F-Secure Virus Descriptions : Nowobbler

NAME:

Nowobbler

Nowobbler is a mass mailing worm, written in both JScript and VBScript.

VARIANT: Nowobbler.A

The worm spreads in Outlook messages with:

        Subject:    Fw:important

        Body:       Thought you might be interested in this message,
                    read the attachment for more information

        Attachment: WOBBLER.TXT.VBE
                 or WOBBLER.TXT.JSE

With 1/5 probability the worm sends message in Spanish, without any attachment:

        Subject:    Alma

        Body:       No alucines que te amo,
                    cuando en realidad es solo
                    mi corazon quiin lo hace.
                    Porque como ya sabras,
                    mi corazon no manda en mi vida,
                    si asi lo hiciera
                    mi alma estaria perdida.

When executed, the worm shows the Wobbler hoax text.

Then the worm creates a temporary file with a random name and the extension ".wsc" to the Windows System directory. The file is executed and the worm mass mails itself. This file is deleted after the worm has mass mailed itself.

The worm also copies itself to the root of each network drive.

[Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure, September 2000]