W97M/Multi.a

This page shows details and results of our analysis on the malware W97M/Multi.a

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 Engine

5600.1067

File Length

Description Added

2000-09-28

Description Modified

2002-09-18

Malware Proliferation

Characteristics

This virus propagates by infecting Word Documents in Microsoft Word97. The virus consists of a macro, MULTIVIRUS, and two forms USERFORM900 and USERFORM999. When an infected document is opened the virus performs the following tasks:

- Disable Word's macro protection
- Upon initial infection, a message box appears reading, "1".
- On the 25th day of month a message box appears which reads "Il est [current time]". This box will reappear every 2 minutes on that day.
- On January 8th a message box entitled, "Another Year of Survival...", appears which reads, "Hides the program manager".
- On Sunday a message box entitled, "It's Sunday &amp I intend to relax!", appears reading, "Closes current file".
- If the name of the current document is less than 9 characters in length, then a message box entitled "Longer File Names Should Be Used" appears.
- Attempts to count the number of times an infected doc is opened by incrementing a counter written to "Winword8.ini"
- Based on this counter, the 23rd time a document is opened after the initial infection, the status bar is changed to "DOEUNPAD98, V3.0,(c) Maret 1998" which scrolls along the bottom left corner of the screen. The counter is then reset to 1.
- Attempts to count the number of times an infected doc is opened by incrementing a counter written to "Nuclear98.ini"
- Based on this counter, the 12th time a document is printed after the initial infection, this message appears:
"And finally i would like to say"
"STOP ALL FRENCH NUCLEAR TESTING IN THE PACIFIC!"
The counter is then reset to 1.
- When the TOOLS|MACRO|MACROS menu is selected a form is shown containing buttons. When a button is pressed, a message box stating, "Ce programme a ralis une opration illgale et va tre interrompu." appears (translated, this reads "This program carried out an illegal operation and will be stopped."). The same message appears when the TOOLS|MACROS|VISUAL BASIC EDITOR menu is selected.

Symptoms

Microsoft Word functioning as previously mentioned.

Method of Infection

Opening an infected document modifies the global "Normal.dot" template to spread the infection.

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

W97M/Multi.b