Find bot Perl script

Das Problem von E-Mail bots am Webserver kennt fast jeder. Durch veraltetete CMS-Installationen wie Typo3, WordPress, Joomla oder Magento gelangen gerne mal schädliche Skripte auf den Server die benutzt werden um Spam-Mails zu senden. Besonders Hoster von Webservern müssen diese Gefahren schnell und zuverlässig erkennen, damit die Server-IP-Adresse nicht geblacklisted wird. Dieses Perl-Skript hilft bei der Suche nach Malware.

findbot.pl Skript

<pre>#!/usr/bin/perl

#  Copyright (c) 2012-2016, The Spamhaus Project
#                All rights reserved.
#  
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#  
#  1. Redistributions of source code must retain the above copyright notice, this
#     list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#  
#     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
#     ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
#     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
#     ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
#     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
#     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
#     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
#     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Version 0.09 Sat Aug  1 02:42:13 UTC 2015

# The above line may need to be changed to point at your version of Perl
#
#	This script attempts to find malicious files/scripts on your machine.
#	It specifically looks for spambots that we're aware of, as well
#	as "suspicious" constructs in various scripting languages.
#
#	To use it, you should put this in a file on your computer called
#	"findbot.pl" and make it executable by "chmod 755 findbot.pl".
#
#	By default, findbot.pl scans the directories /tmp, /usr/tmp, /home and
#	/var/www.  This script isn't fast.  So if you know where to look you can
#	speed things up by giving just the directories that you suspect has the
#	malware.
#
#	You can often find out what user is infected by using:
#		lsof -i | grep smtp
#	and looking for processes that are NOT your mail server.
#
#	If you're successful finding the user, you need to look everywhere the user
#	has write permissions - and you can run findbot.pl faster, by something like:
#
#	findbot.pl /tmp /usr/tmp /home/<user> <user's web directory>
#
#	There are two types of "detections" - "suspicious files" are files that contain
#	things that -may- be malicious.
#	"malware" is definitely malicious software.
#
#	This script needs the following command line utilities.  It will not run
#	if it can't find them, you will have to install them yourself:
#		- "md5sum" (Linux) or "md5" (FreeBSD etc) this appears to be standard
#			core utilities.
#		- "strings" - on Linux this is in the "binutils" package
#		- "file" - on Linux this is in the "file" package.
#
# Usage:
#	findbot.pl [-c] [directories...]
#
#	If a list of directories is supplied, it's used, otherwise,
#	/tmp, /usr/tmp, /home and /var/www are use by default.
#
#	The -c option is a shortcut to make finding cryptophp faster and
#	easier, but this may not work in all situations
#
# Very simple web malware detection module.
# .01 -> .02:
#	- more strings of bad software
#	- search for encoded perl scripts
# .02 -> .03: 2013/01/10 Ray
#	- speed up
#	- MD5 stuff
# .03 -> .04: 2013/01/13 Ray
#	- improved docs
# .04 -> .05: 2013/01/20 Ray
#	- more patterns
#	- MAXLINES way too small
# .05 -> .06: 2014/10/31 Havriliuc Andrei, Hostvision srl, Romania
#	- many more patterns/heuristics from hoster's experience
#	- Thanks for the contribution!
# .06 -> 07: 2014/11/22 Ray
#	- Speed up specifically for current version of cryptophp
# .07 -> 08: 2015/04/14 Ray
#	- Stealrat patterns
# .07 -> 08: 2015/07/31 Ray
#	- User contributed pattern for new PHP script

my $access = '(\.htaccess)';
my $accesspat = '(RewriteRule)';

## Extensions scanned

my $scripts = '\.(php|pl|cgi|bak|sh|txt|jpeg|jpg|png|gif|bmp|css)$';

