Summary of solutions for php website Trojans

This article mainly introduces the repair methods for php website Trojans, summarizes and analyzes the methods for Trojan detection and removal on Linux and Windows systems, and provides a complete Trojan search tool instance, for more information, see the examples in this article. Share it with you for your reference. The specific method is as follows:

In linux, we can use commands to search Trojan files and run the following commands in the code installation directory:

The code is as follows:

Find./-iname "*. php" | xargs grep-H-n "eval (base64_decode"

Nearly 100 results are found. this list of results is very important. all Trojans are in it. you need to open a file one by one to verify whether the results are Trojans. If yes, delete them immediately.
Finally, we found 10 Trojan files and stored them in various directories, all of which are php webshells. the functions are complete and base64-encoded.
If you search for directories in windows and use windows files, you can search for eval or recently modified files. if dedecms is used, check the latest dedecms vulnerability and fix it.

The following is a php Trojan search tool, which is directly placed in the root directory of your site.

The code is as follows:

<? Php
/************* PHP Web Trojan scanner ********************* ***/
/* [+] By alibaba */
/* [+] MSN: weeming21@hotmail.com */
/* [+] Initial release: t00ls.net. for details, refer to t00ls */
/* [+] Version: v1.0 */
/* [+] Function: php Trojan scanning tool for the web version */
/* [+] Note: the scanned file is not necessarily a backdoor ,*/
/* Determine, review, and compare the original file by yourself. */
/* If you are not sure whether the scanned file is a backdoor ,*/
/* You are welcome to send this file to me for analysis. */
/*************************************** ****************/
Ob_start ();
Set_time_limit (0 );
$ Username = "t00ls"; // Set the user name
$ Password = "t00ls"; // Set the password
$ Md5 = md5 (md5 ($ username). md5 ($ password ));
$ Version = "PHP Web Trojan scanner v1.0 ";

PHP Web Trojan scanner
$ Realpath = realpath ('./');
$ Selfpath = $ _ SERVER ['php _ SELF '];
$ Selfpath = substr ($ selfpath, 0, strrpos ($ selfpath ,'/'));
Define ('realpath', str_replace ('//', '/', str_replace ('\', '/', substr ($ REALPATH, 0, strlen ($ realpath) -strlen ($ selfpath )))));
Define ('myfile', basename (_ FILE __));
Define ('mypath', str_replace ('\', '/', dirname (_ FILE __)).'/');
Define ('myfullpath', str_replace ('\', '/', (_ FILE __)));
Define ('host', "http: //". $ _ SERVER ['http _ host']);
?>


<? Php echo $ version?>




<? Php
If (! (Isset ($ _ COOKIE ['t00ls']) & $ _ COOKIE ['t00ls'] = $ md5 )&&! (Isset ($ _ POST ['username']) & isset ($ _ POST ['password']) & (md5 (md5 ($ _ POST ['username']). md5 ($ _ POST ['password']) = $ md5 )))
{
Echo '';
}
Elseif (isset ($ _ POST ['username']) & isset ($ _ POST ['password']) & (md5 (md5 ($ _ POST ['username']). md5 ($ _ POST ['password']) = $ md5 ))
{
Setcookie ("t00ls", $ md5, time () + 60*60*24*365 ,"/");
Echo "login successful! ";
Header ('refresh: 1; url = '. MYFILE .'? Action = scan ');
Exit ();
}
Else
{
Setcookie ("t00ls", $ md5, time () + 60*60*24*365 ,"/");
$ Setting = getSetting ();
$ Action = isset ($ _ GET ['action'])? $ _ GET ['action']: "";

If ($ action = "logout ")
{
Setcookie ("t00ls", "", time ()-3600 );
Header ("Location:". MYFILE );
Exit ();
}
If ($ action = "download" & isset ($ _ GET ['file']) & trim ($ _ GET ['file'])! = "")
{
$ File = $ _ GET ['file'];
Ob_clean ();
If (@ file_exists ($ file )){
Header ("Content-type: application/octet-stream ");
Header ("Content-Disposition: filename =" ". basename ($ file ).""");
Echo file_get_contents ($ file );
}
Exit ();
}
?>

