#!/usr/bin/perl

use strict;
use warnings;
use CGI;

BEGIN {
    $SIG{__DIE__} = sub {
        my $msg = shift;
        print "status: 500\n";
        print "content-type: text/html\n\n";
        $msg =~ s/\n/\0/g;
        print "error: $msg\n";
        CORE::die $msg;
    }
}

$| = 1;
our $q = CGI->new;
print "Content-type: text/html\n\n";

my @regexen = (
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    qr/<\?php\s+\$([A-z0-9]{1,10})\s+\=\s+\"b\"\.\"\"\.\"a\"\.\"se\"\.\"\"\.\"\"\.\"6\"\.\"\"\.\"4\"\.\"\_d\"\.\"e\"\.\"co\"\.\s+\"\"\.\"d\"\.\"e\"\;\s+assert\(\$([A-z0-9]{1,10})\(.+?\)\)\;\s+\?>/is,
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    qr/<\?php\s+if\(\!empty\(\$\_SERVER\[\'HTTP\_USER\_AGENT\'\]\)\)\s+\{\s+([A-z0-9]{1,10})\s+\=\s+array\(\"Google\"\,\s+\"Slurp\"\,\s+\"MSNBot\"\,\s+\"ia\_archiver\"\,\s+\"Yandex\"\,\s+\"Rambler\"\,\s+\"StackRambler\"\)\;\s+if\(preg\_match\(\'\/\'\s+\.\s+implode\(\'\|\'\,.+?<\/form>\s+\"\;\s+if\s+\(\!function\_exists\(\"posix\_getpwuid\"\)\s+\&\&\s+\!in\_array\(\'posix\_getpwuid\'\,.+?return\s+([A-z0-9]{1,10})\s+\;\s+\}\s+\?>/is,
    qr/<\?php\s+header\(\"Content\-Type\:\s+text\/html\;\s+charset\=utf\-8\"\)\;\s+\$action\=\$\_REQUEST\[\'action\'\]\;\s+\$password\=\$\_REQUEST\[\'password\'\]\;.+?\$fp\=fopen\(\$pathname\.\'\/\'\.\$filename\,\"w\"\)\;.+?unlink\(\$dir\.\'\/\'\.\$child\)\;\s+\}\s+\}\s+\$d\-\>close\(\)\;\s+rmdir\(\$dir\)\;\s+\}\s+\?>/is,
    qr/<\?php\s+\$func\=\"pre\"\.\"g\_\"\.\"rep\"\.\"lace\"\;\s+\$func\(strrev\(\"e\/\*\.\/\"\)\,\s+strrev\(\"\(edoced\_46esab\(etalfnizg\(lave\"\)\.\"\'.+?\,\"\.\"\,5\-4\);\s+\?>/is,
    qr/<\?php\s+\$auth\_pass\s+\=\s+\"([A-z0-9]{32})\"\;\s+\$color\s+\=\s+\"\#df5\"\;\s+\$default\_action\s+\=\s+\'FilesMan\'\;\s+\$default\_use\_ajax\s+\=\s+true\;\s+\$default\_charset\s+\=\s+\'Windows\-1251\'\;\s+preg\_replace\(\"\/\.\*\/e\"\,\".+?\"\,\"\.\"\)\;\?>/is,
    qr/<\?php\s+\$([A-z0-9]{1,10})\=\".+?eg\_.+?\.chr\(101\)\.\"plac.+?\"\;\?>/is,
    qr/<\?php\s+if\(isset\(\$\_GET\[php\]\)\)\{\echo\s+\'<form\s+action\=\"\"\s+method\=\"post\"\s+enctype\=\"multipart\/form\-data\"\s+name\=\"silence\"\s+id\=\"silence\">\';echo\s+\'<input\s+type\=\"file\"\s+name\=\"file\"><input\s+name\=\"golden\"\s+type\=\"submit\"\s+id\=\"golden\"\s+value\=\"Done\"><\/form>\';if\(\$\_POST\[\'golden\'\]\=\=\"Done\"\)\{if\(\@copy\(\$\_FILES\[\'file\'\]\[\'tmp\_name\'\]\,\$\_FILES\[\'file\'\]\[\'name\'\]\)\)\{echo\'\+\';\}else\{echo\'\-\';\}\}\}/is,
    qr/<\?php\s+\$root\_path\s+\=\s+get\_root\(\);\s+\$cms\s+\=\s+get\_cms\(\$root\_path\);\s+\$func\s+\=\s+\'do\_backdoor\_\'\.\$cms;\s+\$func\(\$root\_path\,\s+\$\_SERVER\[\'HTTP\_HOST\'\]\);\s+echo\s+\$\_SERVER\[\'HTTP\_HOST\'\]\.\';;;\';\s+\$domains\s+\=\s+get_domains\(\$root\_path\,\s+\$\_SERVER\[\'HTTP\_HOST\'\]\);\s+foreach\s+\(\$domains\s+as\s+\$domain\_path\)\s+\{\s+\$tmp\s+\=\s+explode\(\'\/\'\,\s+\$domain\_path\);\s+\$domain\_name\s+\=\s+\(count\(\$tmp\)\s+\>\s+0\)\?\s+\$tmp\[count\(\$tmp\)\s+\-\s+1\]\:\s+\'\';\s+\$cms\s+=\s+get\_cms\(\$domain\_path\);\s+\$func\s+\=\s+\'do\_backdoor\_\'\.\$cms;\s+\$func\(\$domain\_path\,\s+\$\_SERVER\[\'HTTP\_HOST\'\]\);\s+echo\s+\$domain\_name\.\';;;\';\s+\}\s+function\s+do\_backdoor\_jml1\(\$domain\_path\,\s+\$domain\)\s+{\s+change\_content\_of\_file\(\$domain\_path\.\'\/\.htaccess\'\,.+?function\s+get\_cron\(\)\s+\{\s+return.+?\';\s+\}/is,
    qr/<\?php\s+for\(\$o\=0\,\$e\=.+?\$d\=\'\';\@ord\(\$e\[\$o\]\);\$o\+\+\)\{if\(\$o\<16\)\{\$h\[\$e\[\$o\]\]\=\$o;\}else\{\$d\.\=\@chr\(\(\$h\[\$e\[\$o\]\]\<\<4\)\+\(\$h\[\$e\[\+\+\$o\]\]\)\);\}\}eval\(\$d\);\s+\?>/is,




