Threat Description

Numgame

Details

Category: Malware
Type: Worm
Platform: VBS
Aliases: Numgame, GuessGame, VBS/Numgame

Summary


This is a Visual Basic Script worm that disguises itself as a Valentines Day game.



Removal


Automatic action

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

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

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



Variant:Numgame.A

It is written to spread to all addresses found in Outlook's Contacts folder. It sends e-mail messages that look as follows:

Subject:Are you [User's name] my valentine?
Body:   Hi [User's name] my valentine, remember me? I ain't seen
you in ages! Anyway, check-out and play the attached
guess-the-number-game to guess who I am. See you soon,
bye-bye!
Attachment: GuessGame.html or GuessGame.vbe  

Where the attachment GuessGame.html is previously saved in Desktop, My Documents or Temporary folder. If this file does not exist, Numgame sends another copy of itself (GuessGame.vbe) previously saved in Windows System folder.

The worm shows several message boxes trying to play a game with the infected user.

Numgame searches in particular folders and tries to delete several files from the infected computer and from all network drives.

It also changes the system date to 04-08-1981.

F-Secure Anti Virus currently detects Numgame by the heuristics.





Technical Details:Katrin Tocheva, F-Secure; February 17th, 2002


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