eldar@lomi.spb.su (Eldar A. Musaev) (02/28/91)
Adding to the note of Fridrik Skulason (v.4 i.31) This 'compucilina' will not prevent infection either you'll boot from floppy or hard disk. Most of the resident viruses infect a victim before execution at int 21/4B as a simple file which can be modified (read: infected), and only after that the victim (and compucilina) would get a control and found many problems. I beleive that compucilina could restore the victim in some cases, but not in ALL cases. E.g. the virus can be so purely written, that it simply spoils file sometimes instead of infecting it. And how does compucilina fight with spawning (in terms of Patricia Hoffman) viruses ? These viruses does not modify the exe-file, but make a COM-twin of the file with viral code. If you execute such infected program, MS-DOS loads COM-file. It does the viral work and after that loads and execute the host program, which cannot determine any traces of the virus in itself. At the end, such a trick is well-known. I know at least 3 analogs of compucilina in the SU with the first one dated at least at 1989. Sorry, but I'm tired of commercial advertisments here in the SU, maybe let us a little rest ? Eldar A. Musaev, Ph.D., Researcher, eldar@lomi.spb.su Mathematical Institute of Academy of Sciences, Leningrad, USSR