Jay D. Dyson writes:
 > On 27 Nov 2001, Derek Atkins wrote: 
 > 
 > > Hrm, how about a worm with a built-in HTTP server that installs itself
 > > on some non-standard port, say TCP/28462 (to pick one at random)? 
 > 
 >      Craftier still, backdoor an existing service that behaves normally
 > until it receives a few specially-crafted packets, then it opens a high
 > port for direct login or data retrieval.

Neither of these will get past a firewall on an uncompromised machine.



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