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/*
Detect:
- phpencode.org
- http://www.pipsomania.com/best_php_obfuscator.do
- http://atomiku.com/online-php-code-obfuscator/
- http://www.webtoolsvn.com/en-decode/
- http://obfuscator.uk/example/
- http://w3webtools.com/encode-php-online/
- http://www.joeswebtools.com/security/php-obfuscator/
- https://github.com/epinna/weevely3
- http://cipherdesign.co.uk/service/php-obfuscator
- http://sysadmin.cyklodev.com/online-php-obfuscator/
- http://mohssen.org/SpinObf.php
- https://code.google.com/p/carbylamine/
*/
private rule IsPhp
{
strings:
$php = "<?"
$xml = "<?xml"
condition:
$php and not $xml
}
private rule IRC
{
strings:
$a = "USER" fullword
$b = "PASS" fullword
$c = "PRIVMSG" fullword
$d = "MODE" fullword
$e = "PING" fullword
$f = "PONG" fullword
$g = "JOIN" fullword
$h = "PART" fullword
condition:
5 of them
}
private rule CloudFlareBypass
{
strings:
$chk_jschl = "chk_jschl"
$jschl_vc = "jschl_vc"
$jschl_answer = "jschl_answer"
condition:
2 of them // Better be safe than sorry
}
rule ObfuscatedPhp
{
strings:
$vars = /\$__+/ // $__ is rarely used in legitimate scripts
$eval = /[;}][\t ]*@?(eval|preg_replace|system|exec)\(/ // ;eval( <- this is dodgy
$align = /(\$\w+=[^;]*)*;\$\w+=@?\$\w+\(/ //b374k
$oneliner = /<\?php\s*\n*\r*\s*(eval|preg_replace|system|exec)\(/
$weevely3 = /\$\w=\$[a-zA-Z]\('',\$\w\);\$\w\(\);/ // weevely3 launcher
$launcher = /;\$\w+\(\$\w+(,\s?\$\w+)+\);/ // http://bartblaze.blogspot.fr/2015/03/c99shell-not-dead.html
$danone = /\$s20=strtoupper\((\$[0-9A-Za-z]{1,4}\[\d+\]\.){2,9}[^\)]*\);if/
$strange_arg = /\${\$[0-9a-zA-z]+}/
condition:
IsPhp and ($align or $oneliner or $eval or $launcher or $strange_arg or #vars > 5 or $weevely3 or $danone)
}
private rule base64
{
strings:
$eval = "ZXZhbCg"
$system = "c3lzdGVt"
$preg_replace = "cHJlZ19yZXBsYWNl"
$exec = "ZXhlYyg"
condition:
any of them
}
private rule hex
{
strings:
$eval = "\\x65\\x76\\x61\\x6C\\x28" nocase
$exec = "\\x65\\x78\\x65\\x63" nocase
$system = "\\x73\\x79\\x73\\x74\\x65\\x6d" nocase
$preg_replace = "\\x70\\x72\\x65\\x67\\x5f\\x72\\x65\\x70\\x6c\\x61\\x63\\x65" nocase
condition:
any of them
}
rule SuspiciousEncoding
{
condition:
IsPhp and (base64 or hex)
}
rule DodgyPhp
{
strings:
$execution = /(eval|passthru|exec|system|win_shell_execute)\((base64_decode|php:\/\/input|str_rot13|gz(inflate|uncompress)|getenv|\\?\$_(GET|REQUEST|POST))/
$double_encoding = /(base64_decode\s*\(\s*){2}/
$basedir_bypass = /(curl_init\([\"']file:[\"']|file:file:\/\/)/
$safemode_bypass = /\x00\/\.\.\/|LD_PRELOAD/
$shellshock = /putenv\(["']PHP_[^=]=\(\) { [^}] };/
$restore_bypass = /ini_restore\(['"](safe_mode|open_basedir)['"]\)/
$various = "<!--#exec cmd=" //http://www.w3.org/Jigsaw/Doc/User/SSI.html#exec
$pr = /preg_replace\s*\(['"]\/[^\/]*\/e['"]/ // http://php.net/manual/en/function.preg-replace.php
$include = /include\([^\.]+\.(png|jpg|gif|bmp)/ // Clever includes
$htaccess = "SetHandler application/x-httpd-php"
$udp_dos = /sockopen\s*\(['"]udp:\/\//
condition:
IsPhp and (any of them or CloudFlareBypass)
}
rule DangerousPhp
{
strings:
$system = "system" fullword // localroot bruteforcers have a lot of this
$a = "exec" fullword
$b = "eval" fullword
$c = "shell_exec" fullword
$v = "passthru" fullword
$e = "posix_getuid" fullword
$f = "posix_geteuid" fullword
$g = "posix_getgid" fullword
$h = "phpinfo" fullword
$i = "backticks" fullword
$j = "proc_open" fullword
$k = "win_shell_execute" fullword
$l = "win32_create_service" fullword
$m = "posix_getpwuid" fullword
$n = "shm_open" fullword
$o = "assert" fullword
$p = "fsockopen" fullword
$q = "function_exists" fullword
$r = "getmygid" fullword
$s = "php_uname" fullword
$t = "socket_create(AF_INET, SOCK_STREAM, SOL_TCP)"
$u = "fpassthru" fullword
$v = "posix_setuid" fullword
$w = "xmlrpc_decode" fullword
$x = "show_source" fullword
$y = "pcntl_exec" fullword
$whitelist = /escapeshellcmd|escapeshellarg/
condition:
IsPhp and not $whitelist and (5 of them or #system > 250)
}
rule DodgyStrings
{
strings:
$a = "/etc/passwd"
$b = "/etc/shadow"
$c = "/etc/resolv.conf"
$d = "/etc/syslog.conf"
$e = "/etc/proftpd.conf"
$e = "WinExec"
$f = "uname -a" fullword
$g = "nc -l" fullword
$h = "ls -la" fullword
$i = "cmd.exe" fullword nocase
$j = "ipconfig" fullword nocase
$k = "find . -type f" fullword
$l = "defaced" fullword nocase
$m = "slowloris" fullword nocase
$o = "id_rsa" fullword
$p = "backdoor" fullword nocase
$q = "webshell" fullword nocase
$r = "exploit" fullword nocase
$s = "hacking" fullword nocase
$t = "/proc/cpuinfo" fullword
$u = "/bin/sh" fullword
$v = "/bin/bash" fullword
$w = "ps -aux" fullword
$x = "b374k" fullword
$y = /(reverse|web)\s*shell/ nocase
$vbs = /language\s*=\s*vbscript/ nocase
$asp = "scripting.filesystemobject" nocase
condition:
IsPhp and (IRC or 2 of them)
}
rule Websites
{
strings:
$milw0rm = "milw0rm.com"
$exploitsdb = "exploit-db.com"
$injector = "1337day.com"
$rapid7 = "rapid7.com"
$shodan = "shodan.io"
$packetstorm = "packetstormsecurity"
$crackfor = "crackfor" nocase
$rednoize = "md5.rednoize"
$hashcracking = "hashcracking" nocase
$darkc0de = "darkc0de" nocase
$securityfocus = "securityfocus" nocase
$antichat = "antichat.ru"
$kingdefacer = "KingDefacer" nocase
$md5crack = "md5crack.com"
$md5crack = "md5decrypter.com"
$hashkiller = "hashkiller.com"
$hashchecker = "hashchecker.com"
$fopo = "http://www.fopo.com.ar/"
$ccteam = "ccteam.ru"
$locus = "locus7s.com"
condition:
IsPhp and any of them
}
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