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- Path: sparky!uunet!gatech!enterpoop.mit.edu!eru.mt.luth.se!kth.se!sunic!isgate!complex!frisk
- From: frisk@complex.is (Fridrik Skulason)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: Viruses, viruses!
- Keywords: Virus Stoned
- Message-ID: <182@complex.complex.is>
- Date: 31 Dec 92 15:20:13 GMT
- References: <1htpooINN2jp@crcnis1.unl.edu>
- Organization: Frisk Software International, Iceland
- Lines: 41
-
- The Gipsy Scholar (Bruce Bathurst, bathurst@phoenix.princeton.edu),
- writes:
-
- > Last week a friend asked me to fix a floppy--an original disk from
- > a commercial program. The boot record (and following sector) had
- > unusual code, so I suspected a boot-record virus. Because no
- > messages were displayed on his screen, I guessed it was the Stoned
- > virus, and checked the spot it places the correct boot record.
- > There was code--out of place--but different from the correct boot
- > code and different from that in the first sector. This was
- > Michelangelo. The poor floppy caught one, then the other.
-
- Well, you are not the first person to have this problem - I have seen several
- reports of it elsewhere. The "Stoned" virus has been around for a long time,
- and with Michelangelo slowly becoming more common, others will have it too.
-
- The real problem starts when a hard disk gets infected by both, as the
- viruses attempt to relocate the original MBR to the same location (0,0,7),
- with the result that wen the second virus infects the system, the original
- MBR is lost, and the machine becomes non-bootable, which is usually how
- the double-infection is discovered :-)
-
- It is not a proper double-infection, though, as the viruses are not
- compatible with each other, but as I said it happens occasionally.
-
- > don't surprise your computer. In principle, if you insert a
- > floppy with a boot-record infection and type "C:\DOS>dir a:",
- > your machine can be infected.
-
- Well, no ... the boot sector is read into memory, and if you run a virus
- scanner it may report "Stoned was found in memory", but the machine is not
- infected.
-
- It is *possible* to become infected just by giving a DIR command, but only
- by using a really weird trick when creating the diskette originally, which
- I will not (for obvious reasons) describe here.
-
- --
- --
- Fridrik Skulason Frisk Software International phone: +354-1-694749
- Author of F-PROT E-mail: frisk@complex.is fax: +354-1-28801
-