[comp.virus] Linkable virus modules

IA96@PACE.BITNET (IA96000) (11/28/89)

I have heard of, nor have I ever found any modules which were
specifically linked into a program, but I would like some of the
experts to comment on the following possibility:

1) A new or existing virus is developed and produced as a linkable
   object file.

2) Said object file is then either directly linked into an executable
   file at link time, or placed in a run-time library.

Is this even a remote possibility? If so, does anyone have any examples
or know of any examples where this has been done?

I would really like to gather opinions and comments on this possibility.

johng@uunet.UU.NET (John Gardner) (12/04/89)

IA96@PACE.BITNET (IA96000) writes:
>1) A new or existing virus is developed and produced as a linkable
>   object file.
>
>2) Said object file is then either directly linked into an executable
>   file at link time, or placed in a run-time library.

There is a virus on the amiga that looks for an executable that is in the
startup batch file and moves the executable`s code into a data segment and
inserts itself into the code segment.  If it can't find the startup file
it then inserts itself into the dir command.  It is easy to spot as one
of your commands changes size, and you just have to delete that command to
kill it.

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