Threat Description

Numgame

Details

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

Summary



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



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



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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