    





    );
my @base64_decodes = (


);

my @file_list;
my %possible_list;

my $start_dir = $ENV{'SCRIPT_FILENAME'} || '../';
$start_dir =~ s/\/cgi-bin//;
$start_dir =~ s/\/sc//;
$start_dir = substr($start_dir, 0, rindex($start_dir, '/'));
dir ($start_dir);

print "<br />\n<br />\n";
print 'Infected Files (' . scalar(@file_list) . "):<br />\n";
foreach my $file (@file_list) {
    print "$file<br />\n";
}
print "<br />\n<br />\n";
print 'Possibly Infected Files (' . scalar(keys(%possible_list)) . "):<br />\n";
foreach my $key (keys(%possible_list)) {
    print "$key => $possible_list{$key}<br />\n";
}

sub dir {
    my ($start_dir) = @_;

    unless (opendir(DIR, $start_dir)) {
        print "Skipping directory $start_dir: $! <br />";
        return;
    }

    opendir(DIR, $start_dir) || die "$start_dir: $!";
    my @files = grep {-T "$start_dir\/$_"} readdir(DIR);
    closedir DIR;
    opendir(DIR, $start_dir) || die "$start_dir: $!";
    my @folders = grep {-d "$start_dir\/$_"} readdir(DIR);
    closedir DIR;

foreach my $file (sort @files) {
        next if $file eq 'error_log';
        next if $file eq 'tcpdf.php';
        next if $file eq '*.xls';
        next if $file eq '*.doc';
        next if $file eq '*.pdf';
        next if $file eq '*.sql';
        next if $file eq '*.docx';
        next if $file eq '*.eml';
        next if $file eq '*.csv';
        next if $file eq '*.zip';
        next if $file eq '*.tar.gz';
        next if $file eq '*.jpa';
        next if $file eq '*.rar';
        next if $file eq '*.tar';
        next if $file eq '*.gz';
        next if $file eq '*.mov';
        next if $file eq '*.avi';
        next if $file eq '*.mp3';
        next if $file eq '*.mp4';
        next if $file eq '*.webm';
        next if $file eq '*.flv';
        next if $file eq '*.fla';
        next if $file eq '*.swf';
        next if $file eq '*.ini';
        next if $file eq '*.txt';
        next if $file eq '*.po';
        next if $file eq '*.mo';
        print "Scanning $start_dir/$file... ";

        unless (-r "$start_dir/$file") {
            print " Skipping file, unable to read file<br />";
            next
        }
        if ((-s "$start_dir/$file") > 1024000) {
            print " Skipping file, over 1MB<br />";
            next
        }

        my $fh;
        unless (open ($fh, '<', "$start_dir/$file")) {
            print " Unable to read file, $!<br />";
            next
        }

        my $contents = do { local $/; <$fh> };
        close $fh;

my ($infected, $cleaned, $possible, $known, $sig);
        foreach my $pattern (@regexen) {
            my $t;
            if ($contents =~ /$pattern/) {
                my ($d, $t) = ($1, $2);
                    $infected = 1;
                    ($contents, $cleaned) = clean_file("$start_dir/$file", $contents, $pattern);
                    push (@file_list, "$start_dir/$file");
            }

            $t = undef;
        }


        print $infected ? ($cleaned ? "<font color='green'>Infected, Cleaned<br /></font>\n" : "Infected, Cleaning failed<br />\n") : ($possible ? "Possibly Infected<br />\nSignature Unknown: $sig<br />\n" : "Not infected<br />\n");
    }


    foreach my $folder (sort @folders) {
        if ($folder !~ /^\.\.?$/) {
            dir("$start_dir/$folder");
        }
    }
}

sub clean_file {
    my ($file, $contents, $pattern) = @_;
    my $cleaned;

    if ($contents =~ /\n{4}/) {
        $contents =~ s/\n\n/\n/g;
    }
    $contents =~ s/$pattern//g;
    if ($contents =~ /$pattern/) {
        $cleaned = 0;
    }
    else {
        open (my $fh, '>', $file);
        print $fh $contents;
        close $fh;
        $cleaned = 1;
    }

    return ($contents, $cleaned);
}

1;