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From: CHESS@YKTVMV.BITNET (David.M.Chess)
Newsgroups: comp.virus
Subject: Disk write loses 10 characters --- a virus? (PC)
Message-ID: <0003.9010051545.AA02613@ubu.cert.sei.cmu.edu>
Date: 4 Oct 90 19:21:23 GMT
Sender: Virus Discussion List <VIRUS-L@LEHIIBM1>
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Approved: krvw@sei.cmu.edu

stephenc@cunixf.cc.columbia.edu (Stephen Chung) asks if file writes
mysteriously losing the first 10 characters might be a virus.  It
certainly might!  The 9800:0000 virus (aka 1559) does that; I seem to
recall it does it whenever the month is Sept-Dec, although it might be
Oct-Dec.  Any good virus scanner should be able to find the infected
files for you, if that is indeed your problem.  Also just look for
files that are larger than they ought to be; it adds about 1559 bytes
to both COM and EXE files.  DC