Trojan-Clicker.Win32.Mobs

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Clicker

Programs classified as Trojan-Clicker are designed to access Internet resources (usually web pages). This is done either by sending appropriate commands to the browser or by replacing system files that provide “standard” addresses for Internet resources (such as the Windows hosts file). A malicious user may use Trojan-Clicker programs to: increase the number of visits to certain sites in order to boost the number of hits for online ads conduct a DoS (Denial of Service) attack on a particular server lead potential victims to viruses or Trojans.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Technical Details

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:

Payload

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

• [HKCUSoftwareMicrosoftInternet ExplorerMain]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKCU.DEFAULTSoftwareMicrosoftInternet ExplorerMain]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKEY_USERSS-1-5-21-606747145-1060284298-839522115- 1003.DEFAULTSoftwareMicrosoftInternet ExplorerMain]
  "Window Title" = "http://weesnich.de.vu"
  "Start Page" = "Microsuxx"
• [HKEY_USERSS-1-5-21-606747145-1060284298-839522115-1003SoftwareMicrosoftInternet ExplorerMain]
  "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 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:
   • [HKCUSoftwareMicrosoftWindowsCurrentVersionRun]
     "MyApp"="%System32%service.exe"
   • [HKCUSoftwareMicrosoftInternet ExplorerMain]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKCUDEFAULTSoftwareMicrosoftInternet ExplorerMain]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKEY_USERSS-1-5-21-606747145-1060284298-839522115-1003.DEFAULTSoftwareMicrosoftInternet ExplorerMain]
     "Window Title"="http://weesnich.de.vu"
     "Start Page"="Microsuxx"
   • [HKEY_USERSS-1-5-21-606747145-1060284298-839522115-1003SoftwareMicrosoftInternet ExplorerMain]
     "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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