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jedchecker/administrator/components/com_jedchecker/libraries/rules/jamss.php

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<?php
/**
* @package Joomla.JEDChecker
*
* @copyright Copyright (C) 2017 - 2019 Open Source Matters, Inc. All rights reserved.
* Copyright (C) 2008 - 2016 fasterjoomla.com. All rights reserved.
* @author Riccardo Zorn <support@fasterjoomla.com>
* Bernard Toplak <bernard@orion-web.hr>
*
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die('Restricted access');
// Include the rule base class
require_once JPATH_COMPONENT_ADMINISTRATOR . '/models/rule.php';
/**
* JedcheckerRulesJamss
*
* @since 2014-02-23
* Attempts to identify deprecated code, unsafe code, leftover stuff
*/
class JedcheckerRulesJamss extends JEDcheckerRule
{
/**
* The formal ID of this rule. For example: SE1.
*
* @var string
*/
protected $id = 'Jamss';
/**
* The title or caption of this rule.
*
* @var string
*/
protected $title = 'COM_JEDCHECKER_RULE_JAMSS';
/**
* The description of this rule.
*
* @var string
*/
protected $description = 'COM_JEDCHECKER_RULE_JAMSS_DESC';
protected $ext;
protected $patterns;
protected $jamssFileNames;
/**
* Initiates the file search and check
*
* @return void
*/
public function check()
{
$files = JFolder::files($this->basedir, '', true, true);
$this->init_jamss();
foreach ($files as $file)
{
$this->find($file);
}
}
/**
* reads a file and searches for any function defined in the params
*
* @param string $file The file name
*
* @return boolean True if the statement was found, otherwise False.
*/
protected function find($file)
{
$content = (array) file($file);
$result = false;
$this->scan_file($file);
return $result;
}
/**
* This will initialize the local variables for use by jamss.
* In order to make this easy to update, no syntax changes are applied. Just store the variables in the object
* for faster use.
*
* @param bool $deepscan Merge the $jamssDeepSearchStrings
*
* @return void
*/
private function init_jamss($deepscan = true)
{
/*
* START OF JAMSS CODE (approx line 76)
*/
/* * * * * Patterns Start * * * * */
$jamssStrings = 'r0nin|m0rtix|upl0ad|r57shell|c99shell|shellbot|phpshell|void\.ru|';
$jamssStrings .= 'phpremoteview|directmail|bash_history|multiviews|cwings|vandal|bitchx|';
$jamssStrings .= 'eggdrop|guardservices|psybnc|dalnet|undernet|vulnscan|spymeta|raslan58|';
$jamssStrings .= 'Webshell|str_rot13|FilesMan|FilesTools|Web Shell|ifrm|bckdrprm|';
$jamssStrings .= 'hackmeplz|wrgggthhd|WSOsetcookie|Hmei7|Inbox Mass Mailer|HackTeam|Hackeado';
$jamssStrings .= 'Janissaries|Miyachung|ccteam|Adminer|OOO000000|$GLOBALS|findsysfolder';
// These patterns will be used if GET parameter ?deepscan=1 is set while calling jamss.php file
$jamssDeepSearchStrings = 'eval|base64_decode|base64_encode|gzdecode|gzdeflate|';
$jamssDeepSearchStrings .= 'gzuncompress|gzcompress|readgzfile|zlib_decode|zlib_encode|';
$jamssDeepSearchStrings .= 'gzfile|gzget|gzpassthru|iframe|strrev|lzw_decompress|strtr';
$jamssDeepSearchStrings .= 'exec|passthru|shell_exec|system|proc_|popen';
// The patterns to search for
$jamssPatterns = array(
array('preg_replace\s*\(\s*[\"\']\s*(\W)(?-s).*\1[imsxADSUXJu\s]*e[imsxADSUXJu\s]*[\"\'].*\)',
// [0] = RegEx search pattern
'PHP: preg_replace Eval',
// [1] = Name / Title
'1',
// [2] = number
'Detected preg_replace function that evaluates (executes) mathed code. ' .
