FRISK Software International


Summary of W32/Mitglieder.GV
Discovered: 15 Dec 2005
Definition files: 15 Dec 2005
Risk Level: Medium
Distribution:Medium
 
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Brief description
Technical description
Removal Instructions

Brief Description
Mitglieder.GV is a downloader trojan. It's incapable of spreading itself. It modifies registry to make sure it's run at startup. It runs in an endless loop trying to download files from multiple locations on the internet. If it manages to download any, they are executed.


Technical Description
When first run Mitglieder.GB copies itself to %WINDIR%\system32\anti_troj.exe and drops the file ntimage.gif to the same directory. It opens Internet Explorer to view the gif picture. The picture looks like this:



It adds the value:

"anti_troj"="%WINDIR%\system32\anti_troj.exe"

to the keys:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

and the as value:

"FirstRRRun"=1

to the key:

[HKEY_CURRENT_USER\Software\FirstRRRun]

as an infection marker.

The trojan runs in an endless loop checking if the infected computer is connected to the internet and if so, tries to download a file named a.php from multiple URLs. It creates directory %WINDIR%\exefld and downloads the file there under a random name. If a file is downloaded then it's executed.


Removal Instructions
For general removal instructions please click here.

Marteinn Žór Haršarson
 


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Authentium

perComp Verlag
(in German)
 

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