Article View: comp.virus
Article #4167Invalid Disk Boot Sectors. (PC)
From: Roger Riordan
Date: Thu, 17 Dec 1992 22:29
Date: Thu, 17 Dec 1992 22:29
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1352 bytes
In a recent comment on a query by MOPURC01@ULKYVM.LOUISVILLE.EDU (Michael Purcell) about a virus which allegedly made disks unreadable I wrote. > If you put the wrong byte in the wrong place you can get the > symptoms described. ... We have since established that if you set the sectors per cluster field (offset 0dh) in the BIOS Parameter Block to zero in the boot sector of an otherwise normal disk all versions of DOS will crash immediately you try to access the disk. All utilities we have tested also crash. You can format the disk with DOS 3 & 4 but Format will crash under DOS 5 unless you use the /u option. F-Prot, Dr. Solomon's Toolkit, & McAfee Scan all crash. VET crashes too, but we are working on it! Roger Riordan riordan.cybec@tmxmelb.mhs.oz.au CYBEC Pty Ltd. Tel: +613 521 0655 PO Box 205, Hampton Vic 3188 AUSTRALIA Fax: +613 521 0727
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arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!spool.mu.edu!yale.edu!jvnc.net!netnews.upenn.edu!netnews.cc.lehigh.edu!newsShow Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!spool.mu.edu!yale.edu!jvnc.net!netnews.upenn.edu!netnews.cc.lehigh.edu!news From: riordan.cybec@tmx.mhs.oz.au (Roger Riordan) Newsgroups: comp.virus Subject: Invalid Disk Boot Sectors. (PC) Message-ID: <0002.9212212018.AA02123@barnabas.cert.org> Date: 17 Dec 92 22:29:49 GMT Sender: virus-l@lehigh.edu Lines: 21 Approved: news@netnews.cc.lehigh.edu