F-Secure Virus Descriptions : Surfrbar
[Summary] | [Detailed Description] | [Detection]
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Surfbar is a Visual Basic Script trojan that drops an executable
file onto C: drive and executes it. It has been spammed in email
messages that use a vulnerability in Internet Explorer to execute
the script automatically.
Surfbar.A is drops the DRG.EXE file onto C: drive and runs it.
The DRG.EXE file attempts to download a file called SURFERBAR.DLL
from Internet and puts it to 'C:\Program Files\' folder with
WIN32.DLL name. Then this file is registered to Windows with the
RegSrv32.exe utlility.
The WIN32.DLL file is an Internet Explorer plugin. It provides
customized search capabilities and can be also classified as an
adware. This adware drops the file called WINSRV32.EXE to
'C:\Program Files\' folder.
The WINSRV32.EXE file stays in memory and every 10 seconds does
the following:
1. Refreshes ITBarLayout value in the following Registry key:
[HKCU\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser]
2. Changes the startup page of IE to: 'www.surferbar.com' website
3. Constantly creates the following Registry key:
[HKCU\Software\Microsoft\Windows\CurrentVersion\runonce]
"win32" = "c:\\program files\\winsrv32.exe"
These actions make it hard to remove the installed adware from a
system, that is why the WINSRV32.EXE file is classified as a
trojan.
The trojan has been spammed in messages that look as follows:
Hey,
How have you been? What have you been doing lately?
Ive just been at home doing nothing :( bored at uni etc.
Anyway's lets catch up soon,
Luv,
You know who ;)
or
Why hello ;)
Whats been happening on your side of the woods?
We haven't been doing much at all really!
Anyways seeya tommorow.
or
Hey,
Want to go to the pub on Saturday?
Last Saturday was a blast!
Let me know!
The message is html formatted and contains a hidden link that is
executed automatically. To do this it uses a vulnerability that
could be fixed with an update available at:
http://www.microsoft.com/technet/security/bulletin/MS03-032.asp
Detection in F-Secure Anti-Virus was published on September 4th,
2003 in update:
[FSAV_Database_Version]
Version=2003-09-04_02
Technical Details:
Katrin Tocheva, Sami Rautiainen, Alexey Podrezov
F-Secure Corporation, 4th of September, 2003
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