228 lines
9.3 KiB
Perl
228 lines
9.3 KiB
Perl
#!/usr/bin/perl
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# Version 0.08 Wed Apr 15 01:55:56 UTC 2015
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# The above line may need to be changed to point at your version of Perl
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#
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# This script attempts to find malicious files/scripts on your machine.
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# It specifically looks for spambots that we're aware of, as well
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# as "suspicious" constructs in various scripting languages.
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#
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# To use it, you should put this in a file on your computer called
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# "findbot.pl" and make it executable by "chmod 755 findbot.pl".
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#
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# By default, findbot.pl scans the directories /tmp, /usr/tmp, /home and
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# /var/www. This script isn't fast. So if you know where to look you can
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# speed things up by giving just the directories that you suspect has the
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# malware.
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#
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# You can often find out what user is infected by using:
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# lsof -i | grep smtp
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# and looking for processes that are NOT your mail server.
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#
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# If you're successful finding the user, you need to look everywhere the user
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# has write permissions - and you can run findbot.pl faster, by something like:
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#
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# findbot.pl /tmp /usr/tmp /home/<user> <user's web directory>
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#
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# There are two types of "detections" - "suspicious files" are files that contain
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# things that -may- be malicious.
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# "malware" is definitely malicious software.
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#
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# This script needs the following command line utilities. It will not run
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# if it can't find them, you will have to install them yourself:
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# - "md5sum" (Linux) or "md5" (FreeBSD etc) this appears to be standard
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# core utilities.
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# - "strings" - on Linux this is in the "binutils" package
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# - "file" - on Linux this is in the "file" package.
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#
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# Usage:
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# findbot.pl [-c] [directories...]
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#
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# If a list of directories is supplied, it's used, otherwise,
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# /tmp, /usr/tmp, /home and /var/www are use by default.
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#
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# The -c option is a shortcut to make finding cryptophp faster and
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# easier, but this may not work in all situations
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#
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# Very simple web malware detection module.
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# .01 -> .02:
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# - more strings of bad software
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# - search for encoded perl scripts
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# .02 -> .03: 2013/01/10 Ray
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# - speed up
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# - MD5 stuff
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# .03 -> .04: 2013/01/13 Ray
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# - improved docs
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# .04 -> .05: 2013/01/20 Ray
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# - more patterns
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# - MAXLINES way too small
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# .05 -> .06: 2014/10/31 Havriliuc Andrei, Hostvision srl, Romania
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# - many more patterns/heuristics from hoster's experience
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# - Thanks for the contribution!
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# .06 -> 07: 2014/11/22 Ray
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# - Speed up specifically for current version of cryptophp
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# .07 -> 08: 2015/04/14 Ray
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# - Stealrat patterns
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my $access = '(\.htaccess)';
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my $accesspat = '(RewriteRule)';
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## Extensions scanned
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my $scripts = '\.(php|pl|cgi|bak|sh|txt|jpeg|jpg|png|gif|bmp|css)$';
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## Patterns
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my $scriptpat = '(die\(PHP_OS.chr\(49\).chr\(48\).chr\(43\).md5\(0987654321\)|die\(PHP_OS.chr\(49\).chr\(49\).chr\(43\).md5\(0987654321\)|social\.png|web shell|edoced_46esab|PHPShell|EHLO|MAIL FROM|RCPT TO|\$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\'\.\(32\*2\))';
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my @defaultdirs = ('./');
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my $MAXLINES = 40000;
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my($strings, $md5sum, $file, %badhash);
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&inithelpers;
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&badhashes;
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#my $executable = '^(sshd|cache|exim|sh|bash)$';
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if ($ARGV[0] =~ /^-c/) {
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$patterns = '(social\.png)';
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$scripts = '\.(php)$';
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shift(@ARGV);
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}
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if ($ARGV[0] =~ /^-/) {
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my $l = join(',', @defaultdirs);
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print STDERR <<EOF;
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usage: $0 [-c] [directories to scan...]
