Home » Archimedes archive » Micro User » MU 1991-08.adf » !VKiller/Docs/!ReadMe

!VKiller/Docs/!ReadMe

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Archimedes archive » Micro User » MU 1991-08.adf
Filename: !VKiller/Docs/!ReadMe
Read OK:
File size: 35E2 bytes
Load address: FFFFFF43
Exec address: 6D3961D7
Duplicates

There is 1 duplicate copy of this file in the archive:

File contents
All code and documentation is exclusively (C) Richard K. Lloyd 1991.
It is freely distributable.

Documentation for VKiller 2.20 - A Virus Killer/Innoculator
-----------------------------------------------------------

PLEASE NOTE: This distribution does NOT contain any virus to the author's
             knowledge.

VKiller is dedicated to Christine Wein, an American friend who's put up with
my trivia for far too long ! Obviously the Army thought so too, because they
"released" her early (May 5th)...

Introduction
------------

Computer viruses are annoying...and that's putting it mildly. They put the
machine's owner on constant guard for infections - usually excessive disk
activity and strangely behaving programs are tell-tale signs. Even though
the Archimedes has a ROM-based OS and hence no boot tracks on a disk, the
door is still wide open for the virus writer to attack Obey files or even
executables themselves.

This is why VKiller was written, although a virus killer program is in no way
an original idea :-) Because of the nature of Archimedes virus attacks, files
can often be "innoculated", but more about that later.

Viruses known to VKiller
------------------------

VKiller 2.20 currently knows about the following viruses:

Extend Virus - attacks Desktop !Boot files and duplicates its module into the
               application directory. Infects whenever an application is
               double-clicked on. Claims 1K of RMA for every file or dir
               double-click, which it never releases, hence crashing the
               machine eventually. Can be innoculated against using a &FF byte.

ArchieVirus  - attacks Absolute executables - appending itself to the end
               and replacing the first instruction with a branch to its code.
               Infects any executable in the current or library directories
               on any file load or save, hence causing excessive floppy
               activity. Lodges itself in RMA to allow its claim of OS_File 36
               to persist. Displays an infinitely looping message on the 13th
               of any month. Can be innoculated against by appending a "1210"
               string (actually "Hypo1210"). My copy of ArchieVirus has faulty
               code and causes system errors on any subsequent OS_File calls.

CeBit Virus  - attacks !Boot files and duplicates its module into the
               application directory pointed to by the current setting of
               <Obey$Dir>. Performs an infection of <Obey$Dir> EVERY MINUTE
               and, after 16 successful new infections, attempts to perform a
               "*Wipe $.path.file*" (which is clearly doomed to fail !),
               followed by a graphical message. Despite the wrong filespec for
               the *Wipe command, this is a *nasty* virus and impossible to
               sensibly permanently innoculate against.

Vigay Virus  - creates an !Boot file (only if doesn't exist already) and copies
               itself (a 2K BASIC program) into the application directory.
               Initialises as a Wimp Task and infects whenever an application
               is run. Only thing it does is to pick a random time on a
               Thursday to "wobble" your screen and mouse pointer (more
               frequently as the day progresses) !! Innoculated against by
               creating an !Boot (VKiller puts the Extend Virus innoculation in
               too).

WARNING: If ArchieVirus is present in RMA, then V2.20 of VKiller cannot remove
         it from RMA (this may be remedied in a future release). However,
         VKiller will display a dialogue box explaining that a hard reset
         (followed by a re-run of VKiller ONLY) is required and will then
         fatally exit.

Further Information
-------------------

The other documentation (in this "Docs" directory) available is as follows:

ArchieDoc   - Technical documentation relating to ArchieVirus.

CeBitDoc    - Technical documentation relating to the CeBit Virus.

Credits     - List of people contributing ideas, code fixes or new viruses.

ExtendDoc   - Technical documentation relating to the Extend Virus.

History     - Revision History of VKiller.

Notice      - Copyright Notice (PD organisations should read this, as should
              people requesting newer versions or supplying fixes/enhancements)

VigayDoc    - Technical documentation relating to the Vigay Virus.

Recommended procedures prior to running VKiller
-----------------------------------------------

Floppy disk users
-----------------

* Hard-reset (CTRL-BREAK or CTRL-RESET) your machine. No known virus can
  survive this.

* Keep a "secure" copy of the latest VKiller on a clearly marked, write-
  protected floppy disk. Do NOT put *any* other programs on that disk.

* On entry to the Desktop, ONLY open the file viewer of the disk containing
  the "secure" copy of VKiller. Do *not* open any other viewers.

* Run VKiller (with a double-click) as soon as you've opened the file viewer.
  After this, file viewer restrictions can be relaxed, because VKiller will
  pick up on any viruses it knows about that are run via !Boot files.

* Scan the VKiller floppy disk first. This is an optional precaution for very
  wary users :-)

* If you wish to log the scanning, ensure that you have a RAM disk active and
  that it has 32K or more free before you toggle the "Create log file" option.

