McAfee > Theat Center > Virus Detail Page

Overview

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.

Characteristics

This threat is detected as VBS/Calma.  On opening the infected VBScript, the virus copies the file Cz0_32.dll.vbs to the windows directory.   It then creates the file Autoexec.bat in the working directory, which contains instructions to rename *.res files found in the windows SYSTEM directory to *.vbs extension.  It will also delete the following files:

• c:\*.log
• c:\*.dll
• c:\*.sam
• c:\*.bkp

c:\Autoexec.nt will be overwritten with the same above instructions.  Both of these files are detected as VBS/Calma.  The following registry keys will be created:

• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
  CurrentVersion\ Run "basi32.dll"  [windows directory]\Cz0_32.dll.vbs
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Start Page"   __Proximamente...__
•  HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Window Title"  !...Ca0zs...!
• HKEY_LOCAL_MACHINE\Software\kazaa\Transfer "DlDir0"
  [windows directory]\kazaa\

A new folder named \kazaa will be created in the windows directory.  In this directory, the file web.html is created.  This file is detected as VBS/Calma.  Inside this .html file, a VBScript will delete the following folders:

• C:\Progra~1\norton~1
• C:\Progra~1\mcafee
• C:\Progra~1\kasper~1
• C:\Progra~1\trojan~1
• C:\Archiv~1\norton~1
• C:\Progra~1\norton~1
• C:\Archiv~1\mcafee
• C:\Archiv~1\kasper~1
• C:\Archiv~1\trojan~1

It may also create the file \exe.vbs in the windows directory, which contains the infected script.  The following messages are then displayed:

 

 

Symptoms

The presence of the file Cz0_32.dll.vbs and the above registry changes.

Method of Infection

Executing the infected script.

Removal

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

* 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.

Variants

Variants

N/A

All Information

Overview -

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.

Characteristics

Characteristics -

This threat is detected as VBS/Calma.  On opening the infected VBScript, the virus copies the file Cz0_32.dll.vbs to the windows directory.   It then creates the file Autoexec.bat in the working directory, which contains instructions to rename *.res files found in the windows SYSTEM directory to *.vbs extension.  It will also delete the following files:

• c:\*.log
• c:\*.dll
• c:\*.sam
• c:\*.bkp

c:\Autoexec.nt will be overwritten with the same above instructions.  Both of these files are detected as VBS/Calma.  The following registry keys will be created:

• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
  CurrentVersion\ Run "basi32.dll"  [windows directory]\Cz0_32.dll.vbs
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Start Page"   __Proximamente...__
•  HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Window Title"  !...Ca0zs...!
• HKEY_LOCAL_MACHINE\Software\kazaa\Transfer "DlDir0"
  [windows directory]\kazaa\

A new folder named \kazaa will be created in the windows directory.  In this directory, the file web.html is created.  This file is detected as VBS/Calma.  Inside this .html file, a VBScript will delete the following folders:

• C:\Progra~1\norton~1
• C:\Progra~1\mcafee
• C:\Progra~1\kasper~1
• C:\Progra~1\trojan~1
• C:\Archiv~1\norton~1
• C:\Progra~1\norton~1
• C:\Archiv~1\mcafee
• C:\Archiv~1\kasper~1
• C:\Archiv~1\trojan~1

It may also create the file \exe.vbs in the windows directory, which contains the infected script.  The following messages are then displayed:

 

 

Symptoms

Symptoms -

The presence of the file Cz0_32.dll.vbs and the above registry changes.

Method of Infection

Method of Infection -

Executing the infected script.

Removal -

Removal -

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

* 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.

Variants

Variants -

N/A