...The Pakistani Brain Virus

This boot sector infector virus has afflicted IBM PC and compatible systems
around the world since 1986 and is very infectious.  The first symptoms are 
often excessive activity by the floppy disk drives when they should not be
busy at all.

The Pakistani virus produced the following message when disassembled and
analyzed.  Not only is it one of the cleverest viruses written so far, it also
is unusual in giving such clear identification of the originators.

...Welcome to the Dungeon
..   c 1986 Basit & Amjad (pvt) Ltd.
..        BRAIN COMPUTER SERVICES
...   730 Nizam Block
      ...  Allama Igbal Town
...   Lahore, Pakistan
..    Phone: 430791,443248,2800530
... Beware of this VIRUS
..     Contact us for vaccination

...the announcement [was] right up front on the copyright notice near the
top of the directory... the volume label had been changed to read 
"(c) Brain."

The Pakistani Brain is one of the most complex viruses ever created.  It has
built-in structures to prevent it from being identified, destroyed, or damaged.
It very effectively executes its prime directive to replicate to as many 
computer systems as possible.  The Brain moves from its initial control point
through a number of modules that set up the system to prepare them for the
Brain to take further control.  A second segment of the virus program is used
to infect other systems; the appropriate segment of code is activated and the
entire virus is then transferred to the new host.

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"Computer Viruses, Worms, Data Diddlers, Killer Programs, and Other Threats
To Your System: What They Are, How They Work, And How To Defend your PC, Mac,
Or Mainframe."  McAfee, John and Colin Haynes. (C) 1989 by John McAfee and
Colin Haynes.  St. Martin's Press.  p. 92-94.
