B & R Y C Li
Discussed in this article goes on progpammah VIRUS and
VIRUS II, but about the present computer viruses, well,
straight as to iBM PC!
It was long thought that in the TR-DOS viruses can not be
(which, in Basically, right). Rather, generally believed that
viruses - it is destiny PC. And now there was information that
the game LAST BATTLE there is a virus! " Checking the
information, I discovered that.
In fact, viruses in TR-DOS is not quite
correct, these viruses of all kinds
on SPECCY can be arranged only in the
systems iS-DOS and CP / M (not sewn in
ROM). Except for the model SCORPION,
ATM, PENTAGON 512K + "shadow RAM" instead of
PZUshki printer, then in the TR-DOS
You can write only file viruses,
run before the execution of an infected program. Resident
viruses in a standard SPECCY impossible.
Due to the nature and SPECCY TRDOS (ie, run only
BASIC-files) contamination of code blocks is unrealistic and
possibly infecting BASIC-only files. Technology infection is
simple: 1) is sought BASIC file;
2) to scan for viruses and if
it is not already there, then a blank space on
disk is stored the body of the virus in the file header changes
the length and initial Track / sector file and stored in the
body virus, the normal length and the track / sector.
Then, in the first line of BASIC is entered
transition to a launch of the virus. Oposlya changed
information is written to disk, and returns control to the
program from is caused by a virus.
Disadvantages of such a virus is obvious.
These include changes in length
BASIC-file (in sectors), the inability to
infect programs on another drive (on the
systems with a single drive) and inability to infect other
programs, if no hard drive space or data on disk is shown that
there is no free space. Also, If you implement a virus on the
above scheme, it is copying to another drive will not work. At
Last Battle virus works on several other
scheme, although very similar. Once launched, the virus, he
primarily looks for boot and tries to infect it, and only
then makes his case further, ie,
BASIC-looking files. When looking for is
check the file length in sectors and if
length is large enough, then the transmission is
Occurs (that's the answer to those who wrote
except for "bottle" has some game in
monoloaderah). In carrying out not
scrutiny, it was determined that
size in 18 sectors and is large enough that the program has
acquired immunity. If the file is suitable in size, it
checked for infection (in the verification
involve only three bytes) and if not infected, then the fun
begins. The first line of bend varies with the fact
to ensure the launch of the virus, the virus body is generated,
connects to infects programs into a block equal to the length
BASIC'a sectors + 8, and writes it the case for free space.
After this is corrected directory of the drive and all
repeated again, until then, until the directory is reached. In
theory the virus of the "bottle" is capable of infecting once
all BASIC-files on the disk.
As you can see the virus in general, simple,
but even in the form as it is now, he can
bring trouble. To cite one example of life: come to us from
Flash'ey CDs sistemkami, and found that several (maybe at the
beginning of one) are infected with "drunken genie" (my name
for this virus / I think it sounds'). Although he with them
does not show, RAY, having sad experiences with the "drunken
genie", decided to produce a course of treatment. Those ogy was
simple: start the BASIC, slowing down it, and if you get what
We expect to see, then ship our BASIC in
blank disc. That's all treatments. Who does not
able to disinfect itself, bring
(Send) us, we can help.
To summarize: Viruses on the Spectrum
there. Known for a virus written
HACKER SQUAD ("Drunk genie"). Distinguishing features: an
increase in length by 8 (in sectors), infection with only short
BASIC-files, increasing the load time
an infected program. First appeared
in the game "Last Battle". Editorial Board
invites everyone to vyskazatsya
about viruses on the page ADVENTURER'a.
ADV: By the way, we have a packed and
obezvirusennaya (in, skazanul!) version
LAST BATTLE. If anyone should ...
(C) SHRSOFT
