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Bropia.F

Classification

Category: Malware

Type: Worm

Aliases: Bropia.F, W32/Bropia.F, IM-Worm.Win32.Exir.a

Summary


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

Removal


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details


When run, the worm copies itself as "msnus.exe" in the Windows system directory. Then it checks files:

winhost.exe
winis.exe
dnsserv.exe

If these files are not found, it drops file "cz.exe" and executes it. This file is a variant of Rbot. When "cz.exe" is run, it copies itself as "winhost.exe" in the Windows system directory and adds the following registry keys:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
"win32" = "%SysDir%\winhost.exe"

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.F also drops a file "sexy.jpg" and opens it. On default installation of Windows, the program associated with jpg-extension is usually Internet Explorer. When opened with Internet Explorer, the picture looks like this:

MSN spreading

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

LOL.scr
Webcam.pif
bedroom-thongs.pif
naked_drunk.pif
LMAO.pif
ROFL.pif
underware.pif
Hot.pif
new_webcam.pif

Then it attempts to send this file using MSN messenger to all active MSN contacts. The recipient has to accept and open the file to get infected by the worm.