Summary

Bropia.J is a minor variant of Bropia.G worm. Like the previous variants, it uses MSN messenger for spreading. It also drops a variant of Rbot on the infected system.

Additional Details

When run, the worm checks for files

 
 
 win32s.exe
 winis.exe
 svchosts.exe
 iexplore.exe

This check is made to prevent the worm for installing it again on infected system. If the files are not found, it drops file "exe.exe" and executes it. This file is a variant of Rbot. The bot can be used as a backdoor, collecting system information, logging keystrokes, relaying spam and for various other purposes. Brobia.J also drops a file "pic.jpg" and opens it. On default installation of Windows, the program associated with jpg-extension is usually Internet Explorer. The picture presents a woman in light clothing.

MSN spreading

The worm attempts to send one of the following messages to MSN Messenger contacts:

 
 
 LOOK!  <URL to worm> :-O
 paris hilton got hacked!! <URL to worm> :D
 Huge Turd hahaah!  <URL to worm> :P
 nice! <URL to worm> :P
 ownage! <URL to worm> :D

Where <URL to worm> is a http-link to worm's file. Possible file names in the URLs are

 
 
 scary.pif
 paris-hilton.pif
 massive-turd.pif
 sexy-pitch.pif
 w00t!.pif
 FUNNY-SHIT!.pif

The links are static addresses. At the time of this writing, the files has been removed from the servers.

Detection

F-Secure Anti-Virus detects Brobia.J with the following update: [FSAV_Database_Version] Version=2005-02-22_01

Technical Details: Jarkko Turkulainen, Feb 22rd, 2005; F-Secure Corporation