F-Secure Virus Descriptions : Bropia.F
[Summary] | [Detailed Description] | [Detection]
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.
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.
F-Secure Anti-Virus detects Brobia.F with the following update:
[FSAV_Database_Version]
Version=2005-02-03_01
Technical Details:
Jarkko Turkulainen, Feb 03rd, 2005;
F-Secure Corporation
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