mirror of
https://github.com/scr34m/php-malware-scanner.git
synced 2026-06-16 12:30:35 +00:00
8122d11eff
The pattern files are large and complex enough to justify some whitespace and comments to explain what each entry is. Added logic to check if the line is empty or if the first character is equal to '#' before using it as a pattern. Simply skips over empty and commented lines.
280 lines
8.5 KiB
PHP
280 lines
8.5 KiB
PHP
<?php
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/*
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* Copyright (c) 2016 Gabor Gyorvari
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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class MalwareScanner
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{
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const ANSI_GREEN = "\033[32m";
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const ANSI_RED = "\033[31m";
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const ANSI_YELLOW = "\033[33m";
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const ANSI_OFF = "\033[0m";
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private $extension = '.php';
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private $flagHideOk = false;
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private $flagHideWhitelist = false;
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private $extraCheck = false;
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private $whitelist = array();
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private $ignore = array();
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private $stat = array(
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'directories' => 0,
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'files_scanned' => 0,
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'files_infected' => 0,
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);
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private $followSymlink = false;
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public function __construct()
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{
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$options = getopt('hd:e::i::', array('hide-ok', 'hide-whitelist', 'extra-check', 'follow-symlink'));
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if (isset($options['h'])) {
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$this->showHelp();
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} else {
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if (isset($options['e'])) {
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$ext = $options['e'];
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if ($ext[0] != '.') {
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$ext = '.' . $ext;
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}
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$this->extension = strtolower($ext);
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}
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if (isset($options['i'])) {
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$this->ignore = is_array($options['i']) ? $options['i'] : array($options['i']);
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}
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if (isset($options['hide-ok'])) {
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$this->flagHideOk = true;
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}
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if (isset($options['hide-whitelist'])) {
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$this->flagHideWhitelist = true;
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}
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if (isset($options['extra-check'])) {
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$this->extraCheck = true;
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}
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if (isset($options['follow-symlink'])) {
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$this->followSymlink = true;
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}
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if (isset($options['d'])) {
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$this->run($options['d']);
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} else {
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$this->out(MalwareScanner::ANSI_RED, 'ER', 'No directory specified');
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$this->showHelp();
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}
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}
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}
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public function run($dir)
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{
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$dir = rtrim($dir, '/');
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if (!is_dir($dir)) {
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$this->out(self::ANSI_RED, 'ER', 'Specified path is not a directory: ' . $dir);
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exit(-1);
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}
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$start = time();
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$this->loadWhitelist();
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$this->process($dir . '/');
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$this->report($start, $dir . '/');
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}
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private function loadWhitelist()
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{
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if (!is_file(__DIR__ . '/whitelist.txt')) {
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return;
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}
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$fp = fopen(__DIR__ . '/whitelist.txt', 'r');
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while (!feof($fp)) {
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$line = fgets($fp);
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$this->whitelist[] = substr($line, 0, 32);
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}
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}
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private function inWhitelist($hash)
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{
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return in_array($hash, $this->whitelist);
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}
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private function process($dir)
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{
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$dh = opendir($dir);
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if (!$dh) {
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return;
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}
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$this->stat['directories']++;
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while (($file = readdir($dh)) !== false) {
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if ($file == '.' || $file == '..') {
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continue;
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}
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if ($this->isIgnored($dir . $file)) {
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continue;
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}
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if (!$this->followSymlink && is_link($dir . $file)) {
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continue;
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}
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if (is_dir($dir . $file)) {
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$this->process($dir . $file . '/');
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} elseif (is_file($dir . $file)) {
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$ext = strtolower(substr($file, strrpos($file, '.')));
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if ($ext == $this->extension) {
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$this->scan($dir . $file);
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}
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}
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}
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closedir($dh);
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}
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private function report($start, $dir)
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{
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$end = time();
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echo 'Start time: ' . strftime('%Y-%m-%d %H:%M:%S', $start) . PHP_EOL;
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echo 'End time: ' . strftime('%Y-%m-%d %H:%M:%S', $end) . PHP_EOL;
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echo 'Total execution time: ' . ($end - $start) . PHP_EOL;
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echo 'Base directory: ' . $dir . PHP_EOL;
