Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: Helloween


This virus doesn't activate, because of an mistake in code (the virus should activate on every Octomber 20th).


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


More information on scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

This virus doesn't contain any destructive routine - it only tries to write the following message:

   Virus napsany specialne pro inzenyra ZAKA ze SPS      *******************      Nepodlehejte panice, mate nakazeno jen par souboru...      (c) 1993 II.A 1988      Tak a ted si vyzkousime treba: RESET      Kdyby kazdy nespokojeny student      napsal virus, tak v nasich skolach by      ani jiny software nekolov      al a McAfee by se divil...  

After this the virus waits for a keypress and then resets the machine.

The 1376 bytes long variant is nearly identical to the Helloween.1839 described above, but it displays this message:

   Nesedte porad u pocitace a zkuste jednou delat neco rozumneho!  *******************        !! Poslouchejte HELLOWEEN - nejlepsi metalovou skupinu !!  

This variant also has a different xor-coding constant, it activates on November 1st when it reboots the machine.

Technical Details:Libor Pechacek,


Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More