'This means if PHP code is passed it will be executed.',
// [3] = description
'Part example code from http://sucuri.net/malware/backdoor-phppreg_replaceeval'),
// [4] = More Information link
array('c999*sh_surl',
'Backdoor: PHP:C99:045',
'2',
'Detected the "C99? backdoor that allows attackers to manage (and reinfect) your site remotely. ' .
'It is often used as part of a compromise to maintain access to the hacked sites.',
'http://sucuri.net/malware/backdoor-phpc99045'),
array('preg_match\s*\(\s*\"\s*/\s*bot\s*/\s*\"',
'Backdoor: PHP:R57:01',
'3',
'Detected the "R57? backdoor that allows attackers to access, modify and reinfect your site. ' .
'It is often hidden in the filesystem and hard to find without access to the server or logs.',
'http://sucuri.net/malware/backdoor-phpr5701'),
array('eval[\s/\*\#]*\(stripslashes[\s/\*\#]*\([\s/\*\#]*\$_(REQUEST|POST|GET)\s*\[\s*\\\s*[\'\"]\s*asc\s*\\\s*[\'\"]',
'Backdoor: PHP:GENERIC:07',
'5',
'Detected a generic backdoor that allows attackers to ' .
'upload files, delete files, access, modify and/or reinfect your site. ' .
'It is often hidden in the filesystem and hard to find without access to the server or logs. ' .
'It also includes uploadify scripts and similars that offer upload options without security. ',
'http://sucuri.net/malware/backdoor-phpgeneric07'),
/*array('https?\S{1,63}\.ru',
'russian URL',
'6',
'Detected a .RU domain link, as there are many attacks leading the innocent visitors to .RU pages.
Maybe i\'s valid link, but we leave it to you to check this out.',
),*/
array('preg_replace\s*\(\s*[\"\'\”]\s*/\s*\.\s*\*\s*/\s*e\s*[\"\'\”]\s*,\s*[\"\'\”]\s*\\x65\\x76\\x61\\x6c',
'Backdoor: PHP:Filesman:02',
'7',
'Detected the “Filesman” backdoor that allows attackers to access, modify and reinfect your site. ' .
'It is often hidden in the filesystem and hard to find without access to the server or logs.',
'http://sucuri.net/malware/backdoor-phpfilesman02'),
array('(include|require)(_once)*\s*[\"\'][\w\W\s/\*]*php://input[\w\W\s/\*]*[\"\']',
'PHP:\input include',
'8',
'Detected the method of reading input through PHP protocol handler in include/require statements.',),
array('data:;base64',
'data:;base64 include',
'9',
'Detected the method of executing base64 data in include.',),
array('RewriteCond\s*%\{HTTP_REFERER\}',
'.HTACCESS RewriteCond-Referer',
'10',
'Your .htaccess file has a conditional redirection based on "HTTP Referer". ' .
'This means it redirects according to site/url from where your visitors came to your site. ' .
'Such technique has been used for unwanted redirections after coming from Google or other search engines, ' .
'so check this directive carefully.',),
array('brute\s*force',
'"Brute Force" words',
'11',
'Detected the "Brute Force" words mentioned in code. <u>Sometimes it\'s a "false positive"</u> because ' .
'several developers like to mention it in they code, but it\'s worth double-checking if this file ' .
'is untouched (eg. compare it with one in original extension package).'),
array('GIF89a.*[\r\n]*.*<\?php',
'PHP file desguised as GIF image',
'15',
'Detected a PHP file that was most probably uploaded as an image via webform that loosely only checks ' .
'file headers.',),
array('\$ip[\w\W\s/\*]*=[\w\W\s/\*]*getenv\(["\']REMOTE_ADDR["\']\);[\w\W\s/\*]*[\r\n]\$message',
'Probably malicious PHP script that "calls home"',
'16',
'Detected script variations often used to inform the attackers about found vulnerable website.',),
array('(?:(?:eval|gzuncompress|gzinflate|base64_decode|str_rot13|strrev|strtr|rawurldecode|' .