* Feed in floppies one at a time and scan them. Avoid the temptation to open
  the file viewers on them unless absolutely necessary. It is advisable to
  write-protect these floppies and only write-enable them if VKiller brings up
  a warning box asking for a retry of the disk write.

Hard disk users
---------------

* Follow the same precautions as above, but it is OK to copy VKiller onto your
  hard disk. HOWEVER, this means you will have to open file viewers to get to
  VKiller itself, which leaves you vulnerable to running !Boot-infecting
  viruses.

* The scan logging speed to hard disk is acceptable enough to avoid having to
  concern yourself with the RAM disk free space. You are advised to make sure
  you have "seen" an editor such as !Edit prior to any logging (easiest
  solution is to put !Edit at the top level of your hard disk or in the same
  dir as VKiller).

How do I use VKiller ?
----------------------

Double-click on the !VKiller application icon to install an icon bar icon.
[N.B. The !Boot in the !VKiller directory has itself been innoculated
      to prevent infection of its own directory.]

Once the icon bar icon appears you may press the middle button to get the
usual Info and Quit options and the left or right button to display the
VKiller dialogue box. When VKiller is first installed, it checks for the
existence of any virus located in the RMA. If found, it will kill it if
possible and warn you of the fact. The Execution/Decrement/Infection Count for
the virus will also be displayed where appropriate. From then on, whenever an
application is started with either a null task name (Extend Virus) or the
"TaskManager" task name (Vigay Virus) the RMA is re-scanned for the offending
virus. The OS_File vector is also constantly monitored for signs of an
ArchieVirus infection.

The dialogue box has the following options...

Filing System:
Click on the right arrow with any mouse button to pop up a menu. This will
allow you to select the filing system you wish to scan. Thanks to the enormous
efforts of Philip Colmer, V2.20 onwards now supports Econet and NFS.
If the user spitefully *RMKills the currently selected filing system, then a
warning dialogue box will be displayed and the next available FS will be
selected instead. If no scannable FSs are available, then VKiller will display
a fatal error dialogue box and quit.

Device: (earlier versions of VKiller called this the "Drive")
Again, click on the right arrow to pop up a menu: this lets you select the
device (usually numbered from 0 for FileCore systems).

Files scanned:
This displays how many files (excluding directories, which aren't files of
course !) have been scanned for this particular device. The count is reset
to zero every time a new scan is started.

Dirs scanned:
This displays how many directories (including recursively nested ones) have
been scanned for this particular device. The count is reset to zero every time
a new scan is started.

Dir scan:
This line displays which directory the Drive Scan has reached so far. The only
exception to this is when it is used to display the appropriate count
when a virus is found. The path displayed is relative to the "root"
directory of the current device, so usually starts with a "$" or "&". If the
path length exceeds the width of the icon for the path text, the end of the
path, preceded by an ellipsis ("...") will be shown instead.

Status:
General brief messages are displayed here. This includes OS_GBPB errors
encountered during a scan (e.g. Drive empty, Disc fault).

The next four fields are self-explanatory and are counters for the number
of times the a virus was encountered in RMA or on disk, the number of
new innoculations and the number of Drive Scans so far (this latter figure
is only incremented when a FULL scan is performed right to the end).

Start scan:
Clicking on this will start a Drive Scan (and the highlighted button label
becomes "Stop Drive Scan"). It may be stopped at any time by clicking on the
(relabelled) button again, but this does not increment the Drive Scan counter.

Innoculate during scan:
Clicking on this will toggle the option to innoculate ALL !Boot files with the
Obey (&FEB) filetype and ALL executables encountered during the scan. If it is
not selected, then any !Boot or executable files infected with one of the
viruses will still be innoculated anyway.

Create log file:
Clicking on this will toggle the option to create a log file. However, you
are only advised to enable this option if:

1. VKiller is installed on a hard disk or you have a RAM disk with at least
   32K free. If you don't meet either of those criteria, then the log file
   will be created on floppy (<VKiller$Dir> to be exact) and may lead to
   excessive disk activity.

2. You have "seen" an editor such as !Edit, because the log file is loaded into
   an editor if one is available. If an editor is unavailable, a simple static
   output window will appear and the text will inevitably scroll off the screen
   before you have a chance to read it !

The Application Icon
--------------------

This is the icon/text located in the top-right hand corner of the VKiller
dialogue box. When VKiller is first loaded, the icon will match VKiller's
Filer icon (the text will say "Idle" indicating that no scan is in progress).
When a scan is started, the following rules are obeyed as to the update of
the icon:

* If the directory name begins with an "!" character, then
  either:
    1) display the application icon if it is present in RMA already
       (e.g. by opening a Filer window, which caches the icons)
    2) display the standard Archimedes "application" icon if it isn't in RMA

* If the directory name, doesn't begin with an "!", then just display the
  standard Archimedes "directory" icon.

At the end of the scan, the icon will return to its original VKiller Filer
icon state (and the "Idle" text will reappear).

Notes about the Drive Scan
--------------------------

The Drive Scan is fully multi-tasking and the VKiller dialogue box does NOT
need to be open during the scan. If the dialogue box is closed during a scan,
then it will be automatically re-opened (or brought to the front if it is
already open) when an infection is found or the Drive Scan has finished.