<? Php echo $ _ SERVER ['server _ ADDR ']?> <? Php echo "$ version"?>

<? = Date ("Y-m-d H: I: s", mktime ()?> Scan | Set | Logout

<? Php
If ($ action = "setting ")
{
If (isset ($ _ POST ['btnsetting'])
{
$ Ssetting = array ();
$ Ssetting ['user'] = isset ($ _ POST ['checkuser'])? $ _ POST ['checkuser']: "php | php? | Phtml ";
$ Ssetting ['all'] = isset ($ _ POST ['checkall']) & $ _ POST ['checkall'] = "on "? 1:0;
$ Ssetting ['hta'] = isset ($ _ POST ['checkhta']) & $ _ POST ['checkhta'] = "on "? 1:0;
Setcookie ("t00ls_s", base64_encode (serialize ($ Ssetting), time () + 60*60*24*365 ,"/");
Echo "settings complete! ";
Header ('refresh: 1; url = '. MYFILE .'? Action = setting ');
Exit ();
}
?>

<? Php
}
Else
{
$ Dir = isset ($ _ POST ['path'])? $ _ POST ['path']: MYPATH;
$ Dir = substr ($ dir,-1 )! = "/"? $ Dir. "/": $ dir;
?>

<? Php
If (isset ($ _ POST ['btnscan'])
{
$ Start = mktime ();
$ Is_user = array ();
$ Is_ext = "";
$ List = "";

If (trim ($ setting ['user'])! = "")
{
$ Is_user = explode ("|", $ setting ['user']);
If (count ($ is_user)> 0)
{
Foreach ($ is_user as $ key => $ value)
$ Is_user [$ key] = trim (str_replace ("? "," (.) ", $ Value ));
$ Is_ext = "(.". implode ("($ |.) | (.", $ is_user). "($ | .))";
}
}
If ($ setting ['hta'] = 1)
{
$ Is_hta = 1;
$ Is_ext = strlen ($ is_ext)> 0? $ Is_ext. "|": $ is_ext;
$ Is_ext. = "(^. htaccess $ )";
}
If ($ setting ['all'] = 1 | (strlen ($ is_ext) = 0 & $ setting ['hta'] = 0 ))
{
$ Is_ext = "(. + )";
}

$ Php_code = getCode ();
If (! Is_readable ($ dir ))
$ Dir = MYPATH;
$ Count = $ scanned = 0;
Scan ($ dir, $ is_ext );
$ End = mktime ();
$ Spent = ($ end-$ start );
?>

Scan: <? Php echo $ scanned?> File | found: <? Php echo $ count?> Suspicious file | time consumed: <? Php echo $ spent?> Seconds

<? Php echo $ list?>

No.

File

Update Time

Cause

Features

Action

<? Php
}
}
}
Ob_flush ();
?>


<? Php
Function scan ($ path = '.', $ is_ext ){
Global $ php_code, $ count, $ scanned, $ list;
$ Ignore = array ('.','..');
$ Replace = array ("", "n", "r", "t ");
$ Dh = @ opendir ($ path );

While (false! ==( $ File = readdir ($ dh ))){
If (! In_array ($ file, $ ignore )){
If (is_dir ("$ path $ file ")){
Scan ("$ path $ file/", $ is_ext );
} Else {
$ Current = $ path. $ file;
If (MYFULLPATH = $ current) continue;
If (! Preg_match ("/$ is_ext/I", $ file) continue;
If (is_readable ($ current ))
{
$ Scanned ++;
$ Content = file_get_contents ($ current );
$ Content = str_replace ($ replace, "", $ content );
Foreach ($ php_code as $ key => $ value)
{
If (preg_match ("/$ value/I", $ content ))
{
$ Count ++;
$ J = $ count % 2 + 1;
$ Filetime = date ('Y-m-d H: I: S', filemtime ($ current ));
$ Reason = explode ("->", $ key );
$ Url = str_replace (REALPATH, HOST, $ current );
Preg_match ("/$ value/I", $ content, $ arr );
$ List. ="

