Trojan-Downloader.Win32.VB.bqz

Technical Details

This Trojan downloads other files via the Internet and launches them for execution on the victim machine without the user’s knowledge or consent. It is a Windows PE EXE file. It is 31744 bytes in size. It is written in Visual Basic.

Installation

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

In order to ensure that the Trojan is launched automatically each time the system is booted, the Trojan adds a link to its executable file in the system registry:

Payload

The Trojan launches Internet Explorer and injects into it code which downloads a file from the following links:

These files will be saved to the Windows system directory:

The downloaded files will then be launched for execution.

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 following system registry key parameter:
   [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   "wdfmgrnt" = "%System%\wdfmgrnt.exe"
4. Delete the following files:
   %System%\wdfmgrnt.exe
   %System%\t21.exe
   %System%\10050.exe
5. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).