'assert|unpack|urldecode)[\s/\*\w\W\(]*){2,}',
'PHP: multiple encoded, most probably obfuscated code found',
'17',
'This pattern could be used in highly encoded, malicious code hidden under a loop of code obfuscation function ' .
'calls. In most cases the decoded hacker code goes through an eval call to execute it. ' .
'This pattern is also often used for legitimate purposes, e.g. storing configuration information or ' .
'serialised object data. ' .
'Please inspect the file manually and compare it with the one in the original extension or ' .
'Joomla package to verify that this is not a false positive.',
'Thanks to Dario Pintarić (dario.pintaric[et}orion-web.hr for this report!'),
array('<\s*iframe',
'IFRAME element',
'18',
'Found IFRAME element in code. It\'s mostly benevolent, but often used for bad stuff, ' .
'so please check if it\'s a valid code.'),
array('strrev[\s/\*\#]*\([\s/\*\#]*[\'"]\s*tressa\s*[\'"]\s*\)',
'Reversed string "assert"',
'19',
'Assert function name is being hidden behind strrev().'),
array('is_writable[\s/\*\#]*\([\s/\*\#]*getcwd',
'Is the current DIR Writable?',
'20',
'This could be harmless, but used in some malware'),
array('(?:\\\\x[0-9A-Fa-f]{1,2}|\\\\[0-7]{1,3}){2,}',
'At least two characters in hexadecimal or octal notation',
'21',
'Found at least two characters in hexadecimal or octal notation. It doesn\'t mean it is malicious, ' .
'but it could be code hidding behind such notation.'),
array('\$_F\s*=\s*__FILE__\s*;\s*\$_X\s*=',
'SourceCop encoded code',
'22',
'Found the SourceCop encoded code. It is often used for malicious code ' .
'hiding, so go and check the code with some online SourceCop decoders'),
array('\b(?:exec|passthru|shell_exec|system|proc_\w+|popen)\b[\w\W\s/\*]*\([\s/\*\#\'\"\w\W\-\_]*(?:\$_GET|\$_POST)',
'shell command execution from POST/GET variables',
'23',
'Found direct shell command execution getting variables from POST/GET, ' .
'which is highly dangerous security flaw or a part of malicious webrootkit'),
array('\$\w[\w\W\s/\*]*=[\w\W\s/\*]*`.*`',
'PHP execution operator: backticks (``)',
'24',
'PHP execution operator found. Note that these are not single-quotes! ' .
'PHP will attempt to execute the contents of the backticks as a shell ' .
'command, which might indicate a part of a webrootkit'),
);
$jamssFileNames = array(
'Probably an OpenFlashChart library demo file that has known input validation error (CVE-2009-4140)'
=> 'ofc_upload_image.php',
'Probably an R57 shell'
=> 'r57.php',
'PhpInfo() file? It is advisable to remove such file, as it could reveal too
much info to potential attackers'
=> 'phpinfo.php',
);
/* * * * * Patterns End * * * * */
// Check if DeepScan should be done
if (isset($_GET['deepscan']))
{
$patterns = array_merge($jamssPatterns, explode('|', $jamssStrings), explode('|', $jamssDeepSearchStrings));
}
else
{
$patterns = array_merge($jamssPatterns, explode('|', $jamssStrings));
}
/*
* END OF JAMSS CODE (approx line 203)
*/
$this->patterns = $patterns;
$this->jamssFileNames = $jamssFileNames;
$valid_extensions = explode('|', $this->params->get('fileExt'));
$this->ext = $valid_extensions;
}
/**
* Scan given file for all malware patterns
*
* @param string $path path of the scanned file
*
* @return bool
*/
private function scan_file($path)
{
// Init the variables scan_file expects:
$ext = $this->ext;
$patterns = $this->patterns;
$count = 0;
$total_results = 0;
$jamssFileNames = $this->jamssFileNames;
// Removed: global $ext, $patterns, $count, $total_results, $jamssFileNames;
/**
* JAMSS Code, line 251 (all output functions were changed to conform to jedchecker output)
*/
