Block SOBER at MTA (postfix)

[Drew Marshall]

On 4 Dec 2005, at 11:22, Dhawal Doshy wrote:

> Hello All,
> A simple body check in postfix will reject all sober.u mails.  
> Create a file
> /etc/postfix/virus_body_checks with this content:
> / 
> ^UEsDBAoAAAAAAACQdjPMyus3XtgAAF7YAAAYAAAARmlsZS1wYWNrZWRfZGF0YUluZm8uZ 
> XhlTV qQ/
>       REJECT VIRUS (W32/Sober.U at MM)

Nice. Smart way to prevent MailScanner swamping as Remco is  
experiencing.

> OR download it from here..
> http://mx2.netmagicians.com/virus_body_checks
> And add this to your /etc/postfix/main.cf
> body_checks = regexp:/etc/postfix/virus_body_checks
> The string UEsDBAoAAAAAAA.... is the first mime encoded line of the  
> sober.u variant. This works well for sober but no 100% strike rate  
> (yet) for netsky.
> Going forward (if the interest exists) i think we ought to maintain  
> this for all supported MTAs and all (possible) new virus outbreaks.

Agreed. Perhaps we can lift some of the regex's from the Clam virus  
definitions? I have no idea how possible this is/ maybe...

Drew

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