A85: Assembly virus

To: assembly-85@lists.ticalc.org
Subject: A85: Assembly virus
From: "Matt Cooper" <mnemonicdevice@hotmail.com>
Date: Mon, 08 Mar 1999 18:28:22 PST
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@lists.ticalc.org
Reply-To: assembly-85@lists.ticalc.org


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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