118 lines
5.2 KiB
Plaintext
118 lines
5.2 KiB
Plaintext
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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³ VIRUS REPORT ³
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³ Den Zuk ³
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ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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Synonyms: Venezuelan, The Search.
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Place of Origin: Indonesia?
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Host Machine: PC compatibles.
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Host Files: Remains resident. Infects floppy disk boot sector.
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OnScreen Symptoms: a purple "DEN ZUK" graphic will appear after a
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CTRL-ALT-DEL is performed if the system has a CGA, EGA, or VGA monitor
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and an infected floppy in drive A:. The rather pretty graphic slides in
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from the sides of the screen.
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Increase in Size of Infected Files: n/a.
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Nature of Damage: Affects system run-time operation. Corrupts or
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overwrites boot sector of 360K floppies. The original causes no
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intentional damage. Some variations may reformat a floppy disk after a
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counter reaches a value of 5 to 10 (depending on the version.)
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Detected by: Scanv56+, F-Prot, IBM Scan, Pro-Scan.
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Removed by: MDisk, F-Prot, or the DOS SYS command.
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Derived from: Ohio virus
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Scan Code: FA 8C C8 8E D8 8E D0 BC 00 F0 FB B8 78 7C 50 C3. You can also
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search at 03EH for BB 90 7C 53 C3 B9 B0 7C 51 C3.
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Den Zuk (translation: "The Search") was written as an anti-virus
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virus. Its target: Brain infections. When this virus finds a
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Brain-infected diskette, it removes Brain and puts a copy of itself in
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place. It also looks for old versions of itself and "upgrades" them if
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necessary. The virus resides on track 40 on diskettes (normally 360K
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diskettes only have tracks numbered 0-39), and thus takes up no usable
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space.
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The virus was designed as a boot sector infector that infects 360KB 5
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1/4" floppies. It infects through any access to the host diskette. It can
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survive a warm reboot. It will infect data (non-system) diskettes, which
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in turn can pass on the infection if an accidental attempt to boot from
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the data disk occurs.
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Den Zuk has a bug which causes it to attempt to infect 3.5"
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diskettes. This will overwrite the diskette's FAT and cause a read (or
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write) failure. It cannot infect a hard disk, and will not attempt to do
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so. If an infected system is rebooted from the hard disk, the virus will
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de-activate. This is not the case with rebooting from a clean floppy -
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which will become infected.
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Den Zuk demonstrates what can (and will) go wrong with
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anti-virus-viruses. The programmer did not anticipate 1.2M or 3.5"
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diskettes. When the virus infects a disk of that type, it will destroy
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data. Also, several "hacked" versions of this virus have been reported:
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* One variant will disable the SYS command and destroy all data on
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drive C: on (Friday) September 13, 1991.
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* Another variant uses a counter which keeps track of how many times
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the system has been rebooted. When the limit is reached (usually 5 to
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10 reboots), the drive A: floppy is reformatted.
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You may find the following text strings on infected disks:
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Welcome to the
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C l u b
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<197>The HackerS<197>
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Hackin'
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All The Time
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The HackerS
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If the virus has successfully removed the Brain, the volume label of
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infected diskettes may be changed to "Y.C.1.E.R.P.". The Den Zuk virus
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will also remove an Ohio virus infection before infecting the diskette
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with Den Zuk, presumably because the Ohio is the first draft and a bit
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cruder than Den Zuk.
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The Den Zuk virus was probably written by the same person as the Ohio
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virus: the "Y.C.1.E.R.P." string is found in the Ohio virus, and the
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viral code is similar in many respects.
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ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
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º This document was adapted from the book "Computer Viruses", º
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º which is copyright and distributed by the National Computer º
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º Security Association. It contains information compiled from º
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º many sources. To the best of our knowledge, all information º
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º presented here is accurate. º
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º º
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º Please send any updates or corrections to the NCSA, Suite 309, º
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º 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS º
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º and upload the information: (202) 364-1304. Or call us voice at º
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º (202) 364-8252. This version was produced May 22, 1990. º
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º º
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º The NCSA is a non-profit organization dedicated to improving º
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º computer security. Membership in the association is just $45 per º
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º year. Copies of the book "Computer Viruses", which provides º
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º detailed information on over 145 viruses, can be obtained from º
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º the NCSA. Member price: $44; non-member price: $55. º
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º º
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º The document is copyright (c) 1990 NCSA. º
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º º
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º This document may be distributed in any format, providing º
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º this message is not removed or altered. º
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ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
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