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echo 'Total directories scanned: ' . $this->stat['directories'] . PHP_EOL;
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echo 'Total files scanned: ' . $this->stat['files_scanned'] . PHP_EOL;
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echo 'Total malware identified: ' . $this->stat['files_infected'] . PHP_EOL;
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}
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private function loadPatterns($file)
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{
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$list = array();
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if (is_readable($file)) {
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foreach (file($file) as $pattern) {
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$list[] = trim($pattern);
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}
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}
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return $list;
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}
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private function scan($path)
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{
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$this->stat['files_scanned']++;
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$fileContent = file_get_contents($path);
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$found = false;
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$toSearch = '';
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$patterns = $this->loadPatterns(dirname(__FILE__) . '/patterns_raw.txt');
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if ($this->extraCheck) {
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array_push($patterns, "googleBot", "htaccess");
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}
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foreach ($patterns as $toSearch) {
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if (!$toSearch) {
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continue;
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}
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if ($toSearch[0] === '#') {
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continue;
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}
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$substrCount = substr_count($fileContent, $toSearch);
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if ($substrCount > 0) {
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$found = true;
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break;
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}
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}
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if (!$found) {
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$patterns = $this->loadPatterns(dirname(__FILE__) . '/patterns_re.txt');
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if (!$toSearch) {
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continue;
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}
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if ($toSearch[0] === '#') {
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continue;
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}
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foreach ($patterns as $toSearch) {
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if (preg_match('/' . $toSearch . '/is', $fileContent)) {
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$found = true;
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break;
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}
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}
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}
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if (!$found) {
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if (!$this->flagHideOk) {
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$this->out(self::ANSI_GREEN, 'OK', $path);
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}
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return false;
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}
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// file hash is on whithelist hash then skip
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$hash = md5($fileContent);
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if ($found && $this->inWhitelist($hash)) {
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if (!$this->flagHideWhitelist) {
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$this->out(self::ANSI_YELLOW, 'WL', $path);
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}
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return false;
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}
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if ($found) {
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$this->stat['files_infected']++;
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$this->out(self::ANSI_RED, 'ER', $path . ' -> ' . $toSearch . ' ' . $hash);
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}
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return true;
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}
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private function isIgnored($pathname)
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{
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foreach ($this->ignore as $pattern) {
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$match = $this->pathMatches($pathname, $pattern);
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if ($match) {
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return true;
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}
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}
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return false;
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}
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// @see http://stackoverflow.com/a/13914119
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private function pathMatches($path, $pattern, $ignoreCase = false)
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{
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$expr = preg_replace_callback(
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'/[\\\\^$.[\\]|()?*+{}\\-\\/]/',
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function ($matches) {
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switch ($matches[0]) {
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case '*':
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return '.*';
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case '?':
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return '.';
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default:
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return '\\' . $matches[0];
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}
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},
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$pattern
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);
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$expr = '/' . $expr . '/';
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if ($ignoreCase) {
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$expr .= 'i';
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}
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return (bool)preg_match($expr, $path);
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}
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private function out($color, $serv, $text)
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{
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echo $color . ' ' . $serv . ' ' . self::ANSI_OFF . $text . PHP_EOL;
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}
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private function showHelp()
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{
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echo 'Usage scan.php -d <directory> [-i=<directory|file>] [-e=.php] [--hide-ok] [--hide-whitelist]' . PHP_EOL;
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echo ' -d Directory for searching' . PHP_EOL;
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echo ' -e=.php Extension' . PHP_EOL;
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echo ' -i=<directory|file> Directory of file to igonre' . PHP_EOL;
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echo ' --hide-ok Hide OK aka not infected messages' . PHP_EOL;
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echo ' --hide-whitelist Hide whitelisted messages' . PHP_EOL;
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echo ' --extra-check Adds GoogleBot and htaccess to Scan List' . PHP_EOL;
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echo ' --follow-symlink Follow symlinked directories' . PHP_EOL;
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}
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}
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new MalwareScanner();
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