Threat Description

VBSWG.K@mm

Details

Aliases: VBSWG.K@mm, Onthefly.B
Category: Malware
Type: Worm
Platform: VBS

Summary


At February 16th, a variant of VBS/Onthefly is spreading via e-mail messages.



Removal


Automatic action

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

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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



Technical Details


The messages have the following German content:

  Subject:    Neues von Ihrem Internetdienstleister - Robert T. Online informiert     Body:         Sehr geehrter Internetsurfer es hat sich einiges bei uns getan. Die Telekom         kann auch Ihre Internetkosten reduzieren. Wir haben auch fur Sie den         richtigen Tarif...Damit auch Sie sich entscheiden konnen, haben wir eine         ubersicht aller fur Sie relevanter Termine an diese eMail gehangt. Wir sind         Sicher, auch Sie werden Ihren Wunschtarif finden.         Bei fragen stehen wir Ihnen naturlich jederzeit zur Verfugung...         Ihr T-Online Service Team     Attachment: Neue Tarife.txt.vbs  

In English the message subject and body are as follows:

  Subject:    News from your Internetserviceprovider - Robert T. Online informs     Body:         Dear Internetsurfer, several things changed at our side. Telekom can reduce         also your Internet charges. We also have for you the right rate...To be         able to decide, we have attached an overview of the relevant dates to this         mail. We are sure, also you will find your prefered rate.         If you have questions, you can of course contact us...         Your T-Online Service Team  

When the attached file is executed, the worm will mail itself to the each recipient in every address book. After mass mailing have been done, this variant adds the following key to the registry:

  HKEY_CURRENT_USER\software\mailed  

This variant also replicates using mIRC and Pirch IRC clients.

There is also a version that is not encrypted. However, due a bug it does not replicate.

Information about the original VBS/Onthefly.A (also known as I-Worm.Lee.o and VBS/VBSWG) is available at: http://www.F-Secure.com/v-descs/onthefly.shtml





Technical Details:Katrin Tocheva, Mikko Hypponen, Sami Rautiainen, F-Secure; February 2001


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