Threat Description



Aliases: Bropia.A, IM-Worm.Win32.VB.a
Category: Malware
Type: Worm
Platform: W32


Bropia.A is a worm that uses MSN messenger for spreading by sending itself as "Drunk_lol.pif", "Webcam_004.pif", "sexy_bedroom.pif", "naked_party.pif" or "love_me.pif". It also drops a variant of Rbot on the infected computer.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

Technical Details

When run, the worm checks files

adaware.exe  VB6.EXE  lexplore.exe  Win32.exe  

If these files are not found, it drops file


and executes it. This file is a variant of Rbot. When "oms.exe" is run, it copies itself as "lexplore.exe" and adds the following registry keys:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]  "lexplore" = "lexplore"  [HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices]  "lexplore" = "lexplore"  

This ensures that it will be executed at next system startup. The bot can be used as a backdoor, collecting system information, logging keystrokes, relaying spam and for various other purposes.Brobia.A can also disable mouse right button and manipulate Windows mixer volume settings.

MSN spreading

The worm copies itself in C-directory using one of the following filenames:

Drunk_lol.pif  Webcam_004.pif  sexy_bedroom.pif  naked_party.pif  love_me.pif  

Then it attempts to send this file using MSN messenger to all active MSN contacts. The MSN messenger window has to be open on the infected computer's desktop for this to be successful.


F-Secure Anti-Virus detects Brobia.A with the following update:
Database: 2005-01-20_01

Technical Details:Jarkko Turkulainen, Jan 20th, 2005


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