Block SOBER at MTA (postfix)

[Dhawal Doshy]

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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: 

/^UEsDBAoAAAAAAACQdjPMyus3XtgAAF7YAAAYAAAARmlsZS1wYWNrZWRfZGF0YUluZm8uZXhlTV 
qQ/
       REJECT VIRUS (W32/Sober.U at MM) 

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. 

 - dhawal

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