Re: A85: Re: Assembly virus

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Re: Assembly virus
From: Richard Lewis <RichardLewis@CedarCity.net>
Date: Mon, 08 Mar 1999 21:50:29 -0700
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@lists.ticalc.org
In-Reply-To: <000401be69d9$fa55cfa0$6c4219d1@michaelp.dfw.tx.i3s.net.>
Reply-To: assembly-85@lists.ticalc.org


I might be able to make an Usgard specific virus that attaches itself to
the shell and refuses to be removed.  I could make it so it attacks the
menu system and reloads itself every time you use it.  Some slight
modifications to the Usgard string would make it impossible to remove.  But
it would have to be run from Usgard at least once on every calc...

At 09:07 PM 3/8/99 -0600, you wrote:
>
>I think most of us probably crash our calculators every day anyways :(.
>Certainly you could write a virus.  I would think it would be more fun to
>write one that just made all of the variables grow, little by little.  Or
>maybe it did nothing but spread itself across during file transfer.  Once
>you crash someone's calc, it would be harder to pass it on to the next
>person.  Anyways, learn some assembly and you can then program your own
>virus.  Good luck (but i don't really think writing most viruses requires
>too many "mad skillz").
>
>-mike pearce
>
>-----Original Message-----
>From: Matt Cooper <mnemonicdevice@hotmail.com>
>To: assembly-85@lists.ticalc.org <assembly-85@lists.ticalc.org>
>Date: Monday, March 08, 1999 8:28 PM
>Subject: A85: Assembly virus
>
>
>>
>>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
>>
>>
>>______________________________________________________
>>Get Your Private, Free Email at http://www.hotmail.com
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>
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>
>
>

References:

A85: Re: Assembly virus

From: "Michael Pearce" <mpearce@bbnow.net>