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Virus Profile: W97M/Melissa.o@mm

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 11/11/1999
Date Added: 11/16/1999
Origin: N/A
Length: N/A
Type: Virus
Subtype: Macro
DAT Required: 4054
Removal Instructions
   
 
 
   

Description

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

Macro warning if opening infected document, increase in size to global template. Email propagation as mentioned above.

Methods of Infection

Opening infected documents will infect global template normal.dot thereby infected any documents used on the system.
   

Virus Family Statistics (over the past 30 days)

Family Statistics information
Virus Name Infected Files Scanned Files % Infected Computers
W97M/Melissa.o@MM 41 204974 0.00

Virus Characteristics

This is a virus for Word 97 documents. It is able to replicate under the SR-1 release of Word 97. It will turn off the macro warning feature of Word 97. This virus consists of a module called "x". It is a copy-cat of the W97M/Melissa.a virus in that there is a payload to send the infected file via MS Outlook.

This virus hooks the system event of closing documents Word97 by the subroutine "Document_Close" (in the global template) thereby running its code. Infected documents contain the subroutine "Document_Open" which also is a system event.

The Outlook email routine which is designed to create an email message with the first 100 recipients with the subject of the message is "Duhalde Presidente " (Office97 User Name) and the body of the message is "Programa de gobierno 1999 - 2004."

   
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.

   

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