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If no directories specified, script uses:
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$l
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If -c specified, searches just for one set of cryptphp
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markers. May miss newer versions
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EOF
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exit 0;
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}
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if (!scalar(@ARGV)) {
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push(@ARGV, @defaultdirs);
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}
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for my $dir (@ARGV) {
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&recursion($dir);
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}
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sub recursion {
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my ($dir) = @_;
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my (@list);
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if (!opendir(I, "$dir")) {
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return if $! =~ /no such file/i;
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print STDERR "$dir: Can't open: $!, skipping\n";
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return;
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}
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@list = readdir(I);
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closedir(I);
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for my $mfile (@list) {
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next if $mfile =~ /^\.\.?$/; # skip . and ..
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my $cf = $currentfile = "$dir/$mfile";
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$cf =~ s/'/'"'"'/g; # hide single-quotes in filename
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$cf = "'$cf'"; # bury in single-quotes
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if (-d $currentfile && ! -l $currentfile) {
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&recursion($currentfile); # don't scan symlinks
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next;
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}
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next if ! -f $currentfile;
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if ($mfile =~ /$scripts/) {
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&scanfile($currentfile, $scriptpat);
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} elsif ($mfile =~ /$access/) {
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&scanfile($currentfile, $accesspat);
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}
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# up to here it's fast.
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next if -s $currentfile > 1000000 || -s $currentfile < 2000;
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#print STDERR "$currentfile\n";
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my $type = `$file $cf`;
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if ($type =~ /(ELF|\d\d-bit).*executable/ || $currentfile =~ /\.(exe|scr|com)$/) {
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#print STDERR "cf: $cf\n";
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my $checksum = `$md5sum $cf`;
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chomp($checksum);
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$checksum =~ s/\s.*//;
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if ($badhash{$checksum}) {
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print STDERR "$currentfile: Malware detected!\n";
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next;
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}
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my $strings = `$strings $cf`;
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if ($strings =~ /\/usr\/bin\/perl/sm) {
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print STDERR "$currentfile: possible binary-encoded-perl\n";
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next;
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}
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}
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}
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}
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sub scanfile {
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my ($currentfile, $patterns) = @_;
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#print $currentfile, "\n";
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open(I, "<$currentfile") || next;
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my $linecount = 1;
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while(<I>) {
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chomp;
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if ($_ =~ /$patterns/) {
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my $pat = $1;
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my $string = $_;
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## Wasn't printing the result correctly, so we gave up on this code.
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# if ($string =~ /^(.*)$pat(.*)$/) {
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# $string = substr($1, length($1)-10, 10) .
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# $pat .
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# substr($2, 0, 10);
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# }
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#$string =~ s/^.*(.{,10}$pat.{,10}).*$/... $1 .../;
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print "$currentfile: Suspicious($pat):\n $string\n\n";
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last;
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}
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last if $linecount++ > $MAXLINES;
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}
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close(I);
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}
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sub inithelpers {
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if (-x '/usr/bin/md5sum') {
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$md5sum = '/usr/bin/md5sum';
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} elsif (-x '/sbin/md5') {
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$md5sum = '/sbin/md5 -q';
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}
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for my $x (('/bin', '/usr/bin')) {
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if (-x "$x/strings") {
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$strings = "$x/strings";
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}
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if (-x "$x/file") {
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$file = "$x/file";
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}
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}
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die "Can't find 'md5' checksumming tool - normally in Linux coretools package" if !$md5sum;
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die "Can't find 'strings' tool - normally in Linux bintools package" if !$strings;
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die "Can't find 'file' tool - normally in Linux 'file' package" if !$file;
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}
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sub badhashes {
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map { $badhash{$_} = 1; } ((
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'f7536bb412d6c4573fd6fd819e1b07bb',
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'0fdb34f48166dae57ff410d723efd3f7',
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'396d1fb94d79b732f6ab2fa6c5f3ed39',
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'fd3c01133946d59ace4fdb49dde93268', #Directmailer .exe Windows binary
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));
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}
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