Path: utzoo!attcan!uunet!husc6!mailrus!tut.cis.ohio-state.edu!ucbvax!NIEHS.BITNET!ALBRO
From: ALBRO@NIEHS.BITNET
Newsgroups: comp.sys.apple
Subject: RE: Re: A+ Virus Article (mostly for Morgan Davis)
Message-ID: <8903121224.aa03512@SMOKE.BRL.MIL>
Date: 12 Mar 89 17:22:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 8

art100@psuvm.bitnet / alt@ecl.psu.edu wrote about the possibility of putting
a virus in machine language attached at the end of a BASIC program and
therefore invisible to the LIST command.  Quite possible, but somewhere in
the program there will have to be a CALL to somewhere you didn't load any
code, which would be a dead give-away.  All you have to do is list the
BASIC program into a text file and EXEC it back, then resave it and you get
rid of appended, unlistable code (assuming it isn't perfectly innocent and
required for the program.)