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Trojan-Clicker.Win32.Mobs

Alert Level :	Medium
Discovered:	Feb 06 2007
Tag:	Trojan   Clickers
Discoverer and Source:	http://www.kaspersky.com/

Malware Behavior and Technical Description

This Trojan opens a range of URLs without the knowledge or consent of the user. It is a Windows PE EXE file. The file is 26,624 bytes in size. It is written in Visual Basic.

Installation

When launched, the Trojan copies its executable file to the Windows system directory:

%System%\service.exe

In order to ensure that the Trojan is launched automatically each time Windows is restarted, the Trojan registers its executable file in the system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"MyApp" = "%System%\service.exe" Payload

The Trojan changes the values of the following system registry keys:

• [HKCU\Software\Microsoft\Internet Explorer\Main]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKCU\.DEFAULT\Software\Microsoft\Internet Explorer\Main]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKEY_USERS\S-1-5-21-606747145-1060284298-839522115- 1003\.DEFAULT\Software\ Microsoft\Internet Explorer\Main]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKEY_USERS\S-1-5-21-606747145-1060284298-839522115-1003\Software\ Microsoft\Internet Explorer\Main]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"

Periodically, the Trojan will open the following links in an Internet Explorer window:

• http://www.countering.de/***2000/click.exe?a200639 1
• http://213.221.***.59/in.php?id=Daniel20gera
• http://213.221.***.42/rankem.cgi?id=daniel20
• http://520009810531-****.bei.t-online.de/index.htm
• http://www.countering.de/***2000/counter.exe?a200639 1

At the time of writing, these links were not working.

Removal Trojan-Clicker.Win32.Mobs instructions:

If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:

1. Use Task Manager to terminate the Trojan process.
2. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
3. Delete the file created by the Trojan:

   %System%\service.exe

4. Delete the following system registry key parameters:
   • [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
     "MyApp"="%System32%\service.exe"
   • [HKCU\Software\Microsoft\Internet Explorer\Main]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKCU\DEFAULT\Software\Microsoft\Internet Explorer\Main]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKEY_USERS\S-1-5-21-606747145-1060284298-839522115-1003\.DEFAULT\Software\Microsoft\Internet Explorer\Main]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKEY_USERS\S-1-5-21-606747145-1060284298-839522115-1003\Software\Microsoft\Internet Explorer\Main]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
5. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

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