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malwares.yara
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malwares.yara
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import "hash"
include "whitelist.yara"
/*
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/
*/
global private rule IsPhp
{
strings:
$php = /<\?[^x]/
condition:
$php and filesize < 5MB
}
private rule IRC
{
strings:
$ = "USER" fullword
$ = "PASS" fullword
$ = "PRIVMSG" fullword
$ = "MODE" fullword
$ = "PING" fullword
$ = "PONG" fullword
$ = "JOIN" fullword
$ = "PART" fullword
condition:
5 of them
}
private rule CloudFlareBypass
{
strings:
$ = "chk_jschl"
$ = "jschl_vc"
$ = "jschl_answer"
condition:
2 of them // Better be safe than sorry
}
rule ObfuscatedPhp
{
strings:
$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
$c99_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:
any of them and not IsWhitelisted
}
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:
base64 or hex
}
rule DodgyPhp
{
strings:
$vars = /\$___+/ // $__ is rarely used in legitimate scripts
$execution = /(eval|assert|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:
(any of them or CloudFlareBypass) and not IsWhitelisted
}
rule DangerousPhp
{
strings:
$system = "system" fullword // localroot bruteforcers have a lot of this
$ = "exec" fullword
$ = "eval" fullword
$ = "shell_exec" fullword
$ = "passthru" fullword
$ = "posix_getuid" fullword
$ = "posix_geteuid" fullword
$ = "posix_getgid" fullword
$ = "phpinfo" fullword
$ = "backticks" fullword
$ = "proc_open" fullword
$ = "win_shell_execute" fullword
$ = "win32_create_service" fullword
$ = "posix_getpwuid" fullword
$ = "shm_open" fullword
$ = "assert" fullword
$ = "fsockopen" fullword
$ = "function_exists" fullword
$ = "getmygid" fullword
$ = "php_uname" fullword
$ = "socket_create(AF_INET, SOCK_STREAM, SOL_TCP)"
$ = "fpassthru" fullword
$ = "posix_setuid" fullword
$ = "xmlrpc_decode" fullword
$ = "show_source" fullword
$ = "pcntl_exec" fullword
$ = "array_filter" fullword
$whitelist = /escapeshellcmd|escapeshellarg/
condition:
not $whitelist and (5 of them or #system > 250) and not IsWhitelisted
}
rule DodgyStrings
{
strings:
$ = "/etc/passwd"
$ = "/etc/shadow"
$ = "/etc/resolv.conf"
$ = "/etc/syslog.conf"
$ = "/etc/proftpd.conf"
$ = "WinExec"
$ = "uname -a" fullword
$ = "nc -l" fullword
$ = "ls -la" fullword
$ = "cmd.exe" fullword nocase
$ = "ipconfig" fullword nocase
$ = "find . -type f" fullword
$ = "defaced" fullword nocase
$ = "slowloris" fullword nocase
$ = "id_rsa" fullword
$ = "backdoor" fullword nocase
$ = "webshell" fullword nocase
$ = "exploit" fullword nocase
$ = "hacking" fullword nocase
$ = "/proc/cpuinfo" fullword
$ = "/bin/sh" fullword
$ = "/bin/bash" fullword
$ = "ps -aux" fullword
$ = "b374k" fullword
$ = /(reverse|web)\s*shell/ nocase
$vbs = /language\s*=\s*vbscript/ nocase
$asp = "scripting.filesystemobject" nocase
condition:
IRC or 2 of them and not IsWhitelisted
}
rule Websites
{
strings:
$ = "milw0rm.com"
$ = "exploit-db.com"
$ = "1337day.com"
$ = "rapid7.com"
$ = "shodan.io"
$ = "packetstormsecurity"
$ = "crackfor" nocase
$ = "md5.rednoize"
$ = "hashcracking" nocase
$ = "darkc0de" nocase
$ = "securityfocus" nocase
$ = "antichat.ru"
$ = "KingDefacer" nocase
$ = "md5crack.com"
$ = "md5decrypter.com"
$ = "hashkiller.com"
$ = "hashchecker.com"
$ = "www.fopo.com.ar" /* Free Online Php Obfuscator */
$ = "ccteam.ru"
$ = "locus7s.com"
condition:
any of them and not IsWhitelisted
}