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Network Security Security-Basics
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RE: Blocking Instant Messaging Applications

Subject: RE: Blocking Instant Messaging Applications
Date: Thu, 24 Nov 2005 08:11:32 +0530

Hi Nick--do you use the hash of the binary because there's a 
way round it if you just used the .exe name? 
So clever users can rename the file and be back
online?

Also the hash mechanism would also be very easily defeated with 
Reshacker or even with echo. >> exefilename.exe 

This would keep the file working and alter the hash of the file



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