118 lines
5.2 KiB
Plaintext
118 lines
5.2 KiB
Plaintext
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
|
|
³ VIRUS REPORT ³
|
|
³ Den Zuk ³
|
|
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
|
|
|
|
Synonyms: Venezuelan, The Search.
|
|
|
|
Place of Origin: Indonesia?
|
|
|
|
Host Machine: PC compatibles.
|
|
|
|
Host Files: Remains resident. Infects floppy disk boot sector.
|
|
|
|
OnScreen Symptoms: a purple "DEN ZUK" graphic will appear after a
|
|
CTRL-ALT-DEL is performed if the system has a CGA, EGA, or VGA monitor
|
|
and an infected floppy in drive A:. The rather pretty graphic slides in
|
|
from the sides of the screen.
|
|
|
|
Increase in Size of Infected Files: n/a.
|
|
|
|
Nature of Damage: Affects system run-time operation. Corrupts or
|
|
overwrites boot sector of 360K floppies. The original causes no
|
|
intentional damage. Some variations may reformat a floppy disk after a
|
|
counter reaches a value of 5 to 10 (depending on the version.)
|
|
|
|
Detected by: Scanv56+, F-Prot, IBM Scan, Pro-Scan.
|
|
|
|
Removed by: MDisk, F-Prot, or the DOS SYS command.
|
|
|
|
Derived from: Ohio virus
|
|
|
|
Scan Code: FA 8C C8 8E D8 8E D0 BC 00 F0 FB B8 78 7C 50 C3. You can also
|
|
search at 03EH for BB 90 7C 53 C3 B9 B0 7C 51 C3.
|
|
|
|
Den Zuk (translation: "The Search") was written as an anti-virus
|
|
virus. Its target: Brain infections. When this virus finds a
|
|
Brain-infected diskette, it removes Brain and puts a copy of itself in
|
|
place. It also looks for old versions of itself and "upgrades" them if
|
|
necessary. The virus resides on track 40 on diskettes (normally 360K
|
|
diskettes only have tracks numbered 0-39), and thus takes up no usable
|
|
space.
|
|
|
|
The virus was designed as a boot sector infector that infects 360KB 5
|
|
1/4" floppies. It infects through any access to the host diskette. It can
|
|
survive a warm reboot. It will infect data (non-system) diskettes, which
|
|
in turn can pass on the infection if an accidental attempt to boot from
|
|
the data disk occurs.
|
|
|
|
Den Zuk has a bug which causes it to attempt to infect 3.5"
|
|
diskettes. This will overwrite the diskette's FAT and cause a read (or
|
|
write) failure. It cannot infect a hard disk, and will not attempt to do
|
|
so. If an infected system is rebooted from the hard disk, the virus will
|
|
de-activate. This is not the case with rebooting from a clean floppy -
|
|
which will become infected.
|
|
|
|
Den Zuk demonstrates what can (and will) go wrong with
|
|
anti-virus-viruses. The programmer did not anticipate 1.2M or 3.5"
|
|
diskettes. When the virus infects a disk of that type, it will destroy
|
|
data. Also, several "hacked" versions of this virus have been reported:
|
|
|
|
* One variant will disable the SYS command and destroy all data on
|
|
drive C: on (Friday) September 13, 1991.
|
|
|
|
* Another variant uses a counter which keeps track of how many times
|
|
the system has been rebooted. When the limit is reached (usually 5 to
|
|
10 reboots), the drive A: floppy is reformatted.
|
|
|
|
You may find the following text strings on infected disks:
|
|
|
|
Welcome to the
|
|
|
|
C l u b
|
|
|
|
<197>The HackerS<197>
|
|
|
|
Hackin'
|
|
|
|
All The Time
|
|
|
|
The HackerS
|
|
|
|
If the virus has successfully removed the Brain, the volume label of
|
|
infected diskettes may be changed to "Y.C.1.E.R.P.". The Den Zuk virus
|
|
will also remove an Ohio virus infection before infecting the diskette
|
|
with Den Zuk, presumably because the Ohio is the first draft and a bit
|
|
cruder than Den Zuk.
|
|
|
|
The Den Zuk virus was probably written by the same person as the Ohio
|
|
virus: the "Y.C.1.E.R.P." string is found in the Ohio virus, and the
|
|
viral code is similar in many respects.
|
|
|
|
|
|
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
|
|
º This document was adapted from the book "Computer Viruses", º
|
|
º which is copyright and distributed by the National Computer º
|
|
º Security Association. It contains information compiled from º
|
|
º many sources. To the best of our knowledge, all information º
|
|
º presented here is accurate. º
|
|
º º
|
|
º Please send any updates or corrections to the NCSA, Suite 309, º
|
|
º 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS º
|
|
º and upload the information: (202) 364-1304. Or call us voice at º
|
|
º (202) 364-8252. This version was produced May 22, 1990. º
|
|
º º
|
|
º The NCSA is a non-profit organization dedicated to improving º
|
|
º computer security. Membership in the association is just $45 per º
|
|
º year. Copies of the book "Computer Viruses", which provides º
|
|
º detailed information on over 145 viruses, can be obtained from º
|
|
º the NCSA. Member price: $44; non-member price: $55. º
|
|
º º
|
|
º The document is copyright (c) 1990 NCSA. º
|
|
º º
|
|
º This document may be distributed in any format, providing º
|
|
º this message is not removed or altered. º
|
|
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
|
|
|
|
Downloaded From P-80 International Information Systems 304-744-2253
|