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Article #19879

Clock glitch or...virus?

#19879
From: Michael Hemy
Date: Mon, 11 Jan 1993 19:39
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Yesterday when using my computer, I noticed that the time was wrong.
It was not wrong by 1 or 2 seconds but by a FULL HOUR ! I checked the
RTC (real-time clock) and it was correct. So I began wondering what made the
DOS time SO different. This was extremely peculiar since you usually
expect the DOS time to LAG after the real-time clock, and here I had
it AHEAD of it.

My first reaction was that there might be a virus lurking in my
computer but after thinking about it some more, I came with the following
theory:

Since DOS is getting it's time initially from the RTC at boot-time, it
may be that it is doing so in two (or more) stages, such that first it
reads the minutes and then the hours. If this is true and I turned my
computer on at 11:59 pm, then it may have read 59 minutes and when it
got to read the hours it was 00 (am) already, so that it thought the
time was 00:59 am.

Can someone that knows DOS internals, shed some light on this or...
can some virus expert say something about that phenomenon ?

--Michael
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From: mhemy+@cs.cmu.edu (Michael Hemy)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Clock glitch or...virus?
Message-ID: <C0pFy0.Lsx.1@cs.cmu.edu>
Date: 11 Jan 93 19:39:29 GMT
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