Question regarding Filename Rules

Denis Beauchemin Denis.Beauchemin at USHERBROOKE.CA
Wed Apr 20 14:03:15 IST 2005

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Julian Field wrote:

> Denis Beauchemin wrote:
>> Rob Poe wrote:
>>> I guess the thing about it is this:
>>> If we're blocking executable files, then how would that rule help?
>>> I'm not being argumentative .. Just curious..
>> Rob,
>> I run with that rule turned off because it caused too much trouble BUT
>> I block all executables (pif, bat, exe, ...).  Turns out I was never
>> caught off guard, even with slow antivirus updates.
> The other important thing to remember is that the "executable" block in
> filetype.conf will help you a lot here too, for when they evade your
> filename traps with a bit of social engineering (e.g. _exe instead of 
> .exe).


I agree with you on this but I don't use filetype.conf because for now 
there are no viruses that ask people to rename _exe inti .exe.  I also 
tell people to rename their .exe into something else if they want them 
to pass through my servers.

As soon as one virus goes that route I will have to activate 
filetype.conf but I predict my users won't like it... But implementing 
security measures has always been PITA for users.


  °v°   Denis Beauchemin, analyste
 /(_)\  Université de Sherbrooke, S.T.I.
  ^ ^   T: 819.821.8000x2252 F: 819.821.8045

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