Virus Profile: VBS/Sling

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 12/20/2003
Date Added: 12/22/2003
Origin: Unknown
Length: Varies
Type: Virus
Subtype: VbScript
DAT Required: 4311
Removal Instructions


This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.

Indication of Infection

Files with .vbs and .vbe extensions have an increase in file size.

Methods of Infection

Executing the infected VBScript.


VBS.Sling (NAV)

Virus Characteristics

This threat is detected as VBS/Sling.  It is an appending VBScript virus, which appends its viral code to all .vbs and .vbe files found on local and network drives.  The virus will insert 99 blank lines to the end of the .vbs and .vbe files found, and then append the viral code.

If the date is 16th of June or 16th of July, the virus will delete all files found on the system, except for files that have a .vbs or .vbe extension.  

Use current engine and DAT files for detection and removal.

Using File Filtering with WebShield SMTP for WindowsNT(not applicable for Solaris):
Within the Configuration console select content filtering.
Select Add.
Add a Description for the content filter rule such as VBSBlock.
Select Filter on Attachment File name.
Filter on .vbs
Select OK.

Additional Windows ME/XP removal considerations

AVERT Recommended Updates:

* Office2000 Updates

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link.
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information.


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