Summary

Bropia.C is a minor variant of Bropia.A. It uses MSN messenger for spreading by sending itself as "LOL.scr", "Webcam.pif", "hahahaha.pif", "me_2005.pif" or "sister.pif". It also drops a variant of Rbot on the infected computer.

Additional Details

When run, the worm checks files

 
 
 winexec32.exe
 adaware32.exe
 VB6.EXE
 iexplore.exe

If these files are not found, it drops file "cz.exe" and executes it. This file is a variant of Rbot which is detected generically by FSAV. Brobia.C can also disable mouse right button.

MSN spreading

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

 
 
 LOL.scr
 Webcam.pif
 hahahaha.pif
 me_2005.pif
 sister.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.

Detection

F-Secure Anti-Virus detects Brobia.C with the following update: [FSAV_Database_Version] Version=2005-01-26_01

Technical Details: Jarkko Turkulainen, Jan 26th, 2005; F-Secure Corporation