Virus Profile: VBS/LoveLetter.bi

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 9/20/2000
Date Added: 9/20/2000
Origin: USA
Length: 4,976
Type: Virus
Subtype: Internet Worm
DAT Required: 4097
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

On the first of the month a dialog box titled "VBS/Party" appears with the message "Hey!!.. Cloze the doorz coz we gonna party in 'ere ALL nite!! ;-)". The existence of the previously mentioned files.

Methods of Infection

This worm uses Windows Scripting Host to write a .VBS file to the local machine, and then MAPI email Outlook to send email messages to entries listed in the Windows Address Book and mIRC to send to connected IRC channels.

Aliases

IRC/LoveLetter.bi, VBS/Party
   

Virus Characteristics

This is a VBScript Internet worm that travels via Outlook and mIRC. This worm may arrive by email with this detail:

Subject="Party Time"
Body="Hey!!.. Cloze the doorz coz we gonna party in 'ere all nite!! ;-)
Sweet demo coded in Visual Basic.. unleash the powerz of Mickey$oft!
Enjoy :-)"
Attachments="Party.BAS.vbs"

Opening the attachment infects systems which support Windows Scripting Host.

The worm makes the following changes:
- Changes the reported Windows version to "Mickey$oft Windowz v0.3"
- Changes the registered owner to "SiR DySTyK"
- Changes the registered organization to "VBS/Party"
- Creates the "PARTY0" sub directory in the Windows System directory and writes "PARTY1.vbs", "PARTY2.VBS", ... "PARTY50.VBS to it".
- Creates "C:\WINDOWS\START MENU\PROGRAMS\STARTUP\WINMGR.LNK.VBS" and "C:\WINDOWS\SYSTEM\PARTY.BAS.VBS"
- Overwrites "C:\MIRC\SCRIPT.INI" to automatically send itself out over mIRC.

Variants

Variants information
Virus Name Type Subtype Differences
VBS/Loveletter.bk Virus VBScript worm Posted to newsgroup, minor text change
   
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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