Trojan-Clicker.Win32.GreatPage

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 will periodically load a designated web page in the Internet browser. It is a Windows PE EXE file. The executable file is 36 864 bytes in size. It is written in Visual C++.

Payload

Once launched, the Trojan copies itself to the Windows system directory as "winsvc32.exe":

It then registers this file in the system registry:

This ensures that the Trojan will be launched each time Windows is booted on the victim machine.

Every 30 minutes, the Trojan will open http://www.greatpage.da.ru using the Windows command line.

At the time of writing, no page was placed on this address.

Removal instructions

1. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
2. Delete the following file:
   %System%winsvc32.exe
3. Delete the following system registry entry:
   [HKCUSoftwareMicrosoftWindowsCurrentVersionRun]
   "winsvc32.exe" = "%System%winsvc32.exe"
4. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

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