Trojan-Downloader.Win32.Agent.cvow

Technical Details
Payload
Removal instructions

Technical Details

This Trojan downloads files from the Internet and launches them without the user's knowledge. It is a Windows application (PE EXE file) and is 16 896 bytes in size. It is packed using an unknown packer. The unpacked file is approximately 47 KB in size and is written in C++.

Payload

Once launched, the Trojan carries out the following actions:

• It creates the following system registry keys:

  [HKCU\Software\Mozilla]
  "affid" = "224"
  "subid" = "new"
  

• It downloads a file from the Internet via one of the following links:

  http://dive***ywebgo.cn/setup/ad_64.exe
  http://topd***sion.cn/setup/ad_64.exe
  http://div***ywebgo.cn/setup/setup.exe
  http://to***sion.cn/setup/setup.exe
  

• The downloaded file is saved in the current user's temporary files directory "%Temp%" using a random name. Once downloaded, the file is launched for execution. At the time of writing, these links were inactive.

After this, the Trojan ceases running, at the same time deleting its original file.

Removal instructions

If your computer does not have an antivirus, and is infected by this malicious program, follow the instructions below to delete it:

1. Delete the following system registry keys (see What is a system registry and how do I use it?):

   [HKCU\Software\Mozilla]
   "affid" = "224"
   "subid" = "new"
   

2. Delete the file downloaded by the Trojan in the "%Temp%" directory.
3. Empty the Temporary Internet Files directory, which may contain infected files (see How to delete infected files from Temporary Internet Files folder?).
4. Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).