The Toothless virus

 


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  Vesselin Bontchev reported in May 1990:


  The Toothless virus (V534) - Listed as: W13-534

  ===============================================


  This virus came from the Soviet Union and is probably created there.

  I have a Russian program against it. In the accompanying

  documentation the virus is called "a version of the 648 (Vienna)

  virus, made by a clumsy programmer". This definition is quite exact.

  The virus is really very similar to the Vienna one, with some parts

  of code removed and other slightly changed.  It is a non-resident

  virus. It infects only .COM files in the current and in the root

  directory.  The directories, listed in the PATH variable are *not*

  searched - the code for finding this variable in the environment is

  entirely removed.  The destructive function is also removed.  The

  infected files are marked not with a 62 seconds mark in their time

  of last update. Instead, a month equal to 13 in the date of last

  update is used. This is rather boring, since it can be easily seen

  (by obtaining a directory listing) and some programs (e.g., Norton

  Utilities) treat such things as "not a proper directory entry".  The

  virus increases the length of the infected files by 534 bytes.  Only

  files with length between 256 and 64000 bytes are attacked (the

  first of these numbers was 10 in the Vienna virus).  The virus is

  not very virulent - I have only one report about it.  The man who

  reported it brought me an infected COMMAND.COM and said that its

  length had changed once a bit - "about 500 bytes" - and the month in

  the file date has changed to 13.  When I was able to confirm that

  this is indeed a new virus, I checked all his files, but found

  nothing more than that infected COMMAND.COM.


  If the virus infects a file with the ReadOnly attribute set, this

  attribute is cleared after the infection. This is due to a bug in

  the virus code.


  The virus is assembled with a strange assembler (A86?).  Its

  disassembly listing cannot be assembled back with MASM or TASM to

  produce exactly the same code.



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