$ Count
$ Current
$ Filetime
$ Reason [0]
$ Reason [1]
Download
";
// Echo $ key. "-". $ path. $ file. "(". $ arr [0]. ")"."
";
// Echo $ path. $ file ."
";
Break;
}
}
}
}
}
}
Closedir ($ dh );
}
Function getSetting ()
{
$ Ssetting = array ();
If (isset ($ _ COOKIE ['t00ls _ s'])
{
$ Ssetting = unserialize (base64_decode ($ _ COOKIE ['t00ls _ s']);
$ Ssetting ['user'] = isset ($ Ssetting ['user'])? $ Ssetting ['user']: "php | php? | Phtml | shtml ";
$ Ssetting ['all'] = isset ($ Ssetting ['all'])? Intval ($ Ssetting ['all']): 0;
$ Ssetting ['hta'] = isset ($ Ssetting ['hta'])? Intval ($ Ssetting ['hta']): 1;
}
Else
{
$ Ssetting ['user'] = "php | php? | Phtml | shtml ";
$ Ssetting ['all'] = 0;
$ Ssetting ['hta'] = 1;
Setcookie ("t00ls_s", base64_encode (serialize ($ Ssetting), time () + 60*60*24*365 ,"/");
}
Return $ Ssetting;
}
Function getCode ()
{
Return array (
'Backdoor features-> cha88.cn' => 'cha88. cn ',
'Backdoor features-> c99shell' => 'c99shell ',
'Backdoor features-> phpspy' => 'phpspy ',
'Backdoor features-> scanners' => 'Scanners ',
'Backdoor features-> cmd. php' => 'cmd. php ',
'Backdoor features-> str_rot13 '=> 'Str _ rot13 ',
'Webshell' => 'webshell ',
'Backdoor features-> EgY_SpIdEr '=> 'egy _ SpIdEr ',
'Backdoor features-> tools88.com '=> 'tools88. com ',
'Backdoor features-> secforce' => 'secforce ',
'Backdoor features-> eval ("?> '=> 'Eval (' | ")?> ',
'Suspicious code features-> system ('=> 'system (',
'Suspicious code features-> passthru ('=> 'passthru (',
'Suspicious code features-> shell_exec ('=> 'shell _ exec (',
'Suspicious code features-> exec ('=> 'exec (',
'Suspicious code features-> popen ('=> 'popen (',
'Suspicious code features-> proc_open '=> 'proc _ open ',
'Suspicious code features-> eval ($ '=> 'eval (' | "| s *) \ $ ',
'Suspicious code features-> assert ($ '=> 'assert (' | "| s *) \ $ ',
'Dangerous MYSQL code-> returns string soname' => 'returnsstringsoname ',
'Dangerous MYSQL code-> into outfile' => 'Invalid outfile ',
'Dangerous MYSQL code-> load_file '=> 'Select (s +) (. *) load_file ',
'Encrypted backdoor features-> eval (gzinflate ('=> 'eval (gzinflate (',
'Encrypted backdoor features-> eval (base64_decode ('=> 'eval (base64_decode (',
'Encrypted backdoor features-> eval (gzuncompress ('=> 'eval (gzuncompress (',
'Encrypted backdoor features-> eval (gzdecode ('=> 'eval (gzdecode (',
'Encrypted backdoor features-> eval (str_rot13 ('=> 'eval (str_rot13 (',
'Encrypted backdoor features-> gzuncompress (base64_decode ('=>' gzuncompress (base64_decode (',
'Encrypted backdoor features-> base64_decode (gzuncompress ('=> 'base64 _ decode (gzuncompress (',
'One-sentence backdoor feature-> eval ($ _ '=> 'eval (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'One-sentence backdoor feature-> assert ($ _ '=> 'assert (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Webshell features in one sentence-> require ($ _ '=> 'Require (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Webshell features in one sentence-> require_once ($ _ '=> 'Require _ once (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Backdoor features in one sentence-> include ($ _ '=>' include ('| "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'One-sentence backdoor feature-> include_once ($ _ '=> 'Include _ once (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Backdoor features in one sentence-> call_user_func ("assert" '=> 'Call _ user_func ("|') assert (" | ')',
'Webshell features in one sentence-> call_user_func ($ _ '=> 'Call _ user_func (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Webshell features in one sentence-> $ _ POST/GET/REQUEST/COOKIE [?] ($ _ POST/GET/REQUEST/COOKIE [?] '=>' $ _ (POST | GET | REQUEST | COOKIE) [([^] +)] ('| "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )[',
'Backdoor features in one sentence-> echo (file_get_contents ($ _ POST/GET/REQUEST/COOKIE '=> 'echo (file_get_contents (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Upload backdoor features-> file_put_contents ($ _ POST/GET/REQUEST/COOKIE, $ _ POST/GET/REQUEST/COOKIE '=> 'File _ put_contents (' | "| s *) \ $ _ (POST | GET | REQUEST | COOKIE) [([^] +)], ('| "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )',
'Upload backdoor features-> fputs (fopen ("? "," W "), $ _ POST/GET/REQUEST/COOKIE ['=> 'fputs (fopen ((. +), ('| ") w (' |"), ('| "| s *) \ $ _ (POST | GET | REQUEST | COOKIE )[',
'. Htaccess plug-in feature-> SetHandler application/x-httpd-php' => 'sethandlerapplication/x-httpd-php ',
'. Htaccess plug-in feature-> php_value auto_prepend_file' => 'php _ valueauto_prepend_file ',
'. Htaccess plug-in feature-> php_value auto_append_file' => 'php _ valueauto_append_file'
);
}
?>

I hope this article will help you with php-based website security construction.