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WM/CVCK1.B;E

This page shows details and results of our analysis on the malware WM/CVCK1.B;E

Threat Detail

Malware Type: Virus

Malware Sub-type: Macro

Discovery Date: 1997-05-01

Next Steps:

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.


Minimum DAT

4002 (1998-12-02)

Updated DAT

4002 (1998-12-02)

 Minimum Engine

5.1.00

File Length

Not Applicable

 Description Added

1997-05-15

Description Modified

1997-05-15

Malware Proliferation

Characteristics

This virus propagates by infecting Word Documents in Microsoft WORD Versions 6.x / 7.x on Windows and Macintosh platforms. The virus consists of these macros:

ACTION, ACTIONDATE, AUTOEXEC, AUTOOPEN, EDITAUTOTEXT, FILEPRINT, FILEPRINTDEFAULT, FILETEMPLATES, STDCLOSE, TOOLSMACRO

in an infected document. Their names change to:

ACTION, ACTIONDATE, AUTOCLOSE, DEFEATAV, EDITAUTOTEXT, FILEPRINT, FILEPRINTDEFAULT, FILETEMPLATES, STDOPEN, TOOLSMACRO

in Word's Global Template NORMAL.DOT. The virus becomes active by using Auto- and SystemMacros. All macros are encrypted using the standard Word execute-only feature, which means that the user is unable to edit or view the macro code.

Symptoms

On an infected system the virus hides the FILE|TEMPLATES, TOOLS|MACRO, and TOOLS|CUSTOMIZE functionality. Warning: It is important not to use these commands, as you will execute the viral code. If the TOOLS|MACRO command is used a 'Microsoft Word Err=1022' MessageBox will be displayed and Word will quit because of a mistake in coding. If the user opens a file on the 1st or the 13th the same error message is displayed.

On the first infection a mistake in coding causes a 'WordBasic Err=102' MessageBox to be displayed.

Method of Infection

General Macro Virus Information

Removal

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

SCANPM /ADL /CLEAN /ALL

Additional Windows ME/XP removal considerations


Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* 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 .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

Variants

WM/CVCK1.B
WM/CVCK1.E

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