Re: A85: Re: Assembly virus
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Re: A85: Re: Assembly virus
I don't really know much about how it would be done on a calc, but with
unix for instance, most virii are put into directories where they would
be run by the system (on boot, maintence,etc). the filename would then
need to be inserted into some config files, but that could be done with
a trojan. maybe with this, downloading a new shell that lookes just
like usgard or whichever but in actuality is usgard infected with the
virus..
Richard Lewis wrote:
>
> If the Virus code is never executed, then it doesn't do anything.
> Sometimes they'll target a system file when they are run so they'll be run
> more often.
>
> At 06:45 PM 3/10/99 EST, you wrote:
> >
> >Well how do computer viruses work in that regard? That is, if you never
> >directly access the virus, how does it damage your system?
> >
> >Justin Bosch
> >justin-b@juno.com
> >
> >On Mon, 08 Mar 1999 21:50:29 -0700 Richard Lewis
> ><RichardLewis@CedarCity.net> writes:
> >>
> >>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
> >>>>
> >>>>
> >>>>______________________________________________________
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> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >
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> >
> >
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