if (in_array(pathinfo($path, PATHINFO_EXTENSION), $ext)
&& filesize($path)/* skip empty ones */
&& !stripos($path, 'jamss.php')/* skip this file */)
{
if ($malic_file_descr = array_search(pathinfo($path, PATHINFO_BASENAME), $jamssFileNames))
{
$this->jamssWarning($path, JText::_('COM_JEDCHECKER_ERROR_JAMSS_SUSPICIOUS_FILENAME'), $malic_file_descr, '', 0);
}
if (!($content = file_get_contents($path)))
{
$this->report->addError($path, JText::_('COM_JEDCHECKER_ERROR_JAMSS_CANNOT_OPEN') . $malic_file_descr, 0);
return true;
}
else
{
// Do a search for fingerprints
foreach ($patterns As $pattern)
{
if (is_array($pattern))
{
// It's a pattern
// RegEx modifiers: i=case-insensitive; s=dot matches also newlines; S=optimization
preg_match_all('#' . $pattern[0] . '#isS', $content, $found, PREG_OFFSET_CAPTURE);
}
else
{
// It's a string
preg_match_all('#' . $pattern . '#isS', $content, $found, PREG_OFFSET_CAPTURE);
}
// Remove outer array from results
$all_results = $found[0];
// Count the number of results
$results_count = count($all_results);
// Total results of all fingerprints
$total_results += $results_count;
// Added to avoid notices.
$first_line = 0;
$first_code = "";
if (!empty($all_results))
{
$count++;
if (is_array($pattern))
{
// Then it has some additional comments
foreach ($all_results as $match)
{
// Output the line of malware code, but sanitize it before
// The offset is in $match[1]
$first_code = substr($content, $match[1], 200);
$first_line = $this->calculate_line_number($match[1], $content);
break;
}
$this->jamssWarning(
$path,
JText::_('COM_JEDCHECKER_ERROR_JAMSS_PATTERN') . "#$pattern[2] - $pattern[1]",
$pattern[3],
$first_code,
$first_line
);
}
else
{
// It's a string, no comments available
$first_content = "";
foreach ($all_results as $match)
{
// Output the line of malware code, but sanitize it before
$first_code = substr($content, $match[1], 200);
$first_line = $this->calculate_line_number($match[1], $content);
break;
}
$this->jamssWarning(
$path,
JText::_('COM_JEDCHECKER_ERROR_JAMSS_STRING') . $pattern,
'',
$first_code,
$first_line
);
}
}
}
unset($content);
}
}
return false;
}
/**
* Calculates the line number where pattern match was found
*
* @param int $length The maximum length after the specified offset to search for the line breaks
* @param string $fileContent The file content in string format
* @param int $offset The offset where to start counting (default 0)
*
* @return int Returns line number where the subject code was found
*/
private function calculate_line_number($length, $fileContent, $offset = 0)
{
// We are counting the number of line breaks between
// the offset, and length in the file content.
// Then we add one since we get a zero
// based return value from substr_count function.
return substr_count($fileContent, "\n", $offset, $length) + 1;
}
/**
* Raise a warning and format it properly.
* jamss warnings are very helpful but very verbose; hence we chose to use of tooltips
*
* @param string $path The file name
* @param string $title The comment's title
* @param mixed $info The additional info on the error
* @param string $code The affected portion of the code
* @param int $line The line number of the first match
*
* @return void Returns nothing
*/
private function jamssWarning($path, $title, $info, $code, $line)
{
$info = !empty($info)?sprintf($this->params->get('info'), htmlentities($info, ENT_QUOTES)):"";
$code = !empty($code)?sprintf($this->params->get('code'), htmlentities($code, ENT_QUOTES)):"";
$this->report->addWarning($path, $info . $code . $title, $line);
}
}
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