Re: A85: Assembly virus

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Assembly virus
From: khalil@fet.ju.edu.jo
Date: Wed, 10 Mar 1999 11:48:21 -0200
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@lists.ticalc.org
Reply-To: assembly-85@lists.ticalc.org


 There is no reason to do such thing, to crash calc... every body saves a
lot of info on his calc... nevertheless I agree to discuss how to implement
such project...

one more thing...it has not been done before not because it can't be
implemented but because to keep this area clean.....


At 06:28 PM 3/8/99 PST, you wrote:
>
>Alright, I know this couldn't possibly work else it would have been done 
>before, but why couldn't someone write code that would use Usgard's TSR 
>calls to attach itself to the system and then wreak havoc with the 
>system somehow.  My thought was perhaps have it increment a 32bit 
>location, then read a 16bit location which is the less-significant side 
>of the 32bit value.  If that 16bit value = 00 (basically.. the 256th 
>time Usgard is loaded) then hang the system.  Or delete variables.  Or 
>diddle the first 7 bytes of Usgard so that IT will hang the calc.  Etc.
>
>I don't have the mad skillz to do this, but if I did, I would!
>
>--Matt Cooper
>
>
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