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.

Aliases

• W97M/Choong

Characteristics

This is a very small class macro virus for Word97 documents and templates, and it does little more than spread from infected file to host system, and then on to other documents used on the machine. This virus will infect systems which have been updated to SR-1 update and higher.

The virus infection is called when opening infected documents due to a system event hooked named "Document_Open".

If day is equal to the month (e.g. Feburary 2, March 3, etc) and MS Office Assistant is installed, this virus changes the Office Assistant to say

"CheeChoong!!" "Have a great CheeChoong..."

Symptoms

Modified Office Assistant on trigger date as mentioned above when opening infected documents, macro warning when opening infected documents on an non-infected system.

Method of Infection

Opening infected documents and allowing the macro to run will directly infect the global template and any document used thereafter.

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:

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

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.

Aliases

• W97M/Choong

Characteristics

Characteristics -

This is a very small class macro virus for Word97 documents and templates, and it does little more than spread from infected file to host system, and then on to other documents used on the machine. This virus will infect systems which have been updated to SR-1 update and higher.

The virus infection is called when opening infected documents due to a system event hooked named "Document_Open".

If day is equal to the month (e.g. Feburary 2, March 3, etc) and MS Office Assistant is installed, this virus changes the Office Assistant to say

"CheeChoong!!" "Have a great CheeChoong..."

Symptoms

Symptoms -

Modified Office Assistant on trigger date as mentioned above when opening infected documents, macro warning when opening infected documents on an non-infected system.

Method of Infection

Method of Infection -

Opening infected documents and allowing the macro to run will directly infect the global template and any document used thereafter.

Removal -

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:

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

Variants -

N/A