deaf4dfdcf418e6d wp-includes/class-json.php
60468ee875f1a005008edaa573cf573b wp-includes/functions.php
67a0f4e33e2e3f8e4d6011e8bfdbbc3b mod_templatechooser.php
a7e015a2085227ad95f5f5a6297452ee admin.trash.html.php
e2723c200270f2effd67b4781c520fde admin.events.html.php
8edd98ba2bf1ef851798fcaa0e6b297c com_joomlaxplorer/libraries/Archive/Writer/Zip.php
7ff5a64c2f22419308bcbc22f72eae96 com_joomlaxplorer/libraries/Archive/Predicate/Custom.php
a7a44b247630fee8d7fc20249c72e26d PEAR.php
5ab95e30525ab196c45f7dbfc1625083 com_joomlaxplorer/libraries/lib_zip.php
9cb0169a8305b362fe9a13f4ea08f1f1 admin.menumanager.html.php
123de131caa0f2b9570f6720e6710d04 geshi/php.php
0fd1b837fed4fcaedf3ae469fa4a0781 pcl/zip.lib.php
6a8d1fe91a1f34a7533ffe3a98145b9f pcl/pclzip.lib.php
17226e93e2b740844ce1ccb71da5f728 domit/xml_domit_xpath.php
ff5377c902545fbde188dbd49947eb9c class.ezpdf.php
a93613b6acf4cc90ce0b47298f564211 patTemplate/patTemplate/Modifier/Expression.php
f43cb20a9f9b629c24c835bf1f9851a6 PEAR/PEAR.php
0a25de138e3db72c29a56e97c98820fd mod_naplement.php
bf18aba9b916a5cc48ae8790793419bc wp-content/plugins/contact-form-7-to-database-extension/CFDBFilterParser.php
3db2e647a23035f1c3ddef601b5dae18 wp-content/plugins/wp-filebase/classes/Item.php
d539f65804806585a7ed470f46465333 wp-content/plugins/wp-filebase/classes/TplLib.php
a6cce6be28fd8c451e54280aaa88bfcc wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/datamapper/package.module.datamapper.php
6d9afe2a2e7ecf99ba71ef327989c0a1 wp-content/plugins/nextgen-gallery/pope/lib/class.extensibleobject.php
834d22f8b68a2c5c01866a43eb24efc4 wp-admin/includes/class-pclzip.php
16312a9542e3f4fc39dcbde1ac5dcb33 wp-includes/class-json.php
73e90cd5d7580cba2f599d39f9351865 wp-includes/functions.php
e9cf6421fe6afc7b724bf0372697e1c4 wp-includes/formatting.php -> (chr\(\d+\)\.){4,}
eb034c991aee49aa232f6d50372f8b4a wp-content/themes/enfold/framework/php/function-set-avia-frontend.php -> (\$[a-z0-9]{3,}\[\d+\]\.){4,}
5311094f43c7252b22c71fd4dee43f03 wp-includes/formatting.php -> (chr\(\d+\)\.){4,}
d2865536f339150ee54a81811ca80128 wp-includes/rss.php -> (\$[a-z0-9]{3,}\[\d+\]\.){4,}