Threat Descriptions

VBSWG.Q@mm

Classification

Category :

Malware

Type :

Worm

Platform :

VBS

Aliases :

VBSWG.Q@mm

Summary

At February 16th, a variant of VBS/VBSWG was spreading within messages that have the following content: 

Subject:

Info Reformasi

 Body: Maklumat Terkini...

 Attachment: r4mac.vbs

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

When the attached file is executed, the worm will mail itself to the each recipient in every address book. After mass mailing the following key is added to the registry: 

HKEY_CURRENT_USER\software\Reformasi\mailed

This variant also replicates using mIRC and Pirch IRC clients. It replaces the "script.ini" from mIRC and "events.ini" from Pirch installation directories, causing that the worm will send itself to the IRC user that joins the channel where an infected user is.

VBSWG.Q also goes trough all local and network drivers from the system, and replaces every file with either ".vbs" or ".vbe" extension with itself. It also attempts to locate mIRC and Pirch installations from these drives.

This variant activates its payload at September 7th, when it launches a web browser and connects to Malaysian web site.

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