## Patterns
my $scriptpat = '(Edited By GuN-Jack|die\(PHP_OS.chr\(49\).chr\(48\).chr\(43\).md5\(0987654321\)|die\(PHP_OS.chr\(49\).chr\(49\).chr\(43\).md5\(0987654321\)|social\.png|r57|c99|web shell|passthru|shell_exec|base64_decode|edoced_46esab|PHPShell|EHLO|MAIL FROM|RCPT TO|fsockopen|\$random_num\.qmail|getmxrr|\$_POST\[\'emaillist\'\]|if\(isset\(\$_POST\[\'action\'\]|BAMZ|shell_style|malsite|cgishell|Defaced|defaced|Defacer|defacer|hackmode|ini_restore|ini_get\("open_basedir"\)|runkit_function|rename_function|override_function|mail.add_x_header|\@ini_get\(\'disable_functions\'\)|open_basedir|openbasedir|\@ini_get\("safe_mode"|JIKO|fpassthru|passthru|hacker|Hacker|gmail.ru|fsockopen\(\$mx|\'mxs\.mail\.ru\'|yandex.ru|UYAP-CASTOL|KEROX|BIANG|FucKFilterCheckUnicodeEncoding|FucKFilterCheckURLEncoding|FucKFilterScanPOST|FucKFilterEngine|fake mailer|Fake mailer|Mass Mailer|MasS Mailer|ALMO5EAM|3QRAB|Own3d|eval\(\@\$_GET|TrYaG|Turbo Force|eval \( gzinflate|eval \(gzinflate|cgi shell|cgitelnet|\$_FILES\[file\]|\@copy\(\$_FILES|root\@|eval\(\(base64_decode|define\(\'SA_ROOT\'|cxjcxj|PCT4BA6ODSE|if\(isset\(\$s22\)|yb dekcah|dekcah|\@md5\(\$_POST|iskorpitx|\$__C|back connect|ccteam.ru|"passthru"|"shell_exec"|CHMOD_SHELL|EXIT_KERNEL_TO_NULL|original exploit|prepare_the_exploit|RUN_ROOTSHELL|ROOTSHELL|\@popen\(\$sendmail|\'HELO localhost\'|TELNET|Telnet|BACK-CONNECT|BACKDOOR|BACK-CONNECT BACKDOOR|AnonGhost|CGI-Telnet|webr00t|Ruby Back Connect|Connect Shell|require \'socket\'|HACKED|\@posix_getgrgid\(\@filegroup|\@posix_getpwuid\(\@fileowner|\&\#222\;\&\#199\;\&\#198\;\&\#227\;\&\#229\;|open_basedir|disable_functions|brasrer64r_rdrecordre|hacked|Hacked|\$sF\[4\]\.\$sF\[5\]\.\$sF\[9\]\.\$sF\[10\]\.|\$sF\="PCT4BA6ODSE_"|\$s21\=strtolower|6ODSE_"\;|Windows-1251|\@eval\(\$_POST\[|h4cker|Kur-SaD|\'Fil\'\.\'esM\'\.\'an\'|echo PHP_OS\.|\$testa != ""|\@PHP_OS|\$_POST\[\'veio\'\]|file_put_contents\(\'1\.txt\'|\$GLOBALS\["\%x61|\\\40\\\x65\\\166\\\x61\\\154\\\x28\\\163\\\x74\\\162\\\x5f\\\162\\\x65\\\160\\\x6c\\\141\\\x63\\\145|md5decrypter\.com|rednoize\.com|hashcracking\.info|milw0rm\.com|hashcrack\.com|function_exists\(\'shell_exec\'\)|Sh3ll Upl04d3r|Sh3ll Uploader|S F N S A W|\$\{\$\{"GLOBALS"\}|\$i59\="Euc\<v\#|\$contenttype \= \$_POST\[|eval\(base64|killall|1\.sh|\/usr\/bin\/uname -a|FilesMan|unserialize\(base64_decode|eval \( base64|eval \(base64|eval\(unescape|eval\(@gzinflate|gzinflate\(base64|str_rot13\(\@base64|str_rot13\(base64|gzinflate\(\@str_rot13|\/\.\*\/e|gzuncompress\(base64|substr\(\$c, \$a, \$b|\\\x47LOB|\\\x47LO\\\x42|\\\x47L\\\x4f\\\x42|\\\x47\\\x4c\\\x4f\\\x42|eval\("\?\>"\.base64_decode|\|imsU\||\!msiU|host\=base64|exif \= exif_|"\?Q\?|decrypt\(base64|Shell by|die\(PHP_OS|shell_exec\(base64_decode|\$_F\=|edoced_46esab|\$_D\=strrev|\]\)\)\;\}\}eval|\\\x65\\\x76\\\x61\\\x6c\\\x28|"e"\."va"\."l|\$so64 \=|sqlr00t|qx\{pwd\}|OOO0000O0|OOO000O00|OOO000000|\/\\\r\\\n\\\r\\\n|\$baseurl \= base64_decode|\$remoteurl\,\'wp-login\.php\'|\'http\:\/\/\'\.\$_SERVER\[\'SERVER_NAME\'\]|kkmvbziu|\$opt\("\/292\/e"|\$file\=\@\$_COOKIE\[\'|phpinfo\(\)\;die|return base64_decode\(|\@imap_open\(|\@imap_list\(|\$Q0QQQ\=0|\$GLOBALS\[\'I111\'\]|base64_decode\(\$GLOBALS|eval\(x\(|\@array\(\(string\)stripslashes|function rx\(\)| IRC |BOT IRC|\$bot_password|this bot|Web Shell|Web shell|getenv\(\'SERVER_SOFTWARE\'\)|file_exists\(\'\/tmp\/mb_send_mail\'\)|unlink\(\'\/tmp\/|imap_open\(\'\/etc\/|ini_set\(\'allow_url|\'_de\'\.\'code\'|\'base\'\.\(32\*2\))';

my @defaultdirs = ('/tmp', '/usr/tmp', '/home', '/var/www');

my $MAXLINES = 40000;

my($strings, $md5sum, $file, %badhash);

&inithelpers;
&badhashes;

#my $executable = '^(sshd|cache|exim|sh|bash)$';

if ($ARGV[0] =~ /^-c/) {
    $patterns = '(social\.png)';
    $scripts = '\.(php)$';
    shift(@ARGV);
}

if ($ARGV[0] =~ /^-/) {
    my $l = join(',', @defaultdirs);
    print STDERR <<EOF;
usage: $0 [-c] [directories to scan...]

