the giant black book of computer viruses phần 6 pot
the giant black book of computer viruses phần 6 pot
... data at the end of the file where
the virus is hiding, the virus can defeat the read, or simply truncate
it so that only the host is read.
If the read requests data at the beginning of the file, ... to the file size. It adds enough bytes
at the end of the file so that the number added at the start plus the
end is always equal to 16. Then it can simply subtr...
the giant black book of computer viruses phần 3 potx
... free at the time of the
;execution of the boot sector.
ORG 0500H
DISK_BUF: DB ? ;Start of the buffer
;Here is the start of the boot sector code. This is the chunk we will take out
;of the compiled ... takes
the form that the sector/cylinder number in a call to the
BIOS INT 13H read would require in the cx register, e.g.,
the sector number is in the low...
the giant black book of computer viruses phần 4 potx
... writes. First, DEVIRUS finds the end of the host file and uses
that as the offset for the new STRAT routine, writing this value into
the header. Next it hides the address of the old STRAT routine
internally ... STRAT routine
internally in itself at STRJMP, and then writes the body of its code
to the end of the SYS file. That’s all there is to it. The logic of
D...
the giant black book of computer viruses phần 5 pot
... code
virush[] properly. The trick is to put a null in it right after the
opening bracket of the declaration of virush[]:
static char virush[]={49,52,
. . . . .
63 ,68 ,61 ,72,20, 76, 69,72,75,73 ,68 ,5B,5D,3D,7B,0,7D,
(c ... function and
then disassemble it.
the virus is run. Thus, all of Developer A and Developer B’s clients
could suffer loss from the virus, regardless o...
the giant black book of computer viruses phần 7 pot
... such techniques in the
early 90’s. Some of the first viruses which employed such tech-
niques were the 1 260 or V2P2 series of viruses. Before long, a
Bulgarian who called himself the Dark Avenger ... bytes)
and so on.
Potentially RAND_INSTR will need classes with very limited
capability, like (1), so we should include them. At the other end of
the scale, the fancier yo...
the giant black book of computer viruses phần 8 pot
... in the directory where the file is missing, and you don’t
have integrity data for any of them anymore. You scan them, sure,
but the scanner turns up nothing. Why was the file missing? Are
any of ... much work.
All one has to do is calculate the size of the file from the EXE
header, rather than from the file system, and use that to add the virus
to the file. An altern...
the giant black book of computer viruses phần 1 ppsx
... far. Not so, the computer virus, because
it attaches itself to otherwise useful programs. The computer user
will execute these programs in the normal course of using the
computer, and the virus ... autonomous from man was the science fiction of the 1950’s
and 1 960 ’s. However, with computer viruses it has become the
reality of the 1990’s. Just the idea that...
the giant black book of computer viruses phần 2 pdf
... relative to the start of
the code in the EXE file. This
is relocated by DOS at load time.
18H 2 Reloc Tbl Offset Offset of the start of the
relocation table from the start
of the file, in ... in the EXE Header, to the
location of HOSTS on disk in the above code.
5. Write the initial value of cs:ip in the EXE Header to the location
of HOSTC on disk in...
the giant black book of computer viruses phần 9 pdf
... 193,45,129,137,84,159,159, 166 ,69 , 161 ,242,81,190,54,185,1 96, 58,151,49,
1 16, 131,19, 166 , 16, 251,188,125,1 16, 239,1 26, 69,113,5,3,171,73,52,114,252,
172,2 26, 23,133,180 ,69 ,190,59,148,152,2 46, 44,9,249,251,1 96, 85,39,154,184,
... 83,225,24,23,202,111,209,77,29,17,234,188,171,187,138,195, 16, 74,142,185,
111,155,2 46, 10,222,90 ,67 , 166 ,65 ,103,151 ,65 ,147,84,83,241,181,23...
the giant black book of computer viruses phần 10 doc
... follows: al=0 moves the pointer relative to
the beginning of the file, al=1 moves the pointer relative to the current
location, al=2 moves the pointer relative to the end of the file.
Function ... Publications, Inc. for use in The Giant Black Book
;of Computer Viruses
;
;Version 1.00
; Initial release - beta only
;Version 1.01
; Upgrade to fix a number of bu...
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