If the system is infected mid-way through a Drive Scan, then any virus module
will be automatically killed and the dialogue box will be re-opened (as it
would be if a virus module was run at any time) with a suitable message. At
the end of that Drive Scan, you are advised that the drive may still be
infected, in which case you should re-scan that drive (and the drive that
caused the infection in the first place).

There are a couple of things to note here:

* !Boot (Obey) files longer than 5K will be skipped (a message is displayed).
* VKiller requires 1K of RMA per directory level (a failed RMA claim will cause
  that dir to be skipped).

Request For Viruses
-------------------

Yes, this is a strange thing to ask, but could people in possession of a virus
please send it to the address at the end of this document ? Please mark the
disc (or e-mail !) clearly that it contains a virus. I would like VKiller to
evolve to cope with other viruses (I know that there a few others floating
around, so I'd appreciate anyone's assistance in tracking them down).

Future Enhancements to VKiller
------------------------------                               

* Find a way to get a task handle given that task's name (this will make the
  RMKilling of the Extend Virus module a lot safer from the Desktop).

* Add support for killing (or innoculating against) other viruses. This is
  a never-ending task :-(

* Find a way to get the list of routines that have currently claimed a vector.
  This appears to be impossible to accomplish (OK, impossible OFFICIALLY) under
  RISC OS 2.00.

* Allow a file or directory to be dragged onto the dialogue box for analysis.

* Add an option to REMOVE innoculation (some executables may check their own
  length and complain for instance).

Where to send your viruses, bug reports, fixes, enhancements etc.
-----------------------------------------------------------------

Snail Mail:             JANET e-mail:

Richard K. Lloyd,       rkl@uk.ac.liv.cs.and
1, Banks Road,
Lower Heswall,
Wirral,
Merseyside,
Great Britain
L60 9JS
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*
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00003210  69 6c 6c 65 72 0a 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |iller.----------|
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00003230  2d 2d 2d 2d 20 20 20 20  20 20 20 20 20 20 20 20  |----            |
00003240  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
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000033f0  52 49 53 43 20 4f 53 20  32 2e 30 30 2e 0a 0a 2a  |RISC OS 2.00...*|
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00003450  41 64 64 20 61 6e 20 6f  70 74 69 6f 6e 20 74 6f  |Add an option to|
00003460  20 52 45 4d 4f 56 45 20  69 6e 6e 6f 63 75 6c 61  | REMOVE innocula|
00003470  74 69 6f 6e 20 28 73 6f  6d 65 20 65 78 65 63 75  |tion (some execu|
00003480  74 61 62 6c 65 73 20 6d  61 79 20 63 68 65 63 6b  |tables may check|
00003490  20 74 68 65 69 72 20 6f  77 6e 0a 20 20 6c 65 6e  | their own.  len|
000034a0  67 74 68 20 61 6e 64 20  63 6f 6d 70 6c 61 69 6e  |gth and complain|
000034b0  20 66 6f 72 20 69 6e 73  74 61 6e 63 65 29 2e 0a  | for instance)..|
000034c0  0a 57 68 65 72 65 20 74  6f 20 73 65 6e 64 20 79  |.Where to send y|
000034d0  6f 75 72 20 76 69 72 75  73 65 73 2c 20 62 75 67  |our viruses, bug|
000034e0  20 72 65 70 6f 72 74 73  2c 20 66 69 78 65 73 2c  | reports, fixes,|
000034f0  20 65 6e 68 61 6e 63 65  6d 65 6e 74 73 20 65 74  | enhancements et|
00003500  63 2e 0a 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |c..-------------|
00003510  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003540  2d 2d 2d 2d 0a 0a 53 6e  61 69 6c 20 4d 61 69 6c  |----..Snail Mail|
00003550  3a 20 20 20 20 20 20 20  20 20 20 20 20 20 4a 41  |:             JA|
00003560  4e 45 54 20 65 2d 6d 61  69 6c 3a 0a 0a 52 69 63  |NET e-mail:..Ric|
00003570  68 61 72 64 20 4b 2e 20  4c 6c 6f 79 64 2c 20 20  |hard K. Lloyd,  |
00003580  20 20 20 20 20 72 6b 6c  40 75 6b 2e 61 63 2e 6c  |     rkl@uk.ac.l|
00003590  69 76 2e 63 73 2e 61 6e  64 0a 31 2c 20 42 61 6e  |iv.cs.and.1, Ban|
000035a0  6b 73 20 52 6f 61 64 2c  0a 4c 6f 77 65 72 20 48  |ks Road,.Lower H|
000035b0  65 73 77 61 6c 6c 2c 0a  57 69 72 72 61 6c 2c 0a  |eswall,.Wirral,.|
000035c0  4d 65 72 73 65 79 73 69  64 65 2c 0a 47 72 65 61  |Merseyside,.Grea|
000035d0  74 20 42 72 69 74 61 69  6e 0a 4c 36 30 20 39 4a  |t Britain.L60 9J|
000035e0  53 0a                                             |S.|
000035e2