    If no directories specified, script uses:
$l
    If -c specified, searches just for one set of cryptphp
    markers.  May miss newer versions

EOF
    exit 0;
}

  

if (!scalar(@ARGV)) {
    push(@ARGV, @defaultdirs);
}

for my $dir (@ARGV) {
    &recursion($dir);
}

sub recursion {
    my ($dir) = @_;
    my (@list);
    if (!opendir(I, "$dir")) {
	return if $! =~ /no such file/i;
	print STDERR "$dir: Can't open: $!, skipping\n";
	return;
    }
    @list = readdir(I);
    closedir(I);
    for my $mfile (@list) {
	next if $mfile =~ /^\.\.?$/;	# skip . and ..
	my $cf = $currentfile = "$dir/$mfile";

	$cf =~ s/'/'"'"'/g;	# hide single-quotes in filename
	$cf = "'$cf'";		# bury in single-quotes

	if (-d $currentfile && ! -l $currentfile) {
	    &recursion($currentfile);	# don't scan symlinks
	    next;
	} 
	next if ! -f $currentfile;
	if ($mfile =~ /$scripts/) {
	    &scanfile($currentfile, $scriptpat);
	} elsif ($mfile =~ /$access/) {
	    &scanfile($currentfile, $accesspat);
	}

	# up to here it's fast.

	next if -s $currentfile > 1000000 || -s $currentfile < 2000;

#print STDERR "$currentfile\n";

	my $type = `$file $cf`;

	if ($type =~ /(ELF|\d\d-bit).*executable/ || $currentfile =~ /\.(exe|scr|com)$/) {
#print STDERR "cf: $cf\n";
	    my $checksum = `$md5sum $cf`;
	    chomp($checksum);
	    $checksum =~ s/\s.*//;
	    if ($badhash{$checksum}) {
		print STDERR "$currentfile: Malware detected!\n";
		next;
	    }

	    my $strings = `$strings $cf`;
	    if ($strings =~ /\/usr\/bin\/perl/sm) {
		print STDERR "$currentfile: possible binary-encoded-perl\n";
		next;
	    }
	}
    }
}

sub scanfile {
    my ($currentfile, $patterns) = @_;
#print $currentfile, "\n";
    open(I, "<$currentfile") || next;
    my $linecount = 1;
    while(<I>) {
	chomp;
	if ($_ =~ /$patterns/) {
	    my $pat = $1;
	    my $string = $_;


## Wasn't printing the result correctly, so we gave up on this code.
#	    if ($string =~ /^(.*)$pat(.*)$/) {
#		$string = substr($1, length($1)-10, 10) .
#				      $pat .
#				      substr($2, 0, 10);
#	    }
	    #$string =~ s/^.*(.{,10}$pat.{,10}).*$/... $1 .../;
	    print "$currentfile: Suspicious($pat):\n $string\n\n";
	    last;
	}
	last if $linecount++ > $MAXLINES;
    }
    close(I);
}

sub inithelpers {
    if (-x '/usr/bin/md5sum') {
	$md5sum = '/usr/bin/md5sum';
    } elsif (-x '/sbin/md5') {
	$md5sum = '/sbin/md5 -q';
    }
    for my $x (('/bin', '/usr/bin')) {
	if (-x "$x/strings") {
	    $strings = "$x/strings";
	}
	if (-x "$x/file") {
	    $file = "$x/file";
	}
    }
    die "Can't find 'md5' checksumming tool - normally in Linux coretools package" if !$md5sum;
    die "Can't find 'strings' tool - normally in Linux bintools package" if !$strings;
    die "Can't find 'file' tool - normally in Linux 'file' package" if !$file;
}

sub badhashes {
    map { $badhash{$_} = 1; } ((
    	'f7536bb412d6c4573fd6fd819e1b07bb',
	'0fdb34f48166dae57ff410d723efd3f7',
	'396d1fb94d79b732f6ab2fa6c5f3ed39',
	'fd3c01133946d59ace4fdb49dde93268', #Directmailer .exe Windows binary
	));
}
</pre>

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Über den Autor Andreas Grundner

Ich bin Wordpress, Joomla, Typo3 Integrator, Unix Rootserver Administrator und Webanwendungsprogrammierer. Mittlerweile habe ich über 70 Webprojekte weitgehend selbstständig mit enger Kundenabsprache realisiert. Ich bin auf One Page Websites auf Wordpress-Basis spezialisiert, biete aber auch Suchmaschinenoptimierung (SEO), Blogs, Facebook, Youtube und Google+ Seiten an. Meine Verpflichtung gilt dem Datenschutz, meine Leidenschaft dem Finden und Aufzeigen von Sicherheitslücken in